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Hi Everyone, I'm trying to repair a 3040 dual floppy which simply doesn't seem to work at all when I power it on. Looking at the circuit board I can see a capacitor has blown up and is all black and crumbling. It is in position C31, though all that part of the circuit board is black...

Hi All, I have a strange problem with my 8032 and hope someone can help. When I boot it up, the cursor is an inverted @ symbol, I can type but when I type something invalid and press Return it takes much longer than it should to process and show the "?syntax error" message and if I do this 4...

Hi Everyone, This forum is my last hope of fixing my 8032 which I've had for a while but have only just got round to trying to get it to work. When I first got it, it didn't do anything when powered on. However after replacing a couple of bad ROMs it now does the familiar sound when booting...

I've had a 4032 PET for some time now and it had been working fine until today when I went to switch it on and after a few minutes it suddenly went off. Subsequent reboots have left me with a blank screen, I don't even get the usual sound that happens on power on. The chips don't seem to be...

Thanks for the link Dave, believe it or not I haven't actually got any software for the PET I've only recently got it fully working and getting software/games from my PC to the PET is my next project. I'll do a bit of searching, I'm sure it's been answered before on this forum. Mike: I'm not...

Many thanks for the explanation of the assembler Dave, that made it clearer to me what it was doing. After hours of messing around I ditched the idea of changing all the different rom entries as suggested in the 1st article and instead tried changing the key mappings around again in the...

Hi Mike, Yes, the original edit rom in my PET is 901498-01 with a checksum of 43752 which is identical to the ROM of the same name on http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/ You're right, the business rom I've been using is edit-4-80-b-50Hz.901474-04-3681. There is a...

Thanks for your suggestions guys, Anders: I've tried copying the keyboard decoding table from my 40 col rom (E6D1-E720 - as indicated on http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/d/petdis) but the keys not displaying the correct character when pressed. Maybe there's more...

Hi Mike, Thanks for the link, that's a great article, I wish I'd followed that one from the start! I'm not sure about using that rom though, as you mentioned it's 60hz and my PETs a 50hz model. I'll have a crack at converting the assembler in that torpet article to hex, though I wonder if any...

I've been looking around for the edit rom file that will show 80 cols on a 4032. I've done all the hardware changes already but am just missing the rom. I've checked on http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/ but no luck, edit-4-80-n-50Hz.bin is what I need but it...