Commodore 1581 - CMD 8: Dump Track Cache Buffer; Chgutl Utility

PROTOCOL: Burst handshake (W= 1), conventional (W=0)
CONVENTIONS: This is a method of reading or writing current status, and changing
the status mask value.
OUTPUT: None (W = 0), Burst status byte (W = 1)
CMD 8—DUMP TRACK CACHE BUFFER
BYTE BIT 7 6 5 4 3 2 1 0
00
01
02
03
0
0
F
1
0
s
PIIYSICAI
0
1
X
-TRACK
1
1
1
0
0
1
1
0
1
0
0
0
1
0
1
SWITCHES: X—don't care
S—side select
F—(1 = write even if not "dirty")
CHGUTL UTILITY
BYTE BIT 7 6 5 4
00
01
02
03
04
0
0
X
1
0
X
0
1
X
1
1
1
UTILITY COMMANDS: 'B\
COMMAND PARAMETER
0
0
1
\S\ §R\ T,
1
0
1
V, #DEV,
0
0
1
"MR",
1
0
0
"MW"
SWITCHES: X—don't care
UTILITY COMMANDS: lB'—serial bus mode
'S1—DOS sector interleave
§R — DOS retries
T—ROM signature analysis
V—verify select
#DEV—device #
Note: Byte 02 is equivalent to '>'.
EXAMPLES: "U0>Bl" = Fast Serial, "U0>B0" = Slow Serial
"U0>S" + CHR$ (SECTOR INTERLEAVE)
"U0>R" + CHR$ (RETRIES)
"U0>T" (If the ROM signature failed, the activity LED blinks 4 times)
"U0>V0" = Disk Verify ON, "U0>Vl" = Disk Verify OFF
"U0>" + CHR$(#DEV), where #DEV = 4-30
"U0>MR" + CHR$ (>memory address) + (# of pages)*
"U0>MW" + CHR$ (>memory address) + (# of pages)*
*Burst memory read and memory write use standard burst protocol (without status
byte).
95