26 Oct
2015
26 Oct
'15
10:09 a.m.
On 10/25/2015 4:37 PM, Adrian Graham wrote:
On 25/10/2015 17:19, "John Robertson"
<jrr at flippers.com> wrote:
It's an MQP Pinmaster48, a 90s-era programmer. As it
happens tonight I got
round to dumping some other EPROMs I had for someone else and one of them
was an SGS2532 which read fine as an MCM2532 so I know the machine works
with that age of chip. All my CBM ones give the same results so I'm assuming
they're dead. Thinking about it there may be some 2532s at work so I can try
burning a PET tester.
I saw the madrigaldesign adapter on Friday but after re-re-remaking the one
I was working on yesterday it was beginning to look a bit rough around the
edges :)
Cheers,
Hi Adrian,
Perhaps one final test for your 2332s is to do a Diode Test on the pins
relative to the ground pin (pin 12) and Vcc pin (24). These should sow
either open or something like 0.6 or higher voltage drop across the pins
- exchange the probes to check both directions.
If your gates all read OK (check between Vcc and GND as well!), then it
might be that the brand of 2332 you have simply draws more current than
your programmer likes. What brand is the PROM? Perhaps it is in one of
our reference book libraries...
If your 2332s are bad, then have you put out a call to see if anyone
else has archived them already?
John :-#)#
--
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
www.flippers.com
"Old pinballers never die, they just flip out"
Hi John
and others,
Thanks for that. I removed the diodes and wired 2332 (21) to 2372 (24)
leaving the A11 swap in place, the programmer complained about pin 18
missing. The adapter in front of me is now wired like this:
2332 (18) to 2372 (21)
2332 (20) 2x diodes to 2372 18 (band) and 20 (band)
2332 (20) 2k2 resistor to 2332 (24)
2332 (21) to 2372 (24)
Now I get "reverse insertion" hinting I've wired something upside-down
which
isn't the case. I can read 27256 and 2764's no problem so I'm mounting
things the correct way.
Further digging into available eproms that the programmer can read reveals
it CAN read 2532s, specifically the MCM2532 which the datasheet tells me has
the same pinout as the 2332. I still get "reverse insertion error" so I'm
guessing my PROMs are toast.
Cheers,
Reverse insertion may just mean you are drawing more current on the /OE
and /CS than expected.
How about this - go back to my original suggestion (no diodes) and this
time add a small resistor to the 2732 pin 18 and Vcc to act as a load.
Try larger resistors if the reader still complains - and try reading
with NO 2332 in the reader (all FFs). Once you can trick the reader into
reading air as highs then try your 2332 again with the working resistor
values for the unused select.
Oh, and what reader are you using? Did you check with the manufacturer
(or archives somewhere - archive.org?) to see if they have a trick for
reading 2532/2332s?