3 Jun
2025
3 Jun
'25
12:07 a.m.
Thanks very much for the additional info!
Does your drive enclosure have DB-25's on the back, or only on the ISA
cards with DB-25 to CN-50 cables connecting the enclosure?
Where are the Comcode and FCC ID's on yours?
I don't think mine has those.
My drive enclosure has a pair of CN50s connected by a ribbon cable with
two internal IDC header connectors, looks like a vanilla SCSI
configuration with the two drives on the same bus.
Strangely, mine has only a single molex power drop, perhaps there was
originally a splitter that went missing with the drives.
Interestingly, the SCSI cable is flipped in twisted sections so that the
drives can be upside down with respect to each other; the orientation
tabs for the two IDC connectors point towards each other and towards the
center of the enclosure. I counted the pins and traced the wires just
to make sure it wasn't a floppy cable.
Richard Schauer via cctalk <cctalk(a)classiccmp.org> writes:
On 2025-06-02 13:26, Bill Degnan via cctalk wrote:
Do you know the controller model number?
OK, I tore into mine tonight. Here's what I see.
My machine is a PC 6300, the CPU 2 model. (I have three of these, and
another of them was marked CPU 3/X. Didn't check the third.) It was
built in 12/84 by Olivetti in Italy.
The two cables from the drive enclosure go to DB-25 female connectors
on two separate cards. In fact, it appears that other than sharing an
enclosure and power supply, the two drives have nothing to do with
each other.
The disk controller (marked with a red dot on the connector on my
machine) was made in 1987. It is a 1/3-length card, a WD1002A-WX1.
There are flying wire ends of a ribbon cable from the data and control
header plugs to the DB-25 connector, which is in a separate slot from
the card. Looks like a pretty standard MFM controller to me, not SCSI
in any way.
The tape controller (marked with a green dot on the connector on my
machine) was made in 1986. It is a full-length card, a Wangtek
30006-007 rev C. It has an 8085, 8257, 6264 SRAM, 2764 EPROM, what
appears to be a chipset of 2x CF40100BN, 1x CF40101N, and 1x CF40102N,
and some PALS marked Everex. I couldn't Google up what those
CF4010... ICs do very readily, although several sellers claim to have
some. There are two cards which are almost identical on Ebay right
now, items 393821606763 and 201549538949, although neither of them has
the DB-25 connector on the bracket. On mine it goes to a ribbon
cable, which goes into the header by means of flying wire ends.
The drive enclosure is an AT&T Comcode 405117714 (I guess I'd take
that to be a model number, since there isn't any other), with FCC ID
CLP77N187072. It is made in USA and contains a 20 MB hard drive and a
60 MB (or 67 MB according to the Iotamat tape I have in mine) tape
drive.
It occurs to me that although I occasionally see AT&T 7300/3B1
systems, I rarely see 6300s. Somehow I happened onto the three that I
have a long time ago and that was it.
Richard KF9VP