====== PSYMON 1.20B ======
{{:tandy_color_computer:psymoncoco.png?direct&400|PSYMON 1.20B starting to run on CoCo}}

The original Psymon was used on Motorola EXORcisor boards in the 1970s and it 
loads and runs from FC00 with only the MPU vectors reserved.

===== INSTRUCTIONS, SOURCE, LICENSE =====
{{ :tandy_color_computer:percom_psymon_6809_monitor.pdf |}}

===== ASSEMBLER SOURCE =====
{{:tandy_color_computer:psymon120b.zip}}

Contains PSYMON120B.s assembly source code and Percom_PSYMON_6809_Monitor.pdf documentation containing the original source code listing.

===== ASSEMBLING PSYMON =====
Download or setup William "lostwizard" Astle's [[http://www.lwtools.ca/|LWTools]] \\

Example assembly command, assuming the source is saved as PSYMON120B.s
  lwasm -9 -f raw --list=PSY120B.txt --symbols=PSY120B-sym.txt -o PSY120B.BIN PSYMON120B.s
This will give you a 1KiB raw binary output file.

For a Motorola S-record format used by some tools:
  lwasm -9 -f srec -o PSY120B.srec PSYMON120B.s

For an Intel hexdump format used by some tools:
  lwasm -9 -f ihex -o PSY120B.ihex PSYMON120B.s

===== COCO ARCHIVE CONTRIBUTION =====
The version I uploaded to the Color Computer Archive contains the original source from the PDF for historical / archival purposes.

I also included additional modified versions for the Color Computer 1, 2, and 3 as well.

[[https://colorcomputerarchive.com/repo/Programming/Source/PSYMON%20-%20Percom%206809%20System%20Monitor/PSYMON120B.zip]]

===== COCO MODIFICATIONS =====
The CoCo1/2 version loads and runs Psymon at $6C00 so its for a 32K CoCo - but 
could be moved much lower for 16K or 4K. It's probably best to run 
CLEAR 200,&H6C00 before LOADM so that its protected from BASIC itself.

The CoCo3 version is sneakier - it loads in at $FC0A and uses RAM at $FE69 so 
that it can be co-resident with Super Extended BASIC without conflict rather 
than taking away a bit of the BASIC workspace RAM.

Both of these use the POLCAT and CHROUT ROM routines for simplicity as a quick port.

Providing standalone keyboard and screen output console drivers is left as an exercise for the reader.
===== SEE ALSO =====
[[http://www.robomargo.com/percom/|Percom Data Corp 1976 - 1986]] \\
[[https://archive.org/details/percom-dealer-signup-package-1979|Percom Dealer Signup Package - PSYMON ROM listed page 11]] \\

===== RTS =====
Return to [[:Tandy Color Computer:]]