mirror of
https://github.com/Oibaf66/frodo-wii.git
synced 2024-11-10 21:55:11 +01:00
283 lines
7.4 KiB
HTML
283 lines
7.4 KiB
HTML
|
<HTML>
|
||
|
|
<HEAD>
|
||
|
|
<TITLE>SAM</TITLE>
|
||
|
|
</HEAD>
|
||
|
|
<BODY>
|
||
|
|
|
||
|
|
<H1>SAM</H1>
|
||
|
|
|
||
|
|
<CITE>
|
||
|
|
"Frodo! Mr.Frodo, my dear!" cried Sam,<BR>
|
||
|
|
tears almost blinding him. "It's Sam, I've come!"
|
||
|
|
</CITE>
|
||
|
|
|
||
|
|
<HR>
|
||
|
|
|
||
|
|
Frodo has a built-in machine language monitor that can be activated at any
|
||
|
|
time by pressing F9 (Unix) or selecting the appropriate menu item (BeOS/AmigaOS/MacOS):
|
||
|
|
SAM (Simple Assembler and Monitor). It provides full access to the memory
|
||
|
|
and hardware of the emulated C64 and 1541 (under BeOS, you must only start
|
||
|
|
SAM if you launched Frodo from the Shell).<P>
|
||
|
|
|
||
|
|
SAM is controlled by a command-based interface, all numbers are in hex.
|
||
|
|
With the command "h" you can display a list of all commands. The command
|
||
|
|
"x" quits SAM and returns to Frodo.<P>
|
||
|
|
|
||
|
|
SAM has two modes of operation, indicated by the prompt "C64>" or "1541>".
|
||
|
|
You can switch between them with the "64" and "1541" commands. In "C64"
|
||
|
|
mode, all commands that access memory or the CPU operate on the memory/CPU
|
||
|
|
of the emulated C64. In "1541" mode, they operate on the emulated 1541
|
||
|
|
(this is only useful if the processor-level 1541 emulation is turned
|
||
|
|
on).<P>
|
||
|
|
|
||
|
|
All commands that access the C64 memory use the memory configuration set
|
||
|
|
with the "k" command. On starting up SAM, the configuration is set to the
|
||
|
|
one the processor is in. Accesses from within SAM have the same effect as
|
||
|
|
accesses of the emulated processor. This affects especially the I/O
|
||
|
|
registers: a memory dump of $dc00-$de00 clears pending CIA interrupts as
|
||
|
|
SAM reads from $dc0d and $dd0d. With the "v" commands, you can examine the
|
||
|
|
state of the I/O chips without modifying the state of the emulation.<P>
|
||
|
|
|
||
|
|
In all places where SAM expects a number (except in the assembler) you can
|
||
|
|
also enter an expression of hex numbers containing '+', '-', '*', '/' and
|
||
|
|
parens. Commands that create a longer output can be interrupted with
|
||
|
|
Ctrl-C.<P>
|
||
|
|
|
||
|
|
Here is a description of all commands ('[]' marks a parameter than can be
|
||
|
|
left out, '{}' marks a parameter that can be repeated many times. If a
|
||
|
|
[start] parameter is left out, SAM continues at the address where the last
|
||
|
|
command stopped):<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
a [start] Assemble
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
starts the assembler at the address "start". SAM always prints the address
|
||
|
|
where the next instruction will be written to. The syntax of the
|
||
|
|
instructions conforms to the standard except for shift/rotation
|
||
|
|
instructions in the "accumulator" addressing mode. Those have to be entered
|
||
|
|
without operand, e.g. "lsr" instead of "lsr a". Entering a blank line quits
|
||
|
|
the assembler and returns to the command mode of SAM.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
b [start] [end] Binary dump
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
displays the memory from "start" to "end" byte-wise binary. With this
|
||
|
|
command, you can view character sets.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
c start end dest Compare memory
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
compares the memory in the range from "start" to (and including) "end"
|
||
|
|
with the memory at "dest". The addresses of all different bytes and the
|
||
|
|
total number of differences (decimal) are printed.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
d [start] [end] Disassemble
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
disassembles the memory from "start" to "end". Undocumented opcodes are
|
||
|
|
markes with a star '*'.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
e Show interrupt vectors
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
shows the currently active interrupt vectors of the 6510 (C64) or 6502
|
||
|
|
(1541) and (in C64 mode, if the Kernal ROM is mapped in) of the Kernal.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
f start end byte Fill memory
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
fills the memory in the range from "start" to (and including) "end" with
|
||
|
|
the value "byte".<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
i [start] [end] ASCII/PETSCII dump
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
shows the memory from "start" to "end" as ASCII/PETSCII characters.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
k [config] Show/set C64 memory configuration
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
"k" without parameters shows the memory configuration that is set for SAM,
|
||
|
|
"k" with parameter modifies it. On exiting SAM, the configuration set with
|
||
|
|
the processor port is reactivated. The memory configuration has no effect
|
||
|
|
in 1541 mode. The 8 possible configurations are:
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
# $a000-$bfff $d000-$dfff $e000-$ffff
|
||
|
|
----------------------------------------
|
||
|
|
0 RAM RAM RAM
|
||
|
|
1 RAM Char ROM RAM
|
||
|
|
2 RAM Char ROM Kernal ROM
|
||
|
|
3 Basic ROM Char ROM Kernal ROM
|
||
|
|
4 RAM RAM RAM
|
||
|
|
5 RAM I/O RAM
|
||
|
|
6 RAM I/O Kernal ROM
|
||
|
|
7 Basic ROM I/O Kernal ROM
|
||
|
|
|
||
|
|
</PRE>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
l start "file" Load data
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
loads the contents of the specified file into memory starting from address
|
||
|
|
"start". The file name must be enclosed in quotation marks even if it
|
||
|
|
contains no spaces. This command cannot be used to load C64 programs as
|
||
|
|
it doesn't respect the embedded load address in the programs.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
m [start] [end] Memory dump
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
displays the memory from "start" to "end" as hexadecimal numbers and ASCII
|
||
|
|
characters.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
n [start] [end] Screen code dump
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
displays the memory from "start" to "end" as ASCII characters, interpreting
|
||
|
|
each byte as a screen code of the standard character set.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
o ["file"] Redirect output
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
When a file name is specified, all following output is redirected to this
|
||
|
|
file. The file name must be enclosed in quotation marks even if it contains
|
||
|
|
no spaces. Entering "o" without parameters closes the file and directs the
|
||
|
|
output into the window of SAM again.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
p [start] [end] Sprite dump
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
displays the memory from "start" to "end" binary with three bytes per line.
|
||
|
|
With this command, you can display sprite data.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
r [reg value] Show/set CPU registers
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
"r" without parameters shows all 6510 (C64) or 6502 (1541) registers and
|
||
|
|
flags and the instruction at the address specified by the program counter.
|
||
|
|
For the 6510, "DR" and "PR" are the data direction register and data
|
||
|
|
register of the processor port. To modify a register, give its name ("reg")
|
||
|
|
and the new value ("value") as parameters.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
s start end "file" Save data
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
writes the memory from "start" to (and including) "end" to the specified
|
||
|
|
file. The file name must be enclosed in quotation marks even if it contains
|
||
|
|
no spaces. This command cannot be used to save C64 programs as it doesn't
|
||
|
|
save a load address in the file.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
t start end dest Transfer memory
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
transfers the memory from "start" to (and including) "end" to "dest".
|
||
|
|
Source and destination may overlap.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
vc1 View CIA 1 state
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
shows the state of CIA 1 ($dc00).<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
vc2 View CIA 2 state
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
shows the state of CIA 2 ($dd00).<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
vf View floppy state
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
shows the state of the processor-level 1541 emulation.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
vs View SID state
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
shows the state of the SID.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
vv View VIC state
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
shows the state of the VIC.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
x Return to Frodo
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
quits SAM and returns to Frodo.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
: addr {byte} Modify memory
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
writes the space-separated values "byte" into memory starting at "addr".<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
1541 Switch to 1541 mode
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
switches to 1541 mode. All commands that access memory or the CPU will then
|
||
|
|
operate on the emulated 1541 (processor-level).<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
64 Switch to C64 mode
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
switches to C64 mode. All commands that access memory or the CPU will then
|
||
|
|
operate on the emulated C64.<P>
|
||
|
|
|
||
|
|
|
||
|
|
<PRE>
|
||
|
|
? expression Calculate expression
|
||
|
|
</PRE><P>
|
||
|
|
|
||
|
|
calculates the value of the given expression and displays it in decimal
|
||
|
|
and hexadecimal.<P>
|
||
|
|
|
||
|
|
</BODY>
|
||
|
|
</HTML>
|