Previous Thread
Next Thread
Print Thread
Page 9 of 10 1 2 7 8 9 10
Joined: Mar 2001
Posts: 17,146
Likes: 179
R
Very Senior Member
Offline
Very Senior Member
R
Joined: Mar 2001
Posts: 17,146
Likes: 179
Curt just checked in some work on the Tandberg driver, be careful smile

Joined: Mar 2006
Posts: 1,078
Likes: 6
L
Very Senior Member
Offline
Very Senior Member
L
Joined: Mar 2006
Posts: 1,078
Likes: 6
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


"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
Joined: Feb 2005
Posts: 449
C
Senior Member
Offline
Senior Member
C
Joined: Feb 2005
Posts: 449
Originally Posted by Lord Nightmare
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.

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

Joined: Mar 2006
Posts: 1,078
Likes: 6
L
Very Senior Member
Offline
Very Senior Member
L
Joined: Mar 2006
Posts: 1,078
Likes: 6
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


"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
Joined: May 2004
Posts: 993
Likes: 93
D
Senior Member
Offline
Senior Member
D
Joined: May 2004
Posts: 993
Likes: 93
At the top of wd17xx.c is an explanation of all model variations: http://git.redump.net/mess/tree/src/emu/machine/wd17xx.c

Joined: Mar 2006
Posts: 1,078
Likes: 6
L
Very Senior Member
Offline
Very Senior Member
L
Joined: Mar 2006
Posts: 1,078
Likes: 6
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


"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
Joined: Feb 2008
Posts: 106
J
Senior Member
Offline
Senior Member
J
Joined: Feb 2008
Posts: 106
Let me know if you need any photos of the inside of the keyboard

Joined: Feb 2005
Posts: 449
C
Senior Member
Offline
Senior Member
C
Joined: Feb 2005
Posts: 449
Originally Posted by JonasP
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.

Joined: Feb 2008
Posts: 106
J
Senior Member
Offline
Senior Member
J
Joined: Feb 2008
Posts: 106
ElBarto can probably tell you once he's unpacked after moving. smile

Joined: Jul 2008
Posts: 73
E
Member
Offline
Member
E
Joined: Jul 2008
Posts: 73
Exactly smile

Page 9 of 10 1 2 7 8 9 10

Link Copied to Clipboard
Who's Online Now
5 members (elcondor, Luengo, Stick, 2 invisible), 172 guests, and 2 robots.
Key: Admin, Global Mod, Mod
ShoutChat
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Forum Statistics
Forums9
Topics9,285
Posts121,455
Members5,064
Most Online1,283
Dec 21st, 2022
Our Sponsor
These forums are sponsored by Superior Solitaire, an ad-free card game collection for macOS and iOS. Download it today!

Superior Solitaire
Forum hosted by www.retrogamesformac.com