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Forum Index : Microcontroller and PC projects : CMM2: How many COM ports

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PhenixRising
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Joined: 07/11/2023
Location: United Kingdom
Posts: 1716
Posted: 04:51pm 11 Feb 2026
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Available on the expansion header?
 
Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 8525
Posted: 05:18pm 11 Feb 2026
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Both of them. :)

pin 8 - com1 tx
pin 10 - com1 rx
pin 16 - com 2 tx
pin 11 - com 2 rx
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
PhenixRising
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Joined: 07/11/2023
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Posts: 1716
Posted: 08:23pm 11 Feb 2026
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[Homer Simpson voice] DOH!!! It's right there on geoffg.net 😁

But cheers, Mick 👍😎👍
 
PhenixRising
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Posted: 09:40pm 11 Feb 2026
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Mick, just so you know....I have more of a comprehension issue than you do. You're a  veritable MM-database.  

Now I just need a simple yay or nay; Is there no way for my CMM2 to boot into a program with no SD present?

This is my only hesitation for using this product.
 
Mixtel90

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Posted: 07:55am 12 Feb 2026
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Yes, but not in the same way as the Pico. It likes to be a bit different. :)

OPTION FLASH [n]
specifies that the program will run from flash, not RAM. n sets the program start position so you can have multiple programs stored in flash.

OPTION RAM
specifies that the program will run from RAM, not flash.

OPTION AUTORUN ON/OFF
If the CMM2 is set to run programs from flash this runs the current program that's in flash on power up or on a restart. It is switched off by NEW.
If the CMM2 is set to run programs from RAM then this looks for AUTORUN.BAS on the SD card and runs it.

I can recommend the CMM2, it's a beast! I only have the G1 version though.
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
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