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Post by mobluse on Feb 8, 2014 7:14:02 GMT -8
Maybe 8086tiny could be made to emulate the Amstrad PC1512 (documented at www.seasip.info/AmstradXT/1512tech/ ). It had an extended CGA-mode with 16 simultaneous colors in 640x200. It also used a single 5.25" 360KB FDD. PC1512 was my second computer but I soon replaced the Intel 8086 with a NEC V30 CPU (similar to an enhanced 80186 but also with 8080-mode) and added 128KB RAM, 30MB HDD, 720KB FDD, and a 1200BPS modem. The goal would be to run the original 360KB diskettes that were shipped with PC1512 such as CP/M Plus with GEM desktop. |
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Post by Adrian Cable on Feb 9, 2014 0:26:26 GMT -8
Hi mobluse,
Thanks for your post! I had a PC1512 myself and thought it was a great machine for the time. I remember running DOS Plus with GEM and playing with GEM Basic ...
From what I recall from an emulation perspective you are almost already there with 8086tiny as it stands. The missing things are the extended CGA mode, and the support for 360KB floppy drives. Support for the latter could be added in the BIOS, and the former could certainly be supported by appropriate changes to the source.
While my aim is to keep the "official" 8086tiny code base as general as possible I encourage you to add PC1512 emulation if you feel like a challenge! If you achieve good results I'd be very happy to link to your fork from the official page.
Good luck!
-Adrian
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Post by mobluse on Feb 9, 2014 4:58:20 GMT -8
I think one also must emulate the special PC1512-mouse in-order to use GEM, DOS mouse driver for PC1512 etc. I also used 400KB floppy diskettes in my PC1512: "*400 KB 5.25"* ... PC: MS-DOS, 10 sectors, DS, 40 tracks; formatted by various utilities; readable by some versions of MS-DOS." arcib.dowling.edu/cgi-bin/info?(fdutils)Interesting%2520formatsI don't have time or knowledge to do this now so anyone is welcome to help make an Amstrad PC1512 emulator. About the NEC V30 CPU: datasheets.chipdb.org/NEC/V20-V30/NEC_uPD70116.pdfwww.retroarchive.org/cpm/cdrom/CPM/GENDOC/UPD70116.V30As I understand it you've implemented an Intel 8086 and added all 80186 instructions. Is this exactly the same as 80186 or did 8086 have some quirks that 80186 didn't have? Maybe you could implement V30 (perhaps without 8080) instead or are there important programs that depend on the 8086 quirks? The V30 had some extra instructions that the 80186 didn't have. I think the microcontroller version of V30 is still in use. I have a Casio calculator with a V30 and also an HP handheld computer with a NEC V20. |
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Post by Andrew Hodson on Sept 13, 2014 14:18:32 GMT -8
= DOS+ which includes CP/M, I've still my 1st PC = Amstrad PPC640, has V30.
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z80eu
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