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5
Debugger
This section gives a quick guide to using the ROM debugger. Note that this
code operates differently than, for example, ZSID.
5.1
Help Function
Entering "?" at a command prompt will display the help screen:
C O M M A N D
Separate all fields by one or more blanks
Commands Available:
: <Intel hex.>
Input line of Intel hex-format data
?
Display this help
B [addr [count]] Set/clear breakpoint
D addr [length]
Display/change memory
G [addr]
Go run program (from addr)
I port
Input & display byte from port
N [count]
Run (next N) instructions
O port data
Output data byte at port
R [register name] Display/change user registers
Z
Boot First Available Device
Z 1
Z 2
Z 3
S
Setup DS-1302 RAM Parameters
T
Display Date/Time
T S
L
Load OS (First Available) and return to DEBUG
L 1
L 2
L 3
The input-line editor includes support for Tab (tabstops are fixed at every 8
columns) and Backspace, which is destructive, ie it echos backspace - space -
backspace to the terminal.
Do not forget to enter at least one space after the command letter: else the first
command argument will be skipped. The only exception to the spaces-between-
fields rule is the Intel hex-format input: this follows the Intel conventions, and
must have no spaces between fields.
H E L P
Boot from Floppy Drive 0
Boot from SCSI, Unit 0
Boot from GIDE, Master
Set Date/Time
Load from Floppy Drive 0
Load from SCSI, Unit 0
Load from GIDE, Master
20
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