Commodore Computers 1581 - 1581 Disk Drive General Specifications; Disk Technical Specifications

1581 SERVICE MANUAL
GENERAL SPECIFICATIONS
1 CHARACTERISTICS
A) 3.5 inch, +800K storage
B) Increased buffers, fixed BAM locations
C) Expanded controller commands
D) Track cache buffer
E) Configurable auto boot file
F) User alterable physical/logical track and sector translation
G) Fully vectored jump table
H) Partition capabilities
I) Wild card enhancements
J) Standard, fast and burst serial capabilities
K) Expanded burst command set
2 HARDWARE SUMMARY
PROCESSORS: 6502A, WD1770
ROM: 32K
RAM: 8K
I/O: 8520A
3 SPECIFICATIONS
GROSS DATA ORGANIZATION:
3.5 Inch Disk
Double-Sided
80 Cylinders/160 Tracks
PER TRACK ORGANIZATION:
Hex 4E written as a gap, with 10 sectors of data, with full gaps written for motor
speed variation.
PER SECTOR ORGANIZATION:
MFM Encoding
12 Bytes of 00
3 Bytes of Hex A1 (Data Hex A1, Clock Hex 0A)
1 Byte of FE (ID Address Mark)
1 Byte (Track Number)
1 Byte (Side Number)
1 Byte (Sector Number)
1 Byte (Sector Length, 02 for 512 Byte Sectors)
2 Bytes CRC (Cyclic Redundancy Check)
22 Bytes of Hex 22