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Some but not all 80186/80188 chips have an onboard UART. For example, the very common 80C188EB has two of them. The original 80188...

probably won't help too much, but I noticed this machine when it came up at an estate auction earlier...

Sure, you have the stepper positioner attached to a capstan (in the nautical sense). A thin steel fork-shaped band is wrapped around...

That I'm not sure of. When I took the machine apart it didn't have any signs that I could see of it being opened before. Do you know if...

How will the SD card be represented? As a CP/M hard drive, or cache for network adapters?

Oh, good - it arrived. I'm hoping to get some time this weekend to work on the SD card support for it...

Sorry, I should have included the fact that I made DOS diskette from a .IMD file, which Windows was able to read just fine last night...

I was mistaken about how much memory the terminal has. The memory map is here. It is also obvious why the roms are grouped in two...

If the 81-302 ROM was showing the CRTC working, I'd forget about the CRTC tests for now. Let's focus on what we know is broken. So...

Wait, you were using Imagedisk to write a format? I don't believe that will write a file system (I think), so it won't be readable in...

XT type systems cpus are 16-bit internally.with 8-bit data bus.

Ah, ok, Im not up on history, were they still 8-bit systems at that point?

Very helpful thank you. I hope the chip is still available as I have enquired about it.

Booted the PC back up today and it can't read properly formatted disks again. Back to the same issue. Again. 😐 I really wanted to just...

I have some news! I also have a suggestion how we finally may do this dump without sacrificing a DD drive. More on this towards the end...