[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
ProDev DDT16
- Subject: ProDev DDT16
- From: Steven Hirsch <snhirsch@gmail.com>
- Date: Sun, 13 Jul 2008 10:32:38 -0400
- Newsgroups: comp.sys.apple2
- User-agent: Thunderbird 2.0.0.14 (X11/20080502)
- Xref: g2news1.google.com comp.sys.apple2:1582
I recently built one of these from a parts kit purchased several years ago.
Unfortunately, it doesn't work. My assembly skills are expert level and I've
checked the board over under a magnifier several times for bad/unsoldered
connections. The ROM verifies against a known-good binary image. Haven't
tried this on the PALs yet.
Symptoms: Regardless of slot, entering Cn00G simply hangs the host computer.
The monitor sign-on never appears. I've tried both a Rom 1 and Rom 3 IIGS
with no success.
When I dump the slot ROM in the Apple monitor things look correct, so I don't
think the bus interface chips are bad. If I had to guess, it seems to head
south when the CPU bank register is changed.
Does anyone have a suggestion on where to start debugging? I posted on the
A2RetroSystems message board, but I don't think anyone hangs out there.
Steve