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Tube❄️Time

pins 3, 4, 5, and 6 appear to have large output driver transistors.
26 February at 2:15 | Open on mastodon.social
7 comments
Tube❄️Time

looks like a perfect match to the MCM14524! unfortunately it is a mask ROM: "This device is ordered as a factory special with its unique pattern specified by the user."
26 February at 2:19 | Open on mastodon.social
Tube❄️Time

how fun, you can specify the memory contents by mailing them four punch cards.
26 February at 2:21 | Open on mastodon.social
Foone🏳️‍⚧️

@tubetime I think Fujitsu (or maybe it was Toshiba?) was later accepting 8mm backup tapes. Handy for the bigger ROMs

26 February at 3:12 | Open on digipres.club
PhDog 🇮🇪
waldi

@tubetime I immediately thought about mask rom. But I thought they changed just the metal layer, and I did not see any difference between cells.

26 February at 10:21 | Open on chaos.social
Tube❄️Time

@waldi this is most likely a diffusion ROM so it would be difficult to see

26 February at 14:55 | Open on mastodon.social
Dustin

@tubetime I learned about factory ROMs but I’ve never used one. Very cool!

26 February at 3:17 | Open on geekdom.social
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