ZiLOG System 8000 Hardware Reference Manual page 263

HRM
C
D
E
F
FRD
RLONG
READ
SIZE
Zilog
Write data
Parameters: UN,CT,AH,AL,CY,HD,SC
Format Read track (controller reads
and transmits sector IDs; CT is
#
sector IDs to read).
Parameters: UN,CT,AH,AL,CY,HD,SC
Read Long (controller reads data
and 4 bytes of ECC)
Parameters: UN,CT,AH,AL,CY,HD,SC
Read data
Parameters: UN
Size Disk if formatted (controller
returns size in CY, HD, SC fields;
returns bad ending status if it
cannot size disk.)
HRM
CM:NO
CM:NE
CM:NR
ST:ES
Code
No offsets during retries
No Error Correction
No Retries; Use data in CM:OF for strobe timing
Packet Command Ending Status:
Name and optional description
o
No Error OR Soft Error
(NOTE: if ES
=
0, but any of SB bits
are set, there was a SOFT error; if
ES
=
0 and all S8 bits are clear,
NO error occurred.)
Initialization error
Initialization sequence incomplete
2 Sector Overrun
3 DMA Error - Memory Parity Error
(NOTE: in case of a DMA Error,
controller does NOT update packet;
only status Register will have
this code in ES field)
4 Select Error - 0 drives or multiple drives
selected
5 Byte/Sec Count Error -
Odd
byte count or
sector count
=
0
6 Dual-Access Busy Err
7
Rezero error - A rezero did not clear fault
8
Drive status - One or more bad SMD status
bits in DS
9
Odd
DMA Address
10 Pack Overflow
11 Power Fail Detected
12 Invalid Packet Command - CM:PCMD invalid
13 Hard Data Error - Data error was unrecovered
A-32 Zilog
A-32