24008Re: [midatlanticretro] Fun with the Altair 8800
- Jan 8, 2012I have trouble with my DaJEN board in the Altair. I can get to the
prompt but nothing else.
At 10:57 AM 1/8/2012, you wrote:
>--- On Sun, 1/8/12, B Degnan <billdeg@...> wrote:
> > Awesome. I am
> > working with Herb to put that set of code on a 1702 prom to
> > test hos PROLOGUE programmer.
>We burned the code into a 2708 with John's Dajen SCI board plugged
>into the Altair. Now I can swap the RAM out for a Morrow Switchboard
>with the the ROM mapped and run it directly.
>Speaking of which, the Switchboard I have is a *very* early one,
>with no solder mask, and is labeled as Thinker Toys, with a
>copyright date of 1978. There were a lot of very bad modifications
>around the comparators that read the switches, and I've been trying
>to fix it... but it doesn't match the schematics for the common
>Switchboard - John also has a Rev 2 Switchboard, the common blue
>one, and it's rather different. This early one seems to have a
>different switch layout and some other changes in the way it
>addresses the I/O. Does anyone have the docs for this? At the moment
>the only way I can get the ROM enabled is with some jumper wires to
>force it so, with the rest of the board effectively disabled.
>Yahoo! Groups Links
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