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.
DosFox
npub1xz…hgqe4
2026-03-17 22:15:57 UTC
in reply to nevent1q…k0rn
Author Public Key
npub1xzs2uxhswuw74ecteuejs43wxr4g4f2yz6r4tvxatz6h6kaf5qqqthgqe4Seen on
wss://relay.momostr.pinkPublished at
2026-03-17 22:15:57 UTCEvent JSON
{
"id": "c8851e28415d0e1316a416512537f97e88199b6e773eba29f91a5f2e18ea0029",
"pubkey": "30a0ae1af0771deae70bcf3328562e30ea8aa544168755b0dd58b57d5ba9a000",
"created_at": 1773785757,
"kind": 1,
"tags": [
[
"e",
"4ada0e7179646f50b0f466c1edc3e3dbc910e09d8817954c7bcd1ce0de781ef9",
"",
"root",
"30a0ae1af0771deae70bcf3328562e30ea8aa544168755b0dd58b57d5ba9a000"
],
[
"e",
"cca502db74a742e60fddcf435594c0445ff005e04dbb04b27babbab42724d8b9",
"",
"reply",
"30a0ae1af0771deae70bcf3328562e30ea8aa544168755b0dd58b57d5ba9a000"
],
[
"proxy",
"https://tech.lgbt/@DosFox/116246823398973976",
"web"
],
[
"p",
"30a0ae1af0771deae70bcf3328562e30ea8aa544168755b0dd58b57d5ba9a000"
],
[
"proxy",
"https://tech.lgbt/users/DosFox/statuses/116246823398973976",
"activitypub"
],
[
"L",
"pink.momostr"
],
[
"l",
"pink.momostr.activitypub:https://tech.lgbt/users/DosFox/statuses/116246823398973976",
"pink.momostr"
],
[
"-"
]
],
"content": "Looking back at the schematics again, that PAS signal (physical address strobe) is used in a single place - the NuChip (the Nubus controller).\n\nIt's also worth noting that by checking the Macintosh II schematics, there are a handful of signals that are handed over to the MMU.\n\nIn the IIx, these additional signals are just held high by a few resistor packs, whilst the only signal generated elsewhere is the PAS.",
"sig": "1dc8c7c3a19ec3e4365985643114bcf495bc5a5704bcf874fa6410a83bef745597cf88a4bf2c308d24b37d06a1a174cff07095d6b9499a07bcf7d47a584eeaa5"
}