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Early 6502 Article - EDN September 20th 1975
Posted: Mon Jul 12, 2021 9:04 pm
by monsonite
The 6502 was officially launched at the Wescon Trade Fair, San Francisco, September 16th 1975.
Within a few days of the launch the EDN technical department had lashed together a prototype on a breadboard and reviewed the new device. That first article is here:
https://web.archive.org/web/20160424050 ... 5_6502.pdf
Re: Early 6502 Article - EDN September 20th 1975
Posted: Tue Jul 13, 2021 5:22 am
by drogon
The 6502 was officially launched at the Wescon Trade Fair, San Francisco, September 16th 1975.
Within a few days of the launch the EDN technical department had lashed together a prototype on a breadboard and reviewed the new device. That first article is here:
https://web.archive.org/web/20160424050 ... 5_6502.pdf
I liked their initial bring-up testing - their ROM would default to outputs high and they had just one instruction in $FFFF - JMP, so come out of reset, reset vector points to $FFFF, which is JMP .... then the PC wraps to zero and the cpu picks up 2 more $FF's so JMPs back to $FFFF.
-Gordon
Re: Early 6502 Article - EDN September 20th 1975
Posted: Tue Jul 13, 2021 12:05 pm
by BigEd
Even better, this test exercises what they believed to be the critical path!