Re: Ultimax questions

From: Michał Pleban <>
Date: Sat, 19 Oct 2013 10:38:20 +0200
Message-ID: <>

Rob Clarke wrote:

> I have a working prototype on a breadboard circuit that uses a 6-way
> resetable latch to control the upper 5 address lines of a 1mb eprom,
> which is 31 ultimax images plus the menu system. The setting of the
> latch is gated using one of the i/o lines on the 64 cartridge port
> which, on the max is the /exram line. I completed the menu system which
> seems to work to I just need to fabricate some pcb's which, as I've
> never done it before, is kind of where I ground to a halt in the spring.

You also need a 6116 RAM chip for the MAX BASIC to work. This is where
things get complicated, as it also sits on the /EXRAM line and will
require at least one additional chip to managed.

> Now winter is setting in, i'd like to pick it up again. Anyone
> interested in co-operating to get it finished?

Sure :-)


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