Zoom meeting Topic suggestion: How to rebuild/install CPM after a BIOS change

[Joseph Corda]

Greetings
Looking for quick overview on the steps I need to rebuild(or patch) CP/M 2.2 and install in boot track after I have modified and assembled a new BIOS.  

As an example ..
I'm currently using Mike D's Serial CP/M 2.2 (see link below) and I would like to modify BIOSSER.ASM to support a Cromemco PRI card (Port J1 ports 53H/54H) for printing from CP/M.

Once BIOS is adjusted and assembled into a ROM/BIN file how do I do the following:

• Take newly assembled BIOS and "patch" into the rest of CP/M
• How to I get newly rebuilt/patched CP/M installed back onto boot track ?
• Are there any different steps between using Serial CP/M and a disk based CP/M version?

Thanks
Joe 

Using Source from here:
https://deramp.com/downloads/altair/software/8_inch_floppy/CPM/CPM%202.2/Serial%20Disk%208Mb%20CPM%202.2%20(thru%2088-2SIO)/

[Joseph Corda]

Ah...Never mind.. I should have read the BIOSSER.ASM file as Mike D spelled it out !

;    To patch changes made to this BIOS into a CP/M image saved from
;    MOVCPM (e.g., CPMxx.COM), use following commands:
;
;       A>DDT CPMxx.COM
;       -IBIOS.HEX
;       -Rxxxx      (where xxxx = BIAS computed below)
;       -G0         (Go zero, not "oh")
;       A>SYSGEN

[Patrick Linstruth]

Yep, notes are at the top.

I just did this just the other day making a Serial CP/M for Interfacer 1.

Easy-PZ with the simulator.

There are some issues with using host serial ports with the Altair8800 (and probably AltairZ80). I am currently working on a complete re-write of that system.

SIMH makes it very difficult, if not impossible, to do anything above 9600 and not completely consume the host CPU.

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