RE: rex combi card

From: Baltissen, GJPAA (Ruud) (
Date: 2004-08-09 08:55:58

Hallo ATT / L,

> The schematic described so far:
> .....

I have my doubts, to be honest. A 27256 means one can use
2xkernal/2xmodules. This means:

0000-1FFF: Kernal 1
2000-3FFF: Kernal 2
4000-5FFF: Module 1
6000-7FFF: Module 2

A14 is used to tell the EPROM wether to use a module or a Kernal. This
leaves us A13 to choose from one of the Kernals/modules. The problem is that
when choosing Kernal 1, you get Module 1 'for free': there is no way to
combine K1/M2 or K2/M1.

IMHO you are better off with seperate EPROMs for both the Kernal and Module.

But please don't let my critics stop you from inventing other things and
continue the good work !!!

   / __|__
  / /  |_/     Groetjes, Ruud
  \ \__|_\
   \___|        <>


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