View Profile: dave_m - Vintage Computer Forum

June 30th, 2020, 08:26 AM

dave_m replied to a thread Lookinmg for Basic programs for PET in Commodore

There are many places. Try http://www.zimmers.net/anonftp/pub/cbm/pet/games/english/index.html If the games use assembly language routines for...

2 replies | 117 view(s)

June 30th, 2020, 07:06 AM

dave_m replied to a thread Commodore PET restoration help needed in Commodore

Yes, on my DataI/O chart, the Hitachi 482732A uses the same family and pin code as the Intel 2732A. If you have no issues with the 2732A, you will...

109 replies | 3678 view(s)

June 30th, 2020, 06:49 AM

MikeS replied to a thread Commodore PET restoration help needed in Commodore

There seems to be some confusion... Absolutely wrong! The TI 2532 is NOT the same as others' 2732; the TI 2732 is. What is confusing...

109 replies | 3678 view(s)

June 29th, 2020, 07:15 AM

dave_m replied to a thread Commodore PET restoration help needed in Commodore

To check your programmer, try to program a 2732A on the 2732A setting (the adapter is not needed for this test of course). If this works, you should...

109 replies | 3678 view(s)

June 27th, 2020, 07:27 AM

dave_m replied to a thread Commodore PET 8032-SK problem in Commodore

How many bytes of memory does the start up screen say? It performs a short RAM test on boot.

2 replies | 108 view(s)

June 18th, 2020, 05:24 PM

MikeS replied to a thread Commodore PET restoration help needed in Commodore

Yeah, we've met some folks on here with amazing patience and persistence, way more than I can claim, and when all was said and done, almost all of...

109 replies | 3678 view(s)

June 17th, 2020, 09:54 PM

dave_m replied to a thread Commodore PET restoration help needed in Commodore

Thanks Mike, that was the write up I was looking for. I had forgotten that it was written by our friend Giovi who fixed his machine with only a DVM...

109 replies | 3678 view(s)

June 17th, 2020, 05:37 PM

MikeS replied to a thread CBM 8032 Resurrection Project in Vintage Computer Hardware

http://store.go4retro.com/adapters-1/ http://www.6502.org/users/sjgray/projects/multieditrom/index.html

167 replies | 6881 view(s)

June 17th, 2020, 05:27 PM

MikeS replied to a thread Commodore PET restoration help needed in Commodore

http://www.verrua.org/pet_repair/ (about 1/2 way down)

109 replies | 3678 view(s)

June 17th, 2020, 05:18 PM

MikeS replied to a thread TRS 80 cassette recorders in Tandy/Radio Shack

Two points: a preset playback level that really simplified things, and the ability to monitor sound through the speaker even though the cable was...

16 replies | 541 view(s)

June 17th, 2020, 03:24 PM

dave_m replied to a thread Commodore PET restoration help needed in Commodore

Yes, Dwight you beat me to it. I couldn't find the diagram on the web so I sketched one. Pin 24 must be Vcc on both sockets. Did I get it right?...

109 replies | 3678 view(s)

June 17th, 2020, 02:49 PM

dave_m replied to a thread Commodore PET restoration help needed in Commodore

Sky, Wired like that, the 2532 may program, but will not verify. To verify, the Vpp pin 21 of the 2532 must be at +5V. The adapter connects it to...

109 replies | 3678 view(s)

June 17th, 2020, 08:18 AM

dave_m replied to a thread Commodore PET restoration help needed in Commodore

You have BASIC2 ROMs. The ROMs that are different from the daver2 list may be bad or you have bad ROM sockets/solder joints.

109 replies | 3678 view(s)

June 13th, 2020, 04:24 PM

MikeS replied to a thread Petsoft Graphics in Commodore

Thanks for sharing!

1 replies | 168 view(s)

June 10th, 2020, 05:08 PM

dave_m replied to a thread Commodore PET restoration help needed in Commodore

I see the confusion, but there Dwight was referring to the very first PETs that used the 6540 ROMs. It came in an odd 28 pin package that allowed for...

109 replies | 3678 view(s)

June 10th, 2020, 04:35 PM

dave_m replied to a thread Commodore PET restoration help needed in Commodore

Hutch, This PET has the 4116 dynamic RAMS. One needs eight good chips in the I row to get to boot.

109 replies | 3678 view(s)

June 10th, 2020, 11:37 AM

dave_m replied to a thread Commodore PET restoration help needed in Commodore

Check the user manual to interpret the information. The manual can be found here:...

109 replies | 3678 view(s)

June 10th, 2020, 08:57 AM

dave_m replied to a thread Commodore PET restoration help needed in Commodore

SkyCaptain, The 2532 is pin for pin replacement for your 4K ROMs and do not need an adapter in the PET. You will need a special adapter to program...

109 replies | 3678 view(s)

June 10th, 2020, 08:42 AM

dave_m replied to a thread Commodore PET restoration help needed in Commodore

isn't there a timer in the UV eraser? Don't run for more than 20 minutes or it may damage the EPROM if it is a powerful lamp.

109 replies | 3678 view(s)

June 9th, 2020, 08:36 AM

dave_m replied to a thread Commodore PET restoration help needed in Commodore

Note that an adapter to burn a 2532 on the 2732 setting requires the adapter with an isolation diode to protect one of the pins from the 25V. Make...

109 replies | 3678 view(s)

June 7th, 2020, 09:16 AM

dave_m replied to a thread CBM 3032 screen interferences in Commodore

Hi Hugo, if our OP tries this, he had better make sure the four long screws that hold the transformer to the chassis are torqued very tight to keep...

19 replies | 683 view(s)

June 7th, 2020, 08:48 AM

dave_m replied to a thread Tektronix 4041 Thermal Printer repair - may also work on AIM-65 thermal printer in Other

An excellent well documented article on these thermal printers. Thanks so much. -Dave

3 replies | 236 view(s)

June 4th, 2020, 09:19 AM

MikeS replied to a thread ISA cards don't make contact with motherboard in my AT cases (486 motherbaord) in Later PCs

The barrels from dried-out ball point pens are a good supply of spacer material and they're insulated, so no risk of shorting the PCB to the chassis.

4 replies | 307 view(s)

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