W83977F-A Datasheet, PDF (40/182 Pages) Winbond – WINBOND I/O

W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
765 43 ²¹ 0
XX XX X X
Tape sel 0
Tape sel 1
If three mode FDD function is enabled (EN3MODE = 1 in Logical Device 0 CRF0 bit:0), the bit
definitions are as follows:
765 43 ²¹ 0
Tape Sel 0
Tape Sel 1
Floppy boot drive 0
Floppy boot drive 1
Drive type ID0
Drive type ID1
Media ID0
Media ID1
Media ID1 Media ID0 (Bit 7, 6):
These two bits are read only. These two bits reflect the value of Logical Device 0 CRF1 bit 4,5.
Drive type ID1 Drive type ID0 (Bit 5, 4):
These two bits reflect two of the bits of Logical Device 0 CRF2. Which two bits are reflected depends
on the last drive selected in the DO REGISTER.
Floppy Boot drive 1, 0 (Bit 3, 2):
These two bits reflect the value of Logical Device 0 CRF1 bit 7,6.
Tape Sel 1, Tape Sel 0 (Bit 1, 0):
These two bits assign a logical drive number to the tape drive. Drive 0 is not available as a tape drive
and is reserved as the floppy disk boot drive.
TAPE SEL 1
0
0
1
1
TAPE SEL 0
0
1
0
1
DRIVE SELECTED
None
1
2
3
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