Paul Bigwood wrote:
Lee,
I was very interested in the G Barrow 8080 S100 board octal display
and keypad. A Google search turned up the user manual with cct and
rom code.
Do you mean George Morrow's "Keyed-Up" combination front panel and 8080 CPU board? This one? <>
joshbensadon via Groups.Io wrote:
There is barely enough space for the LED's they're packed in there like
commuters on the 5 O'clock train!
But, you can very easily alternate colours of LED's. I'm using Red and
Yellow, in sets of 4 for HEX.
Nothing stopping you from doing sets of 2,3,3. Might need to count out
the right number of LED's for both layouts.
That's a good idea. :-) The LEDs are evenly spaced, so color could be used to separate them into hex or octal formats. It should be easy to supply enough LEDs so the builder can choose which he wants.
The serial monitor is a little harder. Right now, it's written for hex. But the source is available, so you could change it for octal.
Is it planned to add a SD card for cp/m?
The Z80MC already has it. If you mean the 8080 "Altaid 8800", it doesn't have an SD-card... or for that matter, *any* modern parts. I was aiming for a pure retro-design.
It does have jumper options for bigger modern "bytewide" RAMs and ROMs. In 1976 (the ficticious introduction date), the only options would have been a 2716 2K EPROM and 2K RAM (and they were both very new and expensive).
But as Intel's Gordon Noyce observed, memory chip size doubled every 2 years!
--
ICEs have the same problem as lightbulbs. Why innovate and make
better ones when the current ones burn out often enough to keep
you in business? -- Hunter Cressall
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
Lee Hart