Recent content by automaticbirds

Hi all, sorry for the loooong delay. Been waiting for parts. So here's the news! I ordered some 4116 memory which arrived. I read somewhere you could 'piggyback' defective ram. So I went ahead for UA11. Amazingly the pettester passed and ran a good number of clean memory checks!!! I then put the...

Hi Dave, So I get this right I swap the attached to the alternate tracks to achieve this? Thanks Andrew

Great thanks, image attached. They are HM4716AP-4N chips. Hopefully my soldering skills won't fail me!

Great info Dave thanks!! So yes I would love to learn how to swap the banks. Also on changing UA11 what's the best practice? Cut the legs, or desolder gauze? Finally do I buy a standard 4116 ram chip from eBay or something more specialised? Thanks Andrew

Ok so it's failing on test 2 - page 0/1 test. Both page 0 and page 1 have errors, hence catastrophic failure. I would guess these pages are held in UA11. 🤔

Ah is it because that's the 8th set so the remaining 8 are non accessible?

Is that the one that reports bbbbbbbbbbbbbggg ie a partial failure?

Hi all, so the pettester arrived! Thanks to Colin, put into UD7 and the results are attached. I'll review the manual, but if anything is immediately obvious thanks!

Great advice thanks Hugo! Didn't realise fixing Pets was so covert. Caught the neighbour looking in so have drawn the curtains 👍🏻. Will hopefully have a pettester this week so will update you!

Hi both, Ok great, so I am not skilled in the EPROM arts but very willing to learn. Do I order an EPROM writer for pc, a 2k EPROM, and then write the binary to it (and where do I purchase these). And just for clarity, where is the edit roms location? Thanks!

I have also tested the main ram 5v and 12v is being supplied video Ram has 5v The J7 monitor connector has the correct voltages. The crt monitor gives a high pitched whine on power. The 6502 has 5v on pin 8 Would a romulator be the next step? Don't want to spend the £75 and find out does not...

Ok so power check 1. J8 power connector: Pin 8+9 - 16.65v Pin 1+5 - 18.4v Pin 1+3 - 9.2v Pin 5+3 - 9.2v I can connect the board next if you give me the locations to test 👍🏻

Ok back together as a 8032 board. All chips reseated. Still black screen, what do I start to measure? And shall I get your pettester Dave? Where do I get that from. I see the ramulator is out of stock. I can measure things in a list and feedback if that works? Thanks!

Ok thanks both! So I have deconstructed it and cleaned the boards. This is an 8096 board 8032080 with 64k sister board. The 6502 is on the sister. See images, if I move the 6502 back to the main board could this rule out a sister board issue? And make the machine a basic 8032 to test first?

Hi all, so bad news, I was happily typing away on the basic code, when suddenly the pet froze!. I had to switch it off. It now won't switch back on! Image attached of where I got to. Any thoughts on what could have happened? The fuses are fine, the pet makes the startup electric hum, but no...