From: André Fachat (afachat_at_gmx.de)
Date: 2007-03-19 19:23:27
> 1. I have a 4040 that when powered up the LEDs blink nine times. I
> can't find a flash code table for the 4040 at zimmers.net, but for
> the 8050 it says it is the Common RAM, $4000 - $43FF. Could this be
> the same for the 4040?
I would think so. (also just an educated guess based on the
assumptions that they have similar DOS versions...)
> 2. With a 2031, it powers up correctly but whenever you try to do any
> disk access like get a directory or header a disk, the computer hangs
> until I power off the 2031. I have already swapped the ROMs and the
> 6522, but the problem still persists. I haven't swapped the
> 75160 and/or 75161 yet. Could one of these be the problem and if
> so which one should I swap first? I am trying to minimize any
> desoldering/soldering...
IIRC the 75161 is the control lines driver (ATN, NDAC, ...). This
would be the one that would cause a hang. However, I'd rather
measure the input/output signals to check what's wrong before
unsoldering any other ICs.
André
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