On 06/27/2014 2:31 PM, Rodger Boots wrote: > > Is there > On Jun 27, 2014 1:59 PM, "John Robertson" <jrr@flippers.com > <mailto:jrr@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 :-#)# -- How to subscribe or unsubscribe from TTL http://seven.pairlist.net/mailman/listinfo/techtoolslist _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com http://seven.pairlist.net/mailman/listinfo/techtoolslist FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/