Nostr notes by DosFox

ah youch. Quick coffee run?

2026-10-28T21:18:34Z

In reply to nevent1q…we0t
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ah youch. Quick coffee run?

Anyone else have a day so frustrating that you’re still angry ...

2026-10-28T20:59:43Z

Anyone else have a day so frustrating that you’re still angry several hours later?

I shouldn’t have upgraded to Mac OS 27. It managed to break SO ...

2026-10-27T20:45:35Z

I shouldn’t have upgraded to Mac OS 27. It managed to break SO MUCH STUFF.

My rule of no more computers remains unbroken. As you can see ...

2026-10-25T13:13:37Z

My rule of no more computers remains unbroken. As you can see this is clearly just a cheese wedge with ram, not a computer

ah the second Zilog part is an SIO, so a serial controller. ...

2026-10-15T08:33:24Z

In reply to nevent1q…asau
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ah the second Zilog part is an SIO, so a serial controller.

Almost certainly all of the firmware is in the EPROM that was soldered in!

So a few days ago I managed to win an auction for a literally ...

2026-10-15T08:20:42Z

So a few days ago I managed to win an auction for a literally unheard of Macintosh digitiser

I’ve literally just found that someone backed the software up on the Macintosh repository.

Also take a look at that board - this is the first time I’ve ever seen a completely RAMless Z80 system!

Also bodge wire and deadbug components galore

Does anyone here have a HyperDrive for the Macintosh by any ...

2026-10-08T13:59:27Z

Does anyone here have a HyperDrive for the Macintosh by any chance?

same. My viewpoint is that I really don’t like LLMs and the ...

2026-10-08T12:07:33Z

In reply to nevent1q…w9w7
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same. My viewpoint is that I really don’t like LLMs and the current implication of “AI”.

If I’m going to do anything with this slop, the only way I’ll be able to feel even remotely comfortable with using it is if I completely rip the damn thing apart, and understand precisely how it works.

I would never intentionally use an LLM for anything.

I’m not exactly thrilled with how Claude-tastic this is, but, ...

2026-10-08T11:54:56Z

I’m not exactly thrilled with how Claude-tastic this is, but, there is now a Macintosh II core for the Mister out there.

https://github.com/danifunker/lbmactwo_MiSTer

honestly it’s just frustrating

2026-09-21T17:53:59Z

In reply to nevent1q…ynxe
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honestly it’s just frustrating

I have a feeling I may have been had by Aliexpress. Ordered five ...

2026-09-21T16:06:29Z

I have a feeling I may have been had by Aliexpress.
Ordered five PSRAM ICs, and all of the ones I’ve tested didn’t work.

Checked the original listing and… it’s suspiciously disappeared 😑

“The physical address of the video buffers simulates the NuBus ...

2026-09-09T15:44:34Z

In reply to nevent1q…mlfd
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“The physical address of the video buffers simulates the NuBus address of slot $E on the Macintosh II family.”

(https://leopard-adc.pepas.com/technotes/hw/hw_14.html)

yes I believe that’s normal, the internal video appears to the ...

2026-09-09T15:42:23Z

In reply to nevent1q…jxds
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yes I believe that’s normal, the internal video appears to the system as a nubus video card

I don’t suppose anyone knows where I can buy 64mb of 4x16mb 30 ...

2026-09-05T18:37:15Z

I don’t suppose anyone knows where I can buy 64mb of 4x16mb 30 pin SIMM RAM?

Preferably not from the US 😅

several people have stated they have similar experiences - I mean ...

2026-09-04T17:12:47Z

In reply to nevent1q…2s5w
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several people have stated they have similar experiences - I mean I bought a *modem* which was liquidated before it left the US. So maybe they’re just being very twitchy, and liquidating anything that could be remotely considered ewaste to be on the “safe” side

Nostr event nevent1qqs8clthp8lrxgvtuc6az8w0sdl2j2cnn50kpj5hszm5ceqv9wvq4vgzyqc2pts67pm3m6h8p08nx2zk9ccw4z49gstgw4dsm4vt2l2m4xsqqy2q47k

2026-09-04T16:40:21Z

In reply to nevent1q…hxr7
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https://kotaku.com/trumps-new-e-waste-policy-has-vintage-tech-collectors-anxious-theyll-be-caught-in-the-crossfire-2000722706

I was under the impression this was a change in US legislation, ...

2026-09-04T16:38:53Z

In reply to nevent1q…pmqz
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I was under the impression this was a change in US legislation, not international legislation

it’s unfortunately anything shipped from the US - if it’s ...

2026-09-04T15:43:53Z

In reply to nevent1q…5def
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it’s unfortunately anything shipped from the US - if it’s considered ewaste, then it cannot be exported

PSA. It has been mentioned before by the wonderful TechKnight - ...

2026-09-04T13:34:13Z

PSA. It has been mentioned before by the wonderful TechKnight - but for the love of sanity DO NOT ORDER RETRO TECH FROM THE US.

I’ve just had my first “liquidated” eBay item.

RIP Apple 1200 Modem, the wotsit deemed you to be ewaste.

No idea what I’m going to do with it, but I’ve found a ...

2026-08-30T20:42:14Z

No idea what I’m going to do with it, but I’ve found a Computer C.H.I.P, the “$9 computer” from 2016 or so.

Nostr event nevent1qqsyw5m2wlualltdqxt3q3jdvh5q6rlln27f7enen7ruvs53ef5lm6czyqc2pts67pm3m6h8p08nx2zk9ccw4z49gstgw4dsm4vt2l2m4xsqqujj0q6

2026-08-28T19:21:33Z

I’ve acquired a husband

Holy smokes. Thanks to @npub19ld…7xs6 for the hint. WE HAVE ...

2026-08-17T18:58:34Z

In reply to nevent1q…8num
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Holy smokes. Thanks to SnowFox (npub19ld…7xs6) for the hint.

WE HAVE SIGNS OF LIFE FROM THE OSHINTOSH IIXI

So after several days of looking and investigation - yeah ...

2026-08-12T11:34:23Z

In reply to nevent1q…jduy
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So after several days of looking and investigation - yeah there’s no easy way of fixing this.

Best solution is to build a Rom shim, but that’ll put the project on hold for a few weeks. Damnit.

BUT! With the ROMs removed, the CPU is actually free running!

2026-08-10T10:55:05Z

In reply to nevent1q…ch2h
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BUT! With the ROMs removed, the CPU is actually free running!

Welp. Found a pretty damn big error on my part. Turns out I ...

2026-08-10T10:49:31Z

In reply to nevent1q…u4ak
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Welp. Found a pretty damn big error on my part.

Turns out I messed up the address lines for the ROMs. They’re off by two

This thing is so frustratingly close to being finished. I’m ...

2026-08-08T11:00:50Z

This thing is so frustratingly close to being finished.

I’m just waiting for Royal Mail to actually DELIVER SOME DAMN PACKAGES.

Huh I had a thought. The original OSHintosh would probably make a ...

2026-08-07T17:25:33Z

Huh I had a thought. The original OSHintosh would probably make a good target for the Pistorm.

Apparently I've not posted in a week. Things have been afoot. ...

2026-07-29T19:28:35Z

Apparently I've not posted in a week.

Things have been afoot. Including BOARDS!

This is the OSHintosh IIxi - basically an SE/30 on a single board, with ATX power and VGA out

This is sort of amusing. To get my OSHintosh (open source ...

2026-07-14T17:35:29Z

This is sort of amusing. To get my OSHintosh (open source Macintosh, design is on GitHub) running, one mod that I had to do was to pull up the address lines A9, A10, A11 and A12.

The pull ups were missing on the original Macintosh 128K schematics, but were present on the Macintosh Plus schematics.

As I was working on my 128K yesterday, I spotted this interesting bodge on the logic board.

A 2.2k resistor pack with only four resistors connected to pins on the VIA.

Pins A9, A10, A11 and A12.

I had actually managed to implement the exact same mistake as the original Macintosh, which required a factory bodge!

I think I just found a 40 year old Easter egg. I was looking into ...

2026-07-11T12:05:09Z

I think I just found a 40 year old Easter egg.

I was looking into the Levco Monster Mac, which is an upgrade board for the original Macintosh 128k/512k which adds up to 2mb of ram as well as SCSI.

An interesting feature is that this upgrade doesn't necessarily require Macintosh plus ROMs to work (most expansion cards do, as the original ROMs only work with 512k of ram, and don't have SCSI support).

Fortunately the ROMs for the Levco Monster Mac have been dumped.
https://archive.org/details/levco-monstermac-2mxs-rev-d-proms_202505

I reassembled the ROM from the high and low ROM dumps, looked at the resulting binary with a hex editor and there's a nice little greeting for people poking around the ROM 😂

I've just been told by my parents that our elderly Labrador ...

2026-07-01T10:39:27Z

I've just been told by my parents that our elderly Labrador has just been put to sleep.

She was 15 years old (!), and we had her ever since she was a puppy.

I was the one who took her for walks, fed her, and she always used to sleep on my bed when I lived with my parents.

I feel sad that she is gone, but I know it was for the best. She wasn't in the best health over the last few years.

Sleep well old girl.

I wonder, does anyone know if the microprofessor-ii used an off ...

2026-05-08T20:27:51Z

I wonder, does anyone know if the microprofessor-ii used an off the shelf case, or was it more likely a custom case?

What's the perfect CPU for clone Apple IIs? A 6502 Clone! ...

2026-05-06T21:42:10Z

What's the perfect CPU for clone Apple IIs? A 6502 Clone!

These are CM630Ps - 1:1 Bulgarian clones of the 6502, which were used in the Pravetz series of apple ii clones.

These will be used in my DELTA (apple iie clones) and the TK2000 (MFP-ii clone, which is a clone of a generic apple ii)

My JLCPCB order arrived! Look at this lovely slab of FR4! ...

2026-04-29T18:49:27Z

My JLCPCB order arrived! Look at this lovely slab of FR4!

It's the #OSHintosh, an open source hardware 68000 Macintosh.

On a nice and cheap two layer PCB!

Really beginning to wish I had about a month off from work, so I ...

2026-04-22T20:54:36Z

Really beginning to wish I had about a month off from work, so I could just hammer out creating a YACCintosh clone, as well as tackling a Macintosh ii compatible system.

no reason it shouldn't

2026-03-31T21:42:05Z

In reply to nevent1q…2exr
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no reason it shouldn't

Also cleaned up the FoxSCSI repository a bit!

2026-03-31T21:28:27Z

In reply to nevent1q…t2hw
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Also cleaned up the FoxSCSI repository a bit!

Also you know how I built a terrible Amiga, which in turn became ...

2026-03-31T21:26:45Z

Also you know how I built a terrible Amiga, which in turn became the world's worst Macintosh ii?

Well I turned it into a PCB! But I also added an ADB converter and Macintosh RS232 Serial interface!

It's still terrible, but according to JLCPCB it's 50p per board, and I can run the Atari ST core, the Mac Plus core, or I could actually use it as an Amiga if I really wanted to!

https://github.com/DosFox1/Migatosh

With #MARCHintosh coming to a close, I'm happy to report that ...

2026-03-31T20:25:28Z

With #MARCHintosh coming to a close, I'm happy to report that the OSHintosh has now been released on github!

https://github.com/DosFox1/OSHintosh

I'll let you tell him about the DELTA

2026-03-24T18:40:05Z

In reply to nevent1q…h0cj
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I'll let you tell him about the DELTA

ah hang on the Quapple is a quadlink by quadram, but it's ...

2026-03-24T18:13:36Z

In reply to nevent1q…pr7k
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ah hang on the Quapple is a quadlink by quadram, but it's still an apple ii on an ISA card!

https://github.com/schlae/quapple

2026-03-24T18:10:53Z

In reply to nevent1q…htlv
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https://github.com/schlae/quapple

yep. The Quapple.

2026-03-24T18:10:14Z

In reply to nevent1q…thq8
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yep. The Quapple.

funny you should mention that. Three different people suggested ...

2026-03-20T15:12:40Z

In reply to nevent1q…xcz8
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funny you should mention that. Three different people suggested that to me as well.

I decided against it, as if the apple logo is a no go, something that's referencing the apple logo is a bit too close for comforts.

At least with this "not a Mac" it was drawn free hand by myself!

Alright fineee here's the slightly less risky logo for the ...

2026-03-20T14:48:06Z

Alright fineee here's the slightly less risky logo for the OSHintosh

Maybe I'll design a board to trial this out. I'm almost ...

2026-03-17T22:19:02Z

In reply to nevent1q…xklg
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Maybe I'll design a board to trial this out. I'm almost certainly missing other things that will need to be routed, and it might even necessitate a ROM upgrade to the II to make it think it's a IIx.

SO! By sticking a 68030 down, with a GAL to generate !PAS onto a ...

2026-03-17T22:17:32Z

In reply to nevent1q…4thd
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SO! By sticking a 68030 down, with a GAL to generate !PAS onto a small daughterboard that fits over the 68020 and MMU connector on a Macintosh II, it should be possible to upgrade a Macintosh II into a quasi IIx, allowing you to run A/UX and add more RAM.

In theory!

Looking back at the schematics again, that PAS signal (physical ...

2026-03-17T22:15:57Z

In reply to nevent1q…k0rn
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Looking back at the schematics again, that PAS signal (physical address strobe) is used in a single place - the NuChip (the Nubus controller).

It's also worth noting that by checking the Macintosh II schematics, there are a handful of signals that are handed over to the MMU.

In the IIx, these additional signals are just held high by a few resistor packs, whilst the only signal generated elsewhere is the PAS.

So this equation is specifically as follows: /o19 = /i2 * /i9 + ...

2026-03-17T22:13:56Z

In reply to nevent1q…w2q2
_________________________

So this equation is specifically as follows:

/o19 = /i2 * /i9
+ /i2 * /i8
+ /i2 * /i7

o19.oe = /i11

o19 is the single output, which is supposedly the !PAS signal.

i2 is !AS (address strobe), i7, i8 and i9 are FC2, FC1 and FC0 respectively, and i11 is !BGACK.

All of the inputs are signals directly from the 68030. The !PAS signal is meant to be generated by the 68851 MMU, but instead is generated here.

Probably not. The tech goblin has taken over my brain again.

2026-03-17T22:10:15Z

In reply to nevent1q…2e0y
_________________________

Probably not. The tech goblin has taken over my brain again.

Except... After converting the JEDs to equations, I found that ...

2026-03-17T22:09:28Z

In reply to nevent1q…cxa7
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Except... After converting the JEDs to equations, I found that they basically were identical.

The IIx PAL is only used to generate *a single output* from a handful of inputs.

Comparing it to the PAL used in the IIcx (which has a few other outputs) - we can see that the same equation exists in both the IIcx and the IIx.

This would mean that all I need to do is compare the IIcx schematic to the pinourt of the equation to figure out how Apple adapted the Macintosh ii into the IIx.

Make sense?

The IIcx is basically a crunched down IIx. Sort of. It has a ...

2026-03-17T22:06:59Z

In reply to nevent1q…9988
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The IIcx is basically a crunched down IIx.

Sort of.

It has a single mystery PAL (that has been dumped!), which I was assuming would be identical to the one found in the IIx.

No such luck - they're different

Now this is where things get a bit... Interesting. Theoretically ...

2026-03-17T22:05:58Z

In reply to nevent1q…v6mc
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Now this is where things get a bit... Interesting.

Theoretically replacing the 68020 and MMU with a 68030 is nothing new, there were quite a few accelerators that managed it.

Unfortunately the schematics don't really exist for these accelerators.

Or the IIx.

But we do have enough schematics for the Macintosh ii and the IIcx!

In fact, if you compare the Macintosh ii logic board to the ...

2026-03-17T22:03:14Z

In reply to nevent1q…mq56
_________________________

In fact, if you compare the Macintosh ii logic board to the Macintosh IIx (which replaced the 68020 with a 68030), you'll see that the routing between the two is pretty much identical.

The only real difference is that the 68020 and 68851 have been replaced by a 68030 and a single PAL.

Except what does contain a nearly identical MMU to the 68551? The ...

2026-03-17T22:00:22Z

In reply to nevent1q…0ltw
_________________________

Except what does contain a nearly identical MMU to the 68551?

The 68030.

The only problem is.... The MC68551 is bloody uncommon. At the ...

2026-03-17T21:59:16Z

In reply to nevent1q…ahp7
_________________________

The only problem is.... The MC68551 is bloody uncommon.

At the moment I cannot find any eBay listings for them.

Why do such a thing? Well... Quite simply a standard Macintosh ii ...

2026-03-17T21:56:14Z

In reply to nevent1q…w93a
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Why do such a thing?

Well... Quite simply a standard Macintosh ii doesn't have a "proper" MMU, it has what's effectively a hardware shim - the HMMU.

This can be replaced with an actual Motorola 68851 MMU - which allows it to access more than 8mb of ram (I still have no idea if MODE32 works with an HMMU, I suspect not), and it also allows for A/UX to run.

So I think I've figured out how to add a 68030 to the ...

2026-03-17T21:53:33Z

So I think I've figured out how to add a 68030 to the Macintosh ii, which would replace the 68020 and the HMMU.

Well this is certainly interesting. There is now a verilog semi ...

2026-03-13T18:15:06Z

Well this is certainly interesting. There is now a verilog semi working IWM clone!!

https://github.com/lampmerchant/tashmachine

The sentence "The UKs 2026 entry to Eurovision was fully ...

2026-02-17T09:53:01Z

The sentence "The UKs 2026 entry to Eurovision was fully unimpressed by my Apple Lisa Clone" is certainly a brand new sentence.

It's also absolutely true.

"I wish I had a good project to work on" *Stares at pile ...

2026-02-14T17:15:46Z

"I wish I had a good project to work on"

*Stares at pile of unfinished projects*

"No not like that"

I haven't bought it Yet?

2026-01-21T21:15:25Z

In reply to nevent1q…ylyn
_________________________

I haven't bought it

Yet?

I have just managed to find a literal barn find PDP 11/05 for ...

2026-01-21T21:09:06Z

I have just managed to find a literal barn find PDP 11/05 for £160.

The hell is my life.

So apart from the Macintosh, NuMachine and the TiExplorer - was ...

2026-01-20T22:53:31Z

So apart from the Macintosh, NuMachine and the TiExplorer - was there any other machine that used NuBus as an expansion bus?

many??

2026-01-17T16:03:59Z

In reply to nevent1q…vs6p
_________________________

many??

I'm randomly reminded of that weird time on the Bad ...

2026-01-17T14:41:16Z

I'm randomly reminded of that weird time on the Bad Site™️ (Tw!tter) when the official Adadruit account started blocking everyone who even mentioned them.

What was that all about??

I think you can probably use both - I'll imagine you'll ...

2025-12-10T17:11:05Z

In reply to nevent1q…ujut
_________________________

I think you can probably use both - I'll imagine you'll be ordering enough of both to significantly reduce the cost of both the 16V8 and 22V10

So just as I left, the connector for the experimental PDS RAM ...

2025-11-21T19:10:58Z

So just as I left, the connector for the experimental PDS RAM card arrived.

That's a project I'll have to get back to when I'm home.

Why do I have that need to build a PCB specifically for getting ...

2025-11-07T19:30:37Z

Why do I have that need to build a PCB specifically for getting Rhapsody on it?

alternatively design an RP2040 into the board

2025-10-30T16:31:06Z

In reply to nevent1q…3478
_________________________

alternatively design an RP2040 into the board

yeahhhhh unless you use a micro usb to USB cable and have a ...

2025-10-30T16:30:43Z

In reply to nevent1q…pyh9
_________________________

yeahhhhh unless you use a micro usb to USB cable and have a simple passthrough on the main board

EE horror stories - needing to design an RFID antenna. Without a ...

2025-10-29T14:57:24Z

EE horror stories - needing to design an RFID antenna.

Without a network analyser.

The screen geometry is awful, but the macintosh 512Ke is back in ...

2025-10-27T20:18:57Z

The screen geometry is awful, but the macintosh 512Ke is back in the land of the living after a recap!

I thought the upgrade was a direct result of the video ROM being ...

2025-10-25T09:46:11Z

In reply to nevent1q…llya
_________________________

I thought the upgrade was a direct result of the video ROM being upgraded?

I have a really dumb experiment that I need to check. If you had ...

2025-10-24T13:29:06Z

I have a really dumb experiment that I need to check.

If you had an unenhanced apple iie, and then put a Pico based VGA adapter in - would that support double high resolution graphics?

Logically the answer should be no - the ROMs in an unhanced IIe are missing the ability to drive the video circuitry at that resolution.

Yet the IIe VGA card theoretically intercepts the video data - so there's a slight chance it could work?

should be 338-6503, which is a 65C02 rebadge ...

2025-10-21T21:54:51Z

In reply to nevent1q…zxm9
_________________________

should be 338-6503, which is a 65C02 rebadge (https://www.cpu-world.com/CPUs/650x/Rockwell-338-6503%20(65C02).html)

So that should mean you have an enhanced IIe as well!

on what should be a 6502! Supposedly that's a 65C02 variant?

2025-10-21T21:49:48Z

In reply to nevent1q…hsh3
_________________________

on what should be a 6502!

Supposedly that's a 65C02 variant?

wait does that say 6503?

2025-10-21T21:22:32Z

In reply to nevent1q…8573
_________________________

wait does that say 6503?

cannot tell if that's sarcasm or not 😅

2025-10-11T20:22:51Z

In reply to nevent1q…e8wz
_________________________

cannot tell if that's sarcasm or not 😅

Something I'm intrigued by - and I really should look into - ...

2025-10-11T20:14:33Z

Something I'm intrigued by - and I really should look into - is how difficult it would be to interface modern-ish SRAMs to the SE/30 and other Macintosh ii computers.

According to the memory map, the actual memory is perfectly flat and contiguous from 0x0000 0000 to 0x4000 0000.

Stick some SRAMs to the right address lines, track down the R/W signal from the CPU and the OE from the GLUE (or generate it locally) and call it a day?

I'm sorry?

2025-10-11T20:08:54Z

In reply to nevent1q…tvvm
_________________________

I'm sorry?

I like how my hobby has gone from "I'm interested in ...

2025-10-11T18:33:58Z

I like how my hobby has gone from "I'm interested in Vintage Apple Computers!" To "my hobby is reverse engineering Apple custom ICs"

Nostr event nevent1qqs94kdvh6f8pt5rqassj0uzw26947nncduye2k3ftj9p2yesrqgqpqzyqc2pts67pm3m6h8p08nx2zk9ccw4z49gstgw4dsm4vt2l2m4xsqqw6rul2

2025-09-27T18:53:24Z

TwoOfThem.jpeg

So if someone were to hypothetically design a replacement for the ...

2025-09-22T17:58:05Z

So if someone were to hypothetically design a replacement for the Macintosh SEs BBU - what would be a good name for it?

Well it only took me about a year, but I've finally started ...

2025-08-30T21:49:09Z

Well it only took me about a year, but I've finally started building a Lisa DAC!

As the name suggests, this is an addon card for the Apple Lisa that provides it with Macintosh Style audio output when it's running Mac OS.

It's literally a Z80 SBC on an additional board!

This will bring the total CPU count on the Lisa up to four - 68000 main cpu, 6502 IO controller, COP402 microcontroller for low level hardware and now the Z80 just for sound!

It only took me about two years, but My DEC J11 is actually ...

2025-08-24T10:21:12Z

It only took me about two years, but My DEC J11 is actually running and executing code!

Thanks to @npub1x56…v6yk and @npub1pu6…p73t for helping me ...

2025-08-13T17:46:09Z

In reply to nevent1q…3d93
_________________________

Thanks to Chartreuse (npub1x56…v6yk) and Phil M0OFX (npub1pu6…p73t) for helping me with this 😅

I'm very very happy this worked for the first time! It's ...

2025-08-13T17:43:50Z

I'm very very happy this worked for the first time! It's my first attempt at writing logic equations for a GAL.

It's a pretty simple affair, the outputs (the three LEDs) are latched when the 12 address lines are set to 0x806 (pulled high and low with resistors here, and then the enable line (green button on the fair right) is pulled low.

Currently driven by a 8mhz clock - I should probably check it runs at 16mhz.

Pretty simple - but I'm glad it works!

My main dumb idea is to add a USB floppy drive to a bluescsi, so ...

2025-08-10T14:13:07Z

In reply to nevent1q…znps
_________________________

My main dumb idea is to add a USB floppy drive to a bluescsi, so you could give 1.44mb floppy support to systems that could only access 400/800k disks 😅

I wonder if it'll be possible to add USB host support to the ...

2025-08-10T14:11:40Z

I wonder if it'll be possible to add USB host support to the #Bluescsi.

I.E, adding images onto a USB drive that plugs into the Pico USB port.

if you're literally taking a track from the GPIO to the ...

2025-08-07T15:40:56Z

In reply to nevent1q…n9gl
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if you're literally taking a track from the GPIO to the speaker and then onto ground - the least you can do is get the polarity fucking right

I've seen some bad electronic design in my time - however ...

2025-08-07T15:08:23Z

I've seen some bad electronic design in my time - however this takes the cake.

It's a product with a sound element on it. Originally it was a piezo, but it was swapped for an SMD speaker at some point.

They:
1) didn't add a drive transistor or op amp - literally driven straight from the MCU pin.

2) didn't add a back EMF diode

3) didn't test the thing properly. Instead opting to test each board with a 555 timer running at 5v, with a tester that was literally held together by a rubber band and zip ties

4) got the fucking polarity of the speaker backwards

This thing is utterly ridiculous. It's a wooden Apple Lisa! ...

2025-08-02T22:41:39Z

This thing is utterly ridiculous.
It's a wooden Apple Lisa!

Inside is my second #AppleLisaClone

Well, huh! The guy who made the nanomac (Macintosh Plus on a Tang ...

2025-07-26T21:36:45Z

Well, huh! The guy who made the nanomac (Macintosh Plus on a Tang Nano FPGA) also wrote a MODtracker for 68000 macintoshes!

https://github.com/harbaum/NanoMac/tree/main/NanoMacTracker

I love how the options for Apple Lisa Hard Drives is literally ...

2025-07-26T17:41:36Z

I love how the options for Apple Lisa Hard Drives is literally "spend £220 on an original profile with 5mb of storage" or "build an Arduino based emulator for £10 that can support 20mb LOS or 2gb Mac os hard drive images"

I wonder if any of the ROMs for the 8 bit architecture prototype ...

2025-07-20T20:29:23Z

I wonder if any of the ROMs for the 8 bit architecture prototype Macintoshes have ever appeared online.

I know about the Twiggy Macintosh ROMs - but nothing earlier than that!

I finally got sick of the cards in my #AppleLisaClone rattling ...

2025-07-18T17:37:43Z

I finally got sick of the cards in my #AppleLisaClone rattling around the place, so I laser cut a proper card cage for the chassis. Looks pretty good, and it's fairly sturdy as well!

I suppose there is already the micro:bit, as well as the assorted ...

2025-07-17T19:10:28Z

In reply to nevent1q…kg7p
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I suppose there is already the micro:bit, as well as the assorted variants of Microsoft makecode.

Just completed a small PCB order! One is a redesign of the ...

2025-07-03T12:54:00Z

Just completed a small PCB order!
One is a redesign of the TashTwenty HD20 emulator, so it can fit into a #MacPlusClone (or SE for that matter)

The second is an adapter for my Macintosh PC drive - I've got the SE driver board for it, the drive itself... But not the cable to the DB37 connector.

And finally is a TK2000 minimal power supply!

Apparently I now own a 9 track HP reel to reel tape drive. Shönk ...

2025-06-06T19:07:55Z

Apparently I now own a 9 track HP reel to reel tape drive.

Shönk for scale