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)
Jumper settings and cabling
On the QUMETRAK 142, no jumper settings have to be made except Drive Select (DS). Please do not get confused. The drive numbers can be described in the literature with DS0 to DS3 or DS1 to DS4!
Floppy A: Since the 142 still uses the Shugart bus, it must be jumpered here on DRIVE 2 or DS2 (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.
In the end, the cabling and jumpering is like the IBM PC/XT/AT. Always select the second drive (DS2) and connect drive A after the twist (with terminating resistor) and drive B before the twist (without terminating resistor). That's it.
Comparison: PC and various Shugart interfaces
In detail: Twist Shugart bus on PC bus
Shugart 34
Signal
PC 34
Signal
10
DS1
16
MOTOR ENABLE B
12
DS2
14
DRIVE SELECT A
14
DS3
12
DRIVE SELECT B
16
MOTOR ENABLE
10
MOTOR ENABLE A
When the PC controller sends the MOTOR ENABLE A on line (10), the QUMETRAK 142 will receive at MOTOR ENABLE line (16). Likewise DRIVE SELECT A (14) on DS2 (12).
