Commodore Amiga A500 Technical Reference Manual page 181

COMMAND
DESCRIPTION
Read Drive Status(Class
0, Opcode 0)
Restore (Class 0,
Opcode 1)
All commands executed by the HDC are summarized in the table be-
low. Fields of the command block not specified are don't cares. Fol-
lowing this summary is a generalized description of the commands.
Table 5-6. Command Summary
Command Class
Description Opcod
Read Drive Status 00
Restore to TKO 01
Request Status 03
Check Trk Fmt 05
Format Track 06
Read Drive 08
Write Drive 0A
Seek 0B
Set Drive Param. 0C
Change Command 0F
Block Address/
Read Drive Long E5
Write Drive Long E6
Init Unit 1 CC
R = 0 Retries/ECC enable
= 1 Retries/ECC disabled
L = Logical Sector Address
Read Drive Status (RDS) = 02, 03, 04, 20, 32
Illegal Disk Access (IDA) = 20, 21, 22, 32
Read Sector Error (RDE) = 11, 12, 13, 14, 15
Action
Read the drive's status and determine if drive is ready. For Hard
disk drives supporting buffered seeks this command is useful for
determining the first drive to reach its target track. The command
will be aborted, if the drive status read is incorrect
Possible Error Codes
No error, invalid command, seek in progress, drive not ready, write
fault, DMA error.
Action
178
LUN LADD Int/ Control
Num (21) BCNT Options
0-1
0-1
0-1
0-1 L
0-1 L B
0-1 L B R, S RDE, RDS, IDA
0-1 L B R, S 15,19,RDS,IDA
0-1 L
0-1
0-1 L B R, S RDE, RDS, IDA
0-1 L B R, S 15,19,RDS,IDA
1
S = 0 Set correction span to 5 bits
= 1 Set correction span to 11 bits
B = Block or sector count required
Possible
Error Codes
RDS
06, RDS
Last Oper.
R RDE, RDS, IDA
S IDA
RDS, IDA
20, 32
20, 32
20, 32