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You also need to triple check all of the previous repairs with a meter to make sure you don't have any broken or bridged traces. And check all connections using the schematics.

And a relevant post here. https://www.lemon64.com/forum/viewtopic.php?t=76213

Any now you know that it's not a bad ram chip. Looking at Ray Carlsen's site, U17 (74ls373) can also cause a Garbled Screen. And looking here.. https://retrorepairsandrefurbs.com/2021/05/18/commodore-c128-board-repairs/ Shows u17 controls char rom access..

Do the swap between ram banks like the video above shows, completely swaps banks 0 and 1, and then you may be able to see what's going on. It's just lifting one side of 2 resistors and running 2 small wires.

You can also swap the ram banks using the resistor trick shown in this video.

The sprdef command is just a text mode 40 col program. Try this program, it will draw a X sprite near the center of the screen and move it horizontally across the screen to the right.

Are you able to run some sprite commands in 128 mode? What do the sprites look like? Are they corrupted?

RGBtoHDMI. One of these with the TTL board can handle CGA/EGA/MDA(Hercules) to HDMI. That way you can play with more video cards/modes/computers without having to buy more adapters.

What was it in? You can get an idea of what address pins were in use.

I've never even plugged it in, it's stored under my bed.

That card doesn't have any ram, it uses the IIe's Ram. There were a lot of clones. https://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Interface%20Cards/Z80%20Cards/ Including a brand new one that's much faster that's available to buy now.

Did you mod the wimodem to run on the pet? https://www.cbmstuff.com/forum/showthread.php?tid=839

I used a rom splitter that ran under a st emulator, I just booted it, then used the splitter on the 104us.img and selected 6 roms. I actually used 6 27c512s and doubled up the rom per chip. I'm sending you a PM

I just used a RPD-60A as a replacement for an Atari St power supply. I love my meanwells.

I forgot to show off my printer/typewriter. Apparently a OLYMPIA ESW-103, with a IEEE-488 thrown in.

XP introduced SLP activation, which most ODM (Original Device Manufacturer) used to activate. It was a copy of xp with oembios.* files that were customized for the oem bios strings. Very easy to crack/exploit. I ended up using SLP on my white box systems for years, using the intel bios tools...

I'm running a 5160 with a MFM drive and a XT-IDE, and a 5162 (286) with a MFM and XT-IDE, no problems.

I've got one of these with a ide adapter board and 128mb installed. It has Windows 98 installed and working on a microsd to ide adapter.

I make and sell wifi modems, and everything is on my github, and the documentation has taken me as long as actually designing some of the boards. And it's not that long of documentation, it's just not my strong point to write it. If I wasn't selling the boards, I don't think I would have...

I was assuming low to enable , and that's the high address line. I actually just doubled up each rom and burned so they would work either way.