IBM 5170 Technical Reference page 73

0001 through 1111 define type 1 through type 15
(see BIOS listing at label FD_TBL).
The following figure shows the BIOS fixed disk parameters.
Type Cylinders
Heads
1 306 4 128 305
2 615 4
300
615
3 615 6
300
615
4
940 8 512 940
5 940
6 512 940
6
615
4 no 615
7
462 8 256 511
8 733 5 no 733
9 900 15 n08 901
10 820
3 no 820
855
855
319
733
11 855
5 no
12 855 7 no
13 306
8
128
14 733 7
no
15 Reserved--set to zeros
Write Landing
Pre-camp Zone
BIOS Fixed Disk Parameters
~,
Hex address 13 contains a reserved byte.
Equipment Byte (Hex 14)
Bit 7-Bit 6 Indicates the number of diskette drives installed:
00 1 drive
10 Reserved
01 2 drives
11 Reserved
Bit 5-Bit 4 Primary display
00 Reserved
System Board 1-51