Front Panels - Thoughts

rod rodsmallwood52 at
Sun Nov 1 10:58:13 CST 2015

Hi Guys
            Very interesting.  So some did and some did not.
I have just had another thought. I have a whole slew of DEC systems that 
have 80xx or Z80 processors.
and run CP/M . Now nobody is going to hack a desktop case about but 
sneaking a flat cable out the back
or through a drive blanking panel might be a non destructive access system.


On 01/11/15 12:05, Jeff Galinat wrote:
>> On Nov 1, 2015, at 3:13 AM, Brent Hilpert <hilpert at> wrote:
>> The other way round I think, the Altair and IMSAI were the only S100 machines I recall OTTOMH which had blinkenlight panels.
>> The vast majority of them didn't. Northstar & Cromemco as you say, Compu-Pro, Vector-Graphic, Processor Tech SOL, Poly 88, etc. : no blinken.
>> One problem with a front panel on an S100 machine - or any microprocessor-based machine - is getting access to the program counter so you can tell it to start running at some arbitrary address. The Altair/IMSAI panels resolved this with a hack, jamming a jump instruction into the processor data lines (not the S100 bus data lines) via a special connector to a special processor card.
> For the sake of completeness, the other S-100 machines I can think of with a full front panel were the Ithaca Intersystems DPS-1 and some BYT-8 machines.
> Regards,
> Jeff

More information about the cctech mailing list