Re: Homebrew STG card

[Paul Corner <Paul.Corner-at-tesco.net>]

Hi Matt

> The clock inputs (3 for each 8254) need to be
> driven from one of those metal oscillator modules (one module drives all
> three 8254s together), probably at 1MHz. 

You wouldn't use the Bus clock then ?

> I like the idea of DB9
> connectors for the encoders, but this will need to be on the external
> interface board due to space considerations. The digital i/o should probably
> be on a 50 pin (2x25) DIL connector that conforms to the OPTO22 standard so
> that folks who care to can use that interface.

Surely the DB9 connectors could be mounted on the rear of the PC case - 
There's that OPTO22 standard - do you have the current & voltage spec on that.

> > I have a target length of 160mm for this card, 200mm is the most I really
> > want to go. > What's the reason/

The motherboard I have, could then be mounted in a much smaller custom case.

Regards, Paul.