Re: 2001 repair help

From: Francesco Messineo <*francesco.messineo_at_gmail.com*> Date: Wed, 27 Dec 2017 19:36:38 +0100 Message-ID: <CAESs-_xYSyXVcYTNmeHp+5_bQQx0U4Wk1YMUi8r-heUGL=5XRA@mail.gmail.com> · francesco.messineo_at_gmail.com

On Wed, Dec 27, 2017 at 6:45 PM, vossi <vossi@ceffy.de> wrote:
> Hi friends,
> I have a 2001 board that works great, but I have a asterisk at $8200 on the
> screen after startup.

is it really a 2001 (6550 Video RAMs) or a 2001N (2114 video RAMs, 4116 DRAMs)?

> If I poke to $8000 it also changed $8200. I changed the video ram, but that
> has no effect.
> All postions before and after $8200 are ok.
> Any ideas...???

if It's a 2001N, I'd change UF7, or the higher nibble 6550 video RAM
on a real 2001.

HTH
Frank IZ8DWF

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