14 Dec
2005
14 Dec
'05
1:42 p.m.
On Tue, 2005-12-13 at 22:47 +0000, Dave Dunfield wrote:
Thanks for all of the responses, everyone...I've got lots to think about
(and with christmas being soon, I've got to think fast :)
Brian
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.
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?
Although I have a 29B, I still do most of my "simple" EPROMS (2716-27256)
with a little homebrew burner that I also built back in the 80s. It too is based
on the 6809 (it's can run standlalone with a keypad or controlled via a host).
I have published the design which is available somewhere on my commercial
website if you are interested...
However, I don't know that I would bother, as EPROMS are a pain in the butt
to program due to odd voltages which you must supply/switch - a modern flash
chip will do just as nicely and you can program it with TTL level signals. I did
a very simple flash device programmer via a PC parallel port (uses little adapters
for various flash devices).