14 Dec
2005
14 Dec
'05
1:40 p.m.
On Tue, 2005-12-13 at 16:19 -0700, woodelf wrote:
I was leaning towards eeprom, since it seems like we were forever baking
the logic chips to fix our errors in that class...
Brian
Brian Wheeler wrote:
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/
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?
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)
burner.
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.
>Thanks!
>Brian
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