FabiaTech Corporation
53
CMOS RAM Map
Register Description
00h -10h
Standard AT-compatible RTC and Status and Status
Register data definitions
11h – 13h
Varies
14h Equipment
Bits
7-6
Number of Floppy Drives
00
1
Drive
01
2
Drives
Bits 5-4 Monitor
Type
00
Not CGA or MDA 01 40x25 CGA
01
2 Drives 80x25 CGA
Bits 3 Display
Enabled
0 Disabled
1 Enabled
Bit 2 Keyboard
Enabled
00
Not CGA or MDA 01 40x25 CGA
01
2 Drives 80x25 CGA
Bit 1 Math
Coprocessor
Installed
0 Absent
1 Present
Bit
0
Floppy Drive Installed
0 Disabled
1 Enabled
15h
Base Memory (in 1KB increments), Low Byte
16h
Base Memory (in 1KB increments), High Byte
17h
IBM-compatible memory (in 1KB increments), Low Byte
18h
IBM-compatible memory (in 1KB increments), High
Byte (max 15 MB)
19h-2Dh Varies
2Eh
Standard CMOS RAM checksum, high byte
2Fh
Standard CMOS RAM checksum, low byte
30h IBM-compatible
Extended
Memory, Low Byte (POST) in
KB
31h IBM-compatible
Extended
Memory, High Byte (POST)
in KB
32h Century
Byte
33h
Reserved. Do not use
34h
Reserved. Do not use
35h
Low byte of extended memory (POST) in 64 KB
36h
High byte of extended memory (POST) in 64 KB
37h-3Dh Varies
3Eh
Extended CMOS Checksum, Low Byte (including 34h-
3Dh)
3Fh
Extended CMOS Checksum, High Byte (including 34h-
3Dh)
Summary of Contents for FP8100 Series
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