Specifications

Two additional options, shown in Table 2-21, allow you to alter the DMA channel and inter-
rupt channel assignment. Changing these from the defaults is not recommended because it
would sacrifice compatibility with the board's
ROM-BIOS.
Table 2-21. Floppy Interface Options
JUMPER SIGNAL
FUNCTION
WS-1 DACK1
DNA acknowledge chamel option.
WS-2 DACK to FDC
Default:
2/3
(DACK2), via a trace.
WS·3 DACK2
W7-1
DR01 DNA request chamel option.
W7-2 ORO from FDC
Default:
2/3
(DR02), via a trace
W7-3 DR02
W10
IRQ6
When shorted, connects board's floppy
controller to interrupt request IRQ6.
Must be shorted if the board is equipped
with a floppy disk controller.
Default: shorted
W26-
Select floppy drive type for drives A
W29
and B, as shown in Tables 2-19 and 2-20.
Default: all unshorted
W32
PC Switch 8 Drive quantity, as shown in Table 2-18.
W33 PC Switch 7
Default:
W32 on, W33 off.
W39
PCVAL Write precClq)enSation value. Unshorted
selects 125 nS. Shorted selects 187 nS.
Defaul t:
unshorted
W40
DRV Drive type. Unshorted selects single
speed drives. Shorted selects dual
speed
drives.
Default: unshorted
W49
Must be shorted.
Default:
shorted
2-20