- MTX
- 64KB DRAM
- Output to old monitor and TV
- 80 column card
- Old style SDX FDC
- CP/M boot ROM (slot 3)
- Supports B:03,C:03 from CP/M only
- Attached to 5.25" Shugart floppy
- MTX
- 64KB DRAM
- Video daughter board removed, output to VGA via YUV input to Gonbes 8200
- 80 column card
- Output to VGA via RGBS input to Gonbes 8200
- Old style SDX FDC
- CP/M boot ROM (slot 4) and SDX ROM (slot 5).
- Supports B:07,C:07 from CP/M, and B:07 from SDX BASIC
- Attached to Epson SD800 dual combo 3.5" + 5.25" floppy. B: is 3.5", C: is 5.25". 5.25" configured to run at 300rpm
No extra memory, so I can't add virtual tape support.
- MTX
- 32KB DRAM, not working
- Output to old monitor and TV
- New style SDX FDC card (soldered)
- 512KB DRAM
- bipolar PROM address decoder, with off-by-one error
- SCPM style CP/M boot ROM (slot 4) and buggy SDX ROM (slot 5)
- Supports B:07 from CP/M and SDX BASIC
- RS232 card (hacksawed, soldered)
As given to me by Geoff Boyd.
- MTX
- 32KB DRAM, not working
- 2_0 address decoder GAL, to disable onboard DRAM
- output to old monitor and TV
- Modified OSROM, patched to support virtual tape
- New style SDX FDC card (soldered)
- 512KB DRAM
- address decoder GAL replaces bipolar PROM
- SCPM style CP/M boot ROM (slot 4) and fixed SDX ROM (slot 5)
- Supports B:07,F:52 from CP/M and SDX BASIC
- RS232 card (hacksawed, soldered)
This makes this system an SDX Plus.
- MTX
- 32KB DRAM
- VRAM, faulty
- Output to old monitor and TV
- MTX
- No DRAM (bodged upgrade to 64KB)
- VRAM replaced
- Video daughter board removed, output to VGA via YUV input to Gonbes 8200
- OSROM and BASICROM removed
- REMEMOrizer
- 512KB SRAM, providing
- 64KB main RAM
- 320KB RAM Disc
- 2x64KB virtual cassette tapes
- OSROM and BASICROM, with virtual tape patch
- CP/M boot ROM (slot 4) and SDX ROM (slot 5)
- Supports B:18,C:19,C:1A,D:1B,F:52 from CP/M and B:18,F:52 from SDX BASIC
- 80 column output to VGA
- Speculator hardware
- Numeric accelerator
- ROM 2 support
- MTX
- 256KB DRAM, faulty
- Output to old monitor and TV
- MTX
- No DRAM (bodged memory replacement)
- Output to old monitor and TV
This system used primarily for testing.
My REMEMOTECH :-
- Z80 compatible CPU, at 4.166MHz and other speeds upto 25MHz
- 384KB RAM, 72KB ROM
- PS/2 keyboard
- VDP, outputting to 640x480 @ 50Hz (or 60Hz) VGA
- Sound chip
- 80 column card support, with 80x24 and 80x48 modes, outputting to 640x480 @ 60Hz VGA
- Whether VDP or 80 column output appears on main VGA output switchable
- The other display can appear on another VGA, with an appropriate adapter
- RAM Disc support (upto 320KB)
- SD Card as a large and fast alternative to floppy disk
- Modified SDX ROM using SD Card and RAM Disc instead of floppy disk
- Virtual cassette support