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Sam Drive

Submitted by Frode on Tue, 2006-04-18 15:03. Built-in


MGT


1990

The Coupé could support two 3.5” Ultraslim Citizen Double Density drives each with their own WD-1772-02 disc controller allowing both drives to operate independantly.

Unformatted capacity 1Mb, formatted as double sided, 80 track per side, 10 sectors per track, to the IBM 3740 standard gives 800kB with 780kB usable after directory space subtracted.

Having the drive controller within the drive housing meant that the floppy drive connectors could be used for other devices, most notablty the ATOM IDE interface.

Drive Connectors:

Connections to the two drives are made via two 32-pin Euroconnectors, with rows A and B connected. Drive 1 is on the left of the machine and drive 2 on the right. A list of signals available at these sockets are shown below.

PINSIGNALPINSIGNAL
1A0 VOLTS1BWR
2A0 VOLTS2BAO
3A0 VOLTS3BAI
4A0 VOLTS4BDO
5A0 VOLTS5BD1
6A0 VOLTS6BD2
7A0 VOLTS7BD3
8A0 VOLTS8BD4
9A0 VOLTS9BD5
10A0 VOLTS10BD6
11A5 VOLTS11BD7
12A5 VOLTS12B8 MHz
13A5 VOLTS13BRST
14A5 VOLTS14BNo connection
15A5 VOLTS15BA2
16A5 VOLTS16BDISK 1 OR DISK 2


Presumably, three editions of the user’s guide were published. The 3rd edition can be found as a PDF Manual Scan at www.samcoupe-pro-dos.co.uk


There is a bug that can cause disc corruption if a disc is left in the drive and the reset button pressed.

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