Tools to communicate with and upload code to physical PDP11 connected via RS232.
- lst2deposit - creates a SIMH deposit file from a MACRO11 LST file
- pdpcom - allows to upload deposit file content to a serial attached PDP11
- arthur-gill-examples - some nice examples
- examples - some simple examples
See sub projects readme files, lst2deposit/README.md and pdpcom/README.md
See sub projects readme files, lst2deposit/README.md and pdpcom/README.md
Small video clip where I list some memory content, load an object file, show that is has been loaded to memory and execute it (this simple object file waits for a single char and prints it to console):
See directory arthur-gill-examples for examples I typed in from Arthur Gills great book.
See arthur-gill-examples/Makefile on how to use it.
Some other random Macro11 examples are in macro11-examples.
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MACRO-11 assembler for Linux - https://github.com/andpp/macro11
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MACRO-11 assembler manual - http://www.bitsavers.org/www.computer.museum.uq.edu.au/RSX/AA-V027A-TC%20PDP-11%20MACRO-11%20Language%20Reference%20Manual.pdf
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Octal/HEX/DEC/* online calculator - https://www.rapidtables.com/convert/number/hex-dec-bin-converter.html
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ASCII Code table - https://www.physics.udel.edu/~watson/scen103/ascii.html
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Machine and Assembly Language Programming of the PDP-11, Arthur Gill, Prentice-Hall, 1978. This book was written by Arthur who gave lessons on University of Berkeley. A very nice book for studying PDP-11 assembler. Used prints can still be found.
There are some differences in writiung down assembler code between the original MACRO11 dialect and the Gnu Assembler dialect.
Some of them I found and did notice them here.
| MACRO11 | GAS | Meaning |
|---|---|---|
| MOVB ITIME,R0 | movb *$itime,r0 | Read content at address ITIME |
| BIC #177760,R0 | bic $0177760,r0 | Literal (octal) value 0177760 |
| MOV #MESSG,R0 | mov $messg,r0 | Literal value (here: address of some label) |
Default number system (number without any modifier) for MACRO11 is octal. Default number system (number without any modifier) for GAS is decimal.
| MACRO11 | GAS | Meaning |
|---|---|---|
| #12. | $12 | Decimal number 12 |
| #12 | $012 | Octal number 12 |
in MACRO11 we can write:
LC=.
.=4+LC
.WORD 6,0,12,0 ; INITIALIZE ERROR VECTORS
This would put 6,0,12,0 values to address 4,6,8,10 if "." points to address 0. In GAS, the value "." comes from outside and may have any value. I do not know how to do a valid set up there. For now, I usually change the MACRO11 code to something like this:
vecs: mov $6,*$4 # initialize error vectors
mov $0,*$6
mov $012,*$010
mov $0,*$012
And that piece of code comes to the start section of the code. So instead of initializing the memory during loading the binary code, it will be initialized on startup of the code.