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So I get this written to a port:
SIEMENS 80186 SINIX
COPYRIGHT (c) 1984 BY SIEMENS AG
Size of free memory = 830 Kbyte
Computername: sie001, Version: 1.2, Release: 25.Feb.1987 Unfortunately it's the wrong port and worse it's the video controller config port. At least it's booting.
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Wow! Great progress, thanks!
NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
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Maybe the MMU remaps the I/O space in addition to memory?
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 So this is the best I can do for now. It's not remapping because it starts in the bootloader before the MMU is even enabled. My only guess is that the graphics board on the PC-X is different from the one in the PC-D. If you look at the pictures that rfka01 posted of the PC-X the graphics board has an 8031 which the PC-D has an 8047. It also has an extra ROM chip. Maybe the 8031 presents a terminal like interface and can write directly to the VRAM and the extra ROM is a character ROM instead of RAM (the tech manual says this is an option).
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It's alive  ... that's the main thing! Once again, thanks ... chances are good I'll get BIOS files from a real PC-X some time during autumn, I am sure your work now is a great basis for that.
NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
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Joined: Jan 2012
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I'd be surprised if the BIOS ROMs are different as the PC-D ones have the MMU tests. The graphics ROMs are the ones of real interest for me.
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Axel, who I've been in contact with about the PC-X, documented the disassembly of his machine and put the ROMs online: http://www.geekdot.com/siemens-pc-x/Thanks to another contributor!
NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
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Got it.  Need to figure out how the attributes select the line drawing characters. Edit: 
Last edited by crazyc; 09/09/15 05:26 PM.
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Ooh, nice
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