DrAlis's latest activity

Cross-connect the resistor legs (that you have removed from the PCB) and the pads: Dave

I got quite a few boards, but surely -0degrees must have them all ;) Aren't there several revisions? At least some differ by color. The...

Got MCS 4: Pro Log 900 in working order with suitcase. DM if interested. Best.

Are you looking for the unit, the card, or the cable?

Awesome materials, Hugo! I ran out of spare time, so further analysis will be postponed some days and I shall report back. Dave, I...

I made over 20 scope recordings of the DRAM support circuitry in this article pages 6&7, which might be a useful comparison if you are...

Not from this post, but I found a post where someone from UK offered to burn ROMs and DMed.

Multiple appliances (not just the PET) had filter cap units applied across the incoming line voltage. Many were three wire types which...

Sounds like a plan. Enjoy TV & chill :)

Well we got this far in the journey. See nothing stopping me and my cheap oscilloscope from taking measurements. Which one do we start...

Where would page 0/1 of RAM be located on the board? Closer to the hinge or further? Or is the page spread across the DRAM chips? Also...

Ah ok, i guess i could short there but installing a button for now seems overkill. will this yield more insight? has the gggg...

How to reset? Also how to find the bad 4116s I guess?

Thanks Dave. Sounds like good news. 4016: it shows another (or maybe two) screens quickly. The photo above is the final screen. One of...

Progress! I am getting convinced the PETTEST4032 ROM was delivered dead to me. I put the PETTESTV04 ROM in, which is the original from...