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Forum Index : Microcontroller and PC projects : Aliexpress RP2350A board

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fred777
Regular Member

Joined: 01/07/2021
Location: United Kingdom
Posts: 75
Posted: 03:51pm 04 May 2026
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Hello,

I can report that this board runs fine with MMBASIC. It comes with 8MB PSRAM on board and was just 5€ on Aliexpress. PSRAM pin is GP19:
OPTION PSRAM PIN GP19

It is one of the few boards with PSRAM and DIP formfactor, although its almost square


Edited 2026-05-05 01:54 by fred777
 
Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 8805
Posted: 06:58pm 04 May 2026
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Is it 2.54 mm or 2mm pitch? Those holes look a little close to me.
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
PhenixRising
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Joined: 07/11/2023
Location: United Kingdom
Posts: 1877
Posted: 07:25pm 04 May 2026
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Does it overclock?
 
Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 8805
Posted: 08:59pm 04 May 2026
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PSRAM on GP19 is a pain. You can't have HDMI if it's hard-wired 'cos GP19 is HSTX7 pin. Not a great bit of design. :(
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
fred777
Regular Member

Joined: 01/07/2021
Location: United Kingdom
Posts: 75
Posted: 08:08am 05 May 2026
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The pitch is 2.54 - it fits on a breadboard.
Yes, PSRAM on GP19 sucks. It does seem to overclock well, 384Mhz (maximum with PSRAM) looks stable so far.
 
Mixtel90

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Joined: 05/10/2019
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Posts: 8805
Posted: 09:17am 05 May 2026
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Thanks for the info. :)
Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs
 
fred777
Regular Member

Joined: 01/07/2021
Location: United Kingdom
Posts: 75
Posted: 09:26am 05 May 2026
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I've just heated up an lifted PIN1 on the PSRAM chip...
What is the better pin for the PSRAM chip GP0 or GP8?
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 11273
Posted: 10:18am 05 May 2026
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GP0, 8 is the default keyboard or com port depending on version
 
fred777
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Joined: 01/07/2021
Location: United Kingdom
Posts: 75
Posted: 10:37am 05 May 2026
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Right, GP0 it is. I rewired the cs pin using my good old wire wrap tool, and now the hdmi pins are free.
Thanks!
 
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