Floppy Disk Drives / QUMETRAK 142 / Info

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Technical specifications

Formfactor 5,25"
Capacity 360 KByte / DSDD / (2 x 40 x 9 x 512 = 368.640 Byte)
Sides (Heads) 2
Tracks/Side 40
Sectors/Track 9
Byte/Sector 512
Height 41,3 mm (1/2 height)

Connection

Interface Ribbon cable (34-pin); the normal floppy cable, with a twist
Power supply +12V / +5V
Plug 4 pin (colloquial: Molex)

Jumper settings

On the 142, no jumper settings have to be made except Drive Select (DS). Since the 142 still uses the Shugart bus, it must be jumpered here on DRIVE 2 or DS1 (logical the 2nd drive) and the floppy be connected to the plug behind the twist. All other signals are transmitted as with the PC 34 interface (see illustration).

Comparison PC and various Shugart interfaces
Comparison PC and various Shugart interfaces

In detail: Twist Shugart bus on PC bus

Shugart 34 Signal PC 34 Signal
10 DS0 16 MOTOR ENABLE B
12 DS1 14 DRIVE SELECT A
14 DS2 12 DRIVE SELECT B
16 MOTOR ENABLE 10 MOTOR ENABLE A

When the PC controller sends the MOTOR ENABLE A on line (10), 142 will be correct at MOTOR ENABLE line (16). Likewise DRIVE SELECT A (14) on DS1 (12).

(tbr, 14.04.2018 / last changes: 15.04.2018)