A. Jumper Configurations
32
W3-11 (Floppy Interface)
These jumpers select various options for the floppy interface. In general, these jumpers
should not be changed from the factory default. These jumpers affect how the floppy
disk controller interfaces to the floppy disk drive.
Do not install jumpers W6 and W7
together, nor W8 and W9 together, nor W10 and W11 together.
Jumper
Installed
Description
W3
DRV2 The state of this jumper is reflected in Status Register A (3F0h)
†
W4
DRVID0 This bit is reflected in the Tape Drive Register (3F3h)
†
W5
DRVID1 This bit is reflected in the Tape Drive Register (3F3h)
†
W6
Invert DRVDEN0 to floppy drive when in
W7
Drive DRVDEN0 to floppy drive directly (non-inverted)
W8
Invert DRVDEN1 to floppy drive when in
†
W9
Drive DRVDEN1 to floppy drive directly (non-inverted)
†
W10
Drive Write protect circuitry with WE* from FDC
W11
Factory Test option. Do not install with W10 installed
W12-18 (Interrupt Selection)
These jumpers allow the floppy disk drive interrupt to be routed to any of the backplane
interrupts on the STD/STD 32 bus (see the "
Interrupt Selections
" illustration in
Chapter 3). DOS-based systems use IR6 for floppy disk drive interfacing. Be sure to
configure the CPU board for this option. Ziatech uses INTRQ2*, by default, for floppy
disk subsystem interrupts.
Jumper Installed Backplane Connection
W12
IRQx* (Active HIGH) E47
W13
IRQx* (Active LOW) E47
W14
INTRQ* P44
W15
INTRQ1* P37
†
W16
INTRQ2* P50
W17
INTRQ3* E67
W18
INTRQ4* P5 (VBAT)
†
Factory default configuration
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