CR03
This
register can only be accessed in
initialized to 03H. The default value after power
up is 780H.
the Configuration Mode and the CSR has been
Table 50 - CR03
BIT NO.
BIT NAME
PWRGD/
DESCRIPTION
0
Bit 0
0
Pin function
GAMECS
PWRGD (default)
GAMECS
1
1
Enhanced Floppy
Mode 2
Bit 1
Floppy Mode - Refer to the description of the
TAPE DRIVE REGISTER (TDR) for more
information on these modes.
0
1
NORMAL Floppy Mode (Default)
Enhanced Floppy Mode 2 (OS2)
3
4
Reserved
Reserved - Read as zero
Bit
DRVDEN1
4
0
1
Pin DRVDEN1 output
DRVDEN 1 output
DRVDEN 1 high (default)
5
6
MFM
IDENT is used in conjunction with MFM to define the
interface mode of operation
IDENT
IDENT
MFM
MODE
1
1
0
0
1
0
1
0
AT Mode (Default)
Reserved
PS/2
Model 30
7,2
ADRx/
Bit - 7 Bit - 2 Pin 94
DRV2 EN/
IRQ_B
0
1
1
x
0
1
DRV2 (input)
ADRX
IRQ_B
123
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