18 May
1998
18 May
'98
12:25 p.m.
You're right. 6-9 DO go to the DC37. The cable is pretty much
straight through. Any other hints you need?
Toshiba.
OK, I finally brought the thing home.
The 37 pin connector is wired as follows:
Pins 1-17 are the only ones attached to something
It's fairly difficuly to trace, the traces keep switching
sides of the board and stuff...
1-4 are wired to 2-5 of 74LS245, then go on to 2-5 of 74LS541
Sounds like half of an 8-bit data bus. Where do 6-9 of the '245 go to?
(the DC37 connector, I'll bet).
How is the cable wired? In other words, where do these data pins end up
on the drive end?
Some others as well, I'll give you the exact
pins if you want.
The 8255-AC5 is mostly attached to the above-listed chips.
The drive box is a DATEXT Model DTX-10, released April 1986.
Inside, it has the drive itself, and two 9" X 9" boards. The bottom
one seems to be simply hardware stuff - nothing but resistors,
amplifiers, etc. The top one is the one with the centronics
connector. It has 12 TC40H***P chips. Also, some 74LS***P chips.
40Hxxxx are high speed 4000-series CMOS, I think, normally from
> Also, there are two huge chips, 60-pin or something. These are
> HD61Z002 and HD63701XOP. All chips are Hitachi-labelled. There is
also
I think the 63701 is a microcontroller of some kind. No idea on the
other
one, alas.
(at
a 34.5774 MHz crystal. Lastly, an EPROM w/the
window covered over.
I hope it's OK that I lifted the tape. It's MBM2732A-30. The only
That shouldn't have done it any harm, but keep sunlight off the chip least unitl you've backed it up).
-tony
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com