Home Page Forums MAME MAME Offer: Tandberg TDV2324 CP/M computer from the 70s

Curt just checked in some work on the Tandberg driver, be careful

This was after his fdc cpu commit a few hours ago, don't worry.
EDIT: committed. hopefully this doesn't hulk-smash too much of Curt's work.


LN

I didn't yet have time to go back to it after the FDC thing, so no problem.

If you want to do more stuff to it, go right ahead. Without doing more research into whats being written to the i/o ports I have no idea what else goes where right now (though I sort of assume the WD1797/FD1797 FDC, which I assume is similar to the wd1770 or 1772 but cannot find a datasheet for, connects to the fdc cpu somehow)

LN

At the top of wd17xx.c is an explanation of all model variations: http://git.redump.net/mess/tree/src/emu/machine/wd17xx.c

Ok after reading the manuals JonteP scanned (see http://forums.bannister.org/ubbthreads.php?ubb=showflat&Number=70650#Post70650 ) and checking disassembly:
* The "Specifications and Installation Guide" chapter of the owner's manual doesn't have any extremely useful circuit-level schematics, but does hint at what processors run slave to which others, and what should connect to where.
* I'm fairly certain that 0xE6 read that happens on the maincpu is waiting for one of the two other cpus (the fdc?) to finish its self test and set a status flag before the main cpu will run. Despite what the manual says I have not found a maincpu or subcpu rom checksum test yet, but they may well exist. The fdc cpu clearly has one and it passes.
* I'm also not sure where the EAROM 'eeprom/nvram' chip maps to, nor am I sure it is dumped yet. I hope it still works, as those chips have a bad failure record on atari arcade boards.
* The main cpu is responsible for the serial interface ics, PROBABLY responsible for the interrupt controller, and the other two cpus run slave to it.
* The sub cpu should more properly be called the display cpu, and more or less implements a complete terminal of sorts within the system, and is also responsible for talking to the keyboard.
* The keyboard is rather complex, and almost certainly has a processor or mcu inside which is not dumped.

LN

Let me know if you need any photos of the inside of the keyboard

Those would be very useful!

Can you tell me what text is printed on the chip in P1010038.jpg location 15B/U121?

And also the labels for the PROMs/PALs in P1010036.jpg? They are all white in the picture.

ElBarto can probably tell you once he's unpacked after moving.

Exactly