fdc37m707 Standard Microsystems Corp., fdc37m707 Datasheet - Page 20
fdc37m707
Manufacturer Part Number
fdc37m707
Description
Fdc37m707 Enhanced Super I/o Controller With Wake-up Features
Manufacturer
Standard Microsystems Corp.
Datasheet
1.FDC37M707.pdf
(194 pages)
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Normal Floppy Mode
Normal mode. Register 3F3 contains only bits 0 and 1. When this register is read, bits 2 - 7 are a
high impedance.
Enhanced Floppy Mode 2 (OS2)
Register 3F3 for Enhanced Floppy Mode 2 operation.
REG 3F3
REG 3F3 Reserved Reserved
Note:
Tri-state
DIGITAL OUTPUT REGISTER
DB7
DB7
Bit 1
L0-CRF2-Bx = Logical Device 0, Configuration Register F2, Bit x.
0
0
1
1
Tri-state
DB6
DB6
Tri-state
Bit 0
0
1
0
1
DB5
DB5
Drive Type ID
Table 7 - Drive Type ID
Tri-state
DB4
DB4
20
L0-CRF2 - B1
L0-CRF2 - B3
L0-CRF2 - B5
L0-CRF2 - B7
REGISTER 3F3 - DRIVE TYPE ID
Bit 5
Tri-state
Floppy Boot Drive
DB3
DB3
Tri-state
DB2
DB2
L0-CRF2 - B0
L0-CRF2 - B2
L0-CRF2 - B4
L0-CRF2 - B6
Bit 4
tape sel1 tape sel0
tape sel1 tape sel0
DB1
DB1
DB0
DB0
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