homemade computer for fun and experience...

From: Allison J Parent <allisonp_at_world.std.com>
Date: Sat Apr 3 21:47:19 1999

<What might be fun would be an S-100 card to serve as an interface to a
<Monochrome/Hercules equivalent card and an IBM-style keyboard, since these

They do exist! Hercules made cards for the s100 machines that ran DOS!

<Fire). One of those little switch boxes would serve just fine. The 8.0 MH
<Z80 wouldn't be sufficient to drive a VGA, so no need for anything fancy.

Why not? I'm currently planning to use ISA16 and herc video for a z280
system. Z280 has a 16 bit bus mode. The only thing needed to support
herc using a z80 is a MMU to allow mapping the display out of the address
space so that you have room for CP/M. I've done some testing to verify
this will work.

<It could even support two short ISA cards.

More if you buffer the bus!

Allison
Received on Sat Apr 03 1999 - 21:47:19 BST