well on a whim i got this earlier this year to repair it.. and found someone had been at it all ready...
so i did a bit of surcharging and reading on the net and cant get any technical manuals that are in English.. and whats in Japanese are not that good..
so with magnifier glasses i did a check on the board after taking it out to find the awful work someone had done... if you are on this site sorry but to me it was.. and if you can shed any light on the unit and what it was doing when you got it PM me thanks..
well long story short i have removed all the piece meal sockets that were made and the bad solder job on the battery connector on the board.
while i was at it i made a shim card to do the ram upgrade that was done as a piggy back on to the rom back then.
this way i could put it back to what it was if needed or wanted too. Just need to find out where to pick the X5 up from for the keyboard/ram delay.
it has been done on other versions of Sony and Panasonic but not the F1 the other versions have different boards to the standard F1.
anyway while trying to find any info i did a re-jig of the turbo msx moard that works for all most any Z80 board to run dual speeds 3.57Mhz and upto 10Mhz turbo. the boards are being made as i wright...
so now some pics and then update when i get the boards installed..