[Techtoolslist] Fluke & Midway 8080 boards...

[John Robertson]

On 06/27/2014 2:31 PM, Rodger Boots wrote:
>
> Is there
> On Jun 27, 2014 1:59 PM, "John Robertson" <jrr at flippers.com 
> <mailto:jrr at flippers.com>> wrote:
> >
> > Hi Andrew,
> >
> > Well, I'm not sure where the problem is at the moment, I don't 
> recall this happening in the past so indeed it could be my 8080 pod 
> that is part of the problem...
> >
> > I did find one cute trick - I have the Kurz Kash fixture and cards 
> for Sea Wolf and while it does allow you to test all the functions the 
> LED lights are difficult to get to light up to make sure that all the 
> driver transistors work. So I put the 8080 pod into Learn mode for 
> 10000h - 1000FFh which is the I/O port for the 8080 and the lights all 
> turn on - at least the lights for the transistors that work...Cute. 
> Otherwise you have to load the the I/O data with 0F or F0 at the 
> correct !/O port address which I haven't gotten around to figuring out 
> yet.
> >
> > Still can't get the high end FFs at addresses FF0h to FFFh to be 
> stable though...
>
> Is there ROM at high addresses? On an 8080 the ROM should be from 0000.
>
By high address I meant 0FFFh, not FFFFh. It was the high end of the ROM 
space which is 0 - 0FFFh in Sea Wolf. The RAM test (2000h - 3FFFh) works 
just fine.

Annoying.

John :-#)#
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