Ee?prom burners [Was: Re: CUBIX/6809 updates]
bdwheele at indiana.edu
Wed Dec 14 07:40:36 CST 2005
On Tue, 2005-12-13 at 16:19 -0700, woodelf wrote:
> Brian Wheeler wrote:
> >In college we wire-wrapped a pdp-8. The final was to repair it in 2
> >hours after the instructor had made several changes to either the wire
> >wrappings, chip orientation (hot chips!) or PAL changes. The 2nd
> >semester was wire-wrapping a 6809-based FLEX system.
> Was that the CMOS pdp chip or a TTL designed PDP?
We used a TTL chip for the ALU, and the rest of the logic was
implemented using PAL (or PLD, I don't remember) chips. They're using
FPGAs now: http://www.cs.indiana.edu/classes/b441/lab/
> >That said, the only thing that's really kept me from building machines
> >(heh, besides time and money!) is the lack of an eprom (or eeprom)
> >What do you guys recommend? Are there instructions for PC-driven
> >burners online somewhere that seem reasonable? If not homebuilt, what's
> >a reasonable price for one?
> Use of a EEPROM may be a better idea as I think there are low cost designs
> that hang off the printer port to burn a eeprom. I think commercial
> burners run at
> $399+ but I can't say for sure.
I was leaning towards eeprom, since it seems like we were forever baking
the logic chips to fix our errors in that class...
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