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Forum Index : Microcontroller and PC projects : picomite usb and the giga r1

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tenij000
Newbie

Joined: 30/05/2025
Location: Netherlands
Posts: 16
Posted: 10:11pm 11 Jun 2025
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i connected the giga r1 to my picomite usb version

pico                    giga

vbus           5v
gnd            gnd
GP8 (pin 11) TX RX1 (pin 15)
GP9 (pin 12) RX TX1 (pin 14)

how do read the inc whit mmbasic
Edited 2025-06-12 10:38 by tenij000
 
Mixtel90

Guru

Joined: 05/10/2019
Location: United Kingdom
Posts: 7783
Posted: 06:49am 12 Jun 2025
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Input voltage to the Giga is 6V to 24V but it uses 3V3 logic.
Input to the Pico is 2.7V to 5.6V and it uses 3V3 logic.
Your logic levels are fine but be careful how you power them as both supplies should be switched at the same time. If one is powered before the other then the GPIO ports could potentially be damaged. I would put 1K resistors in series with each of the signal lines for safety.

By default on a standard PicoMite GP8 and GP9 are dedicated to COM2 for connecting a PS2 keyboard. You will have to use OPTION KEYBOARD OFF to allow those pins to be used for anything else.

Appendix A of the PicoMite manual has a lot of information on how to configure and use the COM ports. I can't give further information here because I've no idea how you work with a Giga R1. You are going to have to write some sort of a program for both machines so that they can communicate.
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
tenij000
Newbie

Joined: 30/05/2025
Location: Netherlands
Posts: 16
Posted: 08:17am 12 Jun 2025
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i use the 5v pin of the giga to vbus of the pico but need a power suply 5v gone get 1 if get my vga pcb made 1 but thakes long till gone ship it to me :(
Edited 2025-06-12 18:20 by tenij000
 
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