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Looks like the 6845 gets out of sync with the screen. Its a tricky thing to get right.

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The emulated Amstrad PC1512 and PC1640 have a keyboard problem. crazyc diagnosed it as "d" acting as "backspace"
Hitting the "d" key multiple times sometimes leaves a "d" standing, but it's hard to type "cd" as the leading "c" usually gets erased ...


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This page has got the ROMs, bootdisks and some docs about Atari's PC line

http://www.ataripc.net/bios/


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Originally Posted By rfka01
The emulated Amstrad PC1512 and PC1640 have a keyboard problem. crazyc diagnosed it as "d" acting as "backspace"
Hitting the "d" key multiple times sometimes leaves a "d" standing, but it's hard to type "cd" as the leading "c" usually gets erased ...


It happens because MAME maps joystick left to D by default and that translates to backspace in Amstrad's DOS.

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The Amstrad keyboard has a joystick port. According to this document mouse and keyboard also generate scancodes.

https://www.win.tue.nl/~aeb/linux/kbd/scancodes-3.html

I will try to redefine the joystick mapping from Amstrad's DOS as mentioned here

http://www.vcfed.org/forum/archive/index.php/t-35363.html

and then report back smile

Last edited by rfka01; 09/02/16 10:14 AM.

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OK, changing the "P2 LEFT" setting in MAME's "Input this machine" menu of the PC1512 driver to, say, Shift-D, gets rid of the issue of disappearing characters.

The NVR utility has settings for keyboard, mouse and joystick but covers only the mouse and fire buttons and the DEL=> key.

PC1640 and PC1512 service manuals here ...

http://www.retroisle.com/amstrad/pcs/Ori..._Agujereado.pdf

http://www.retroisle.com/amstrad/pcs/Ori..._Agujereado.pdf


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There's a lot of documentation on the NCR PC4i available now:

http://oldcomputers.dyndns.org/public/pub/rechner/ncr/PC4i/manuals/Complete_Document_Set/index.html

The guy who runs the site cooperated with

http://vintagecomputer.ca/files-area/

which has a lot of stuff on other old machines.


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Toshiba T1000 WIP: https://github.com/mamedev/mame/pull/1850



(screenshot taken before adding RTC chip to memory map)

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+ ROM-DOS boots fine. Diags are not passing yet (apparently T1000 uses a 80C50 as keyboard controller, and diags are trying to test its 160 bytes of memory...) and I've no idea how expanded memory ("HardRAM") is configured -- port 0xC3 is a good condidate though.


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Isn't port 0xc3 within the 2nd DMA controller range? Or did the T1000 have something else mapped there?

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