paulrickards on Nostr: I've been pondering another strategy for the Lisa PROMs needed for the ...
I've been pondering another strategy for the Lisa PROMs needed for the #AppleLisaClone project. Could an (E)EPROM be used instead? With the appropriate adapter and fast enough response time, might it work? I think vintage arcade folks do this now. I've successfully used EPROMs before in a #C64 for the PLA.
I have a stash of W27C512 that are 45ns which I think is fast enough to replace a MMI 6309. There would be a lot of wasted space but who cares?
Thoughts?
#RetroComputing
Published at
2023-08-30 16:10:09Event JSON
{
"id": "960b5f2589a3631354031f19630909e7c4838cd544b4bdf2ff5d0dac5dbd4bcc",
"pubkey": "b0a11a6125c511239cd7a0f1ea8c4eea15a57707dfdd9ef57e27cc22f46aea77",
"created_at": 1693411809,
"kind": 1,
"tags": [
[
"e",
"4c66e9af38fad4239d3bedc73967a1cb53b317d5120d07499958a63417a6315f",
"wss://relay.mostr.pub",
"reply"
],
[
"t",
"applelisaclone"
],
[
"t",
"c64"
],
[
"t",
"retrocomputing"
],
[
"proxy",
"https://mastodon.social/users/paulrickards/statuses/110979436371111907",
"activitypub"
]
],
"content": "I've been pondering another strategy for the Lisa PROMs needed for the #AppleLisaClone project. Could an (E)EPROM be used instead? With the appropriate adapter and fast enough response time, might it work? I think vintage arcade folks do this now. I've successfully used EPROMs before in a #C64 for the PLA.\n\nI have a stash of W27C512 that are 45ns which I think is fast enough to replace a MMI 6309. There would be a lot of wasted space but who cares?\n\nThoughts?\n\n#RetroComputing\n\nhttps://files.mastodon.social/media_attachments/files/110/979/423/630/903/451/original/d5396aff2e7ca714.png\n\nhttps://files.mastodon.social/media_attachments/files/110/979/423/661/941/842/original/5a7a56dc7d0204dd.png",
"sig": "2c4152764bd6ccf8d955aeb6941193389dae65a5ae318d5330a9b775286ccbb25289ebe873851bdaf6226bb5399f109d8e3281491d5ed756359886be883ae3aa"
}