PLease ID CD-ROM unit

From: Max Eskin <>
Date: Mon May 18 19:25:15 1998

You're right. 6-9 DO go to the DC37. The cable is pretty much
straight through. Any other hints you need?

>> 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
>I think the 63701 is a microcontroller of some kind. No idea on the
>one, alas.
>> 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).

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Received on Mon May 18 1998 - 19:25:15 BST

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