Recent content by crock

1. It reports DOS 3.0 on power on, but all those are a bit arbitrary. 2. I think it's broadly the same. I never measured it but I do not remember it being noticeably faster or slower. The format is slower though as it's a 2 pass process. 3. I don't think that's correct. Power to the spindle is...

I have an 8280 which I restored years ago. Formatted capacity is 3946 blocks, so about a megabyte. One of the use cases of the 8280 was that it can also read IBM 3740 format disks, and the drive supposedly came with utilities to read the, but I have never managed to track them down. As to the...

I have a rather nice condition PET 2001, which mostly works OK. It has the 6550 RAM's and 6540 Basic-1 ROM's. It boots, shows the correct RAM, and basic programs seem to run OK. However, the cursor flashes intermittently and sometimes stops flashing completely. That made me suspect the IRQ...

Hello all, my SuperPET doesn't have the keyboard stickers for APL, which makes it very difficult to use. Could someone who has a SuperPET with the APL stickers do me a huge favour and take a high-quality photo for me to use a reference please? Many thanks, Rob

Nope, black bullet shaped ones. Here's photos of the failed caps and fuse, plus my ugly repair until I receive some axial 4.7 uf caps.

I have a Tandon TM848-2 8" floppy drive where the fuse next to the power connector has blown. No idea yet where the cause is, but I can find no info on the rating of the fuse, and it doesn't appear on the schematics, at least that I can find. Does anyone know what a suitable replacement would...

Gents, I've got a clone of the DAMS IEEE cartridge for the C64, but unfortunately it's just died on me. As the EPROM was soldered into the board, I had never got around to reading the ROM contents, which is annoying, as I'm fairly certain that is what just died. Does anyone have a) a ROM image...

Hello Gents, A bit of a long shot here. This week I have mostly been going through my drives re-capping those that use the JU570-2 mechanisms with the leaking capacitor issue. The drives in my 8250LP work perfectly now, but one of them has a broken actuator on the latch shaft, it's the one...

Hello All, I'm in the process of refurbishing an early switching PSU from a Commodore 8296D and I'm trying to identify the orange disc component in the attached image. I think it's a high voltage capacitor but I'm not certain, and neither do I understand the markings. If it is a cap, what is...

Gents, I am looking for a PRG that I can run on a PET or CBM-II to measure the RPM of a connected IEEE drive. I am certain I have used one within the last couple of years but all my searches today were fruitless. :-( Does such thing exist or am I remembering wrong? cheers, Rob

Hello everyone, I recently acquired a Commodore 8280 8" floppy drive which looks it's spent the last thirty years outside in a barn. As such it needs completely stripping down and as I have no 8 inch disks other than unformatted blanks, I'd really like to borrow an alignment disk for...

All, I acquired an 8096 SK a while back with some unknown ROMs - at least to me. When it boots it tries to load a file called "autoload" from device 8. The only clue I found to them was on a humanist website, which suggested that a company called PPM in Brookwood, Surrey, UK used to convert...

Hello all, Does an archive of commercial pet titles exist, either game or productivity? I know there's a few bits on zimmers and some PD stuff on TPUG but the PET has nothing like those that exist for it's descendants (vic, 64, plus4/c16 and amiga.) I recall that someone off this list (drea?)...

Hiya all, I have a recently restored an 8032 that has been giving me sporadic problems with blowing fuses. When I first got it, it was completely dead. After cleaning it all up, replacing one of the rectifiers, some RAM, a burnt out trace and removing the line filter, it's now working well...

Gents, My preferred way to work on PET boards is to have the board out of the machine and hooked up to a bench supply and a small LCD monitor. This is easy using one of Matthew D'Asaro's composite adapters but they only work on the old non-CRTC PET's. They don't work on CRTC based PET's. Now...