Recent content by SuperSVGA

There are pre-built files in the Releases section, and GitHub Actions should be setup to build automatically, but if you wanted to build locally you would need to: Download the repo (along with the submodules to ensure picodvi is included). Have cmake installed (probably some other dependencies...

I have the design/source up here. I haven't been selling any yet but I suppose I always could. https://github.com/rezafouladian/PortableVideoAdapter

They're usually 3.3V or lower. You would need level shifters.

Yeah the TSOP/QFP RAM is crazy expensive compared to the BGA stuff, 8MB in a single BGA chip is only like $7 even right now, as opposed to $40 for 4x of those.

It likely would have been BYTE# on any ROM in that form factor, since they would be following the JEDEC standard.

This is only for the sleep issue affecting that space of RAM above 5MB if that register is not accessed after a reset. There may also be additional registers that affect access times as well. The backlit Portable has faster RAM access times on the first 5MB of memory, and the rest uses the...

It's also important to note that this mapping is handled by ReadXPram/WriteXPram, not the Power Manager. If you are sending direct xPramRead/xPramWrite commands, you have to do the mapping yourself as all the locations are converted to 0x00-0x7F by the OS. The original 20 byte PRAM is also...

They do work just fine since the entire driver is in ROM: Getting it in the Powerbook 100 would be tricky, since you need both access to the bus as well as the signals from the CPU GLU, at least to implement it the way Apple intended. As I understand the SLIM cards got delayed because...

Sounds like chip erase but I think that's only the AM28F020A.

As long as it's running fully from RAM at the point that you switch ROMs it would work fine.

I did use an original TechStep, but I'm not sure where my original Vol. 4 cartridge is so I just built a new one yesterday. There shouldn't be much difference between the cartridges though, there isn't much going on in there. It is very odd though, making changes to display resolution shouldn't...

I believe both the ADB and SCSI entry methods are just putting the computer into test manager mode, same way you would do by hitting the interrupt switch on machines that have it. ADB is likely just sending the interrupt key combo (i.e. Command + Power) on machines that support it, and the SCSI...

Mine works fine on a stock CC with no mods. All tests pass except for sound on my board, though maybe I just have something broken there. Are you able to test to make sure serial is working properly, or check the -5V somehow? It did look like the TechStep was putting it into test manager fine...

The address line test failure (error 5) is a bit tricky to precisely decode because it's an XOR of the contents of memory against the expected value. My guess would be that it wrote 0x00010000 to location 0x00010000, but when it read it back it got 0x00000000. This would be the point where it...

I have this copy of firmware 1.55 that was on my computer. I'm not really sure why I have it, I don't have any SIMCheck hardware.