What's Pioneer UC-V102
It's a MSX2 computer, a very expansible MSX2 computer. It already come with a FDD controller and two floppy disk drives, a RS-232C serial interface, superimpose capabilities and many slots.
|Front: (first row) Floppy Disk B and A (3.5" DD), reset button;|
(second row) power button, MSX cartridge slot (50-pins),
controller 2 and 1 (DB9 male)
The slot map of Pioneer UC-V102 is a bit unusual with RAM in slot 0/2. For some reason the MSXMEM2 always counts 256KB of memory mapped RAM on this machine; with or without my SD-Mapper connected (which have 512KB RAM).
|MSXMEM2 output. The slot 1 is the external cartridge slot, |
with a SD-Mapper connected. You can see that we have RAM
in slot 0/2 (built-in) and in slot 1/3 (SD-Mapper)
Without the SD-Mapper connected, TestRAM finds the correct amount of RAM, 64KB. With the SD-Mapper connected it hangs while detecting the Memory Mapper.
|TestRAM running without an external Mapper connected|
The actual slot map for Pioneer UC-V102 is:
SLOT0-1: MSX2 SUB-ROM
SLOT0-2: 64KB RAM
SLOT3-0: MSX Disk-ROM
Wow! You can see that this machine have a lot of expansion opportunities! At front it have one primary slot cartridge and, internally it have six secondary slots. The 100-pins expansion slots are, for real, two 50-pins slots, side by side.
|The Pioneer UC-V102 expansion slots|
Each column of three slots goes to a connector in motherboard, named "Expansion SLOT A" and "Expansion SLOT B". Pioneer sold some expansion boards to use in UC-V102: the dual serial board (with two of those, the Pioneer UC-V102 could control up to five Laserdiscs) and the digitizer board. No pictures of any of these boards, but I guess that the "dual serial" board is (more or less) two MSX serial interfaces glued together. I still did not test MSX cartridges in these slots, but I hope to do that soon.
I did the ROM dump from all slots that have a ROM installed using the SAVEROM and did put the extracted files on this ROMs tarball. The files named UCV102PS.SLT are full dumps (0000h to FFFFh) of primary slot P and secondary slot S. The files with .ROM suffix are only the memory pages where MSXMEM2 shows there is a ROM installed.
Examining the DISK.ROM, we can found an Easter Egg showing that not only the UC-V102 keyboard was borrowed from Mitsubishi ML-G30:
This bios program is coded by T.Osada
This hardwear is developed by M.Ishikura
This casing is designed by N.Miyazaki
Consumer's electric product development section
GUNMA Works , MITSHUBISHI ELECTLIC SOCIO TECH
I really don't know what to think about that. The machine looks like a work from Pioneer, there is a Pioneer ASIC on the mainboard. We already saw Mitsubishi's keyboard being used in MSX computers from other brands, so it's not so surprising see the same keyboard with Pioneer UC-V102, but the use of same DiskROM opens some doubts: Did Pioneer copied this ROM without the Mitsubishi knowledge? It was a licensed work? Mitsubishi had something more with this machine?
These doubts will remain open and maybe will never be answered. While we wait those answers, let's see the Pioneer UC-V102 hardware. In our next post.