Advertisement
TABLE 2. ADDRESS SELECT JUMPERS
Floppy Drive and Data Rate Selection Control
BIOS ADDRESS RANGES
C8000-09FFF
CA000-CBFFF
CC000-CDFFF
CE000-CFFFF
FLOPPY ADDRESS RANGES
37X
3FX
PRIMARY/SECONDARY HARD
DISK ADDRESSES
1FX
17X
Address Select Jumpers
Table 2, Address Select Jumpers, lists the various jumper configurations for address
selections for both the hard drive and the floppy drive. Jumper connections Wl-W2
select the BIOS ROM/RAM memory addresses. The default address range (C8000-
C9FFF) is factory set. Jumper connection W3 enables the ROM/RAM BIOS when it is
jumpered.
Jumper connection W6 selects the floppy drive's address ranges. The default range is
3FX.
The module's primary hard disk address range is (1F0-lF7 and 3F6-3F7). To select the
secondary hard disk address range (170-177 and 376-377), jumper the Wl2 connector.
Diagnostic Register Latch Control
When installed, jumper connection Wl0 enables the diagnostic Digital Input Register for
operation in the latched mode; i.e., the register outputs latch when the register is
accessed. The jumper is normally not used.
WD1018 Mode Control
Jumper connections W8, W14, Wl5 provide three external mode selects to the control
processor.
W8 Jumper Connection
W8 (No Jumper) - This is the normal WDl007A-WAH/WA2 mode. The firmware forces
a 10 Mhz ESDI drive to 35 sectors per track when using the Set Unformatted Bytes per
Sector command. It is not necessary to set the drive's jumpers and switches for the
desired number of sectors per track. This mode supports a 1:1 interleave.
W8 (Jumper) - This mode allows the l007A-WAH to be used as a replacement board for
existing WDl005-WAH boards without reformatting the drive. The controller reads the
Unformatted Bytes per Sector from the drive.
W1
2-3
2-3
1-2
1-2
W6
W12
No Jumper
Jumper
JUMPER SETTINGS
W2
W3
2-3
Jumper
1-2
Jumper
2-3
Jumper
1-2
Jumper
Advertisement
