I just started it up again and here’s what I see. I’m using a ceramic AMD 8088, an OKI 82C84A-5 and a UMI 82C88. I don’t have any pull-ups installed on the pins mentioned below. If I run “MEM” I get an “Unassigned vector CCH” error and it returns to the monitor. I’ve also noticed that it’s not as stable as I remember, and after a few minutes it goes into lala land. I may try the 4.7k pull-ups tonight on the 82C88 and see if that improves things.
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
From: David Fry <dgf...@googlemail.com>
Reply-To: S100-Post <n8vem...@googlegroups.com>
Date: Saturday, April 18, 2015 at 1:54 PM
To: S100-Post <n8vem...@googlegroups.com>
Subject: Re: [N8VEM-S100:6766] Re: S100 8088 CPU Board Crashing/Unstable
you say 'the system is stable without the pull-ups'
Do you mean it is stable when the 8088 has control of the bus ?
did you solve your original problem with the 8088 then ?
regards & thanks
On Saturday, April 18, 2015 at 6:34:40 PM UTC+1, AltairManRich wrote:
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