Aliexpress RP2350A board

Author	Message
fred777 Regular Member Joined: 01/07/2021 Location: United Kingdom Posts: 81	Posted: 03:51pm 04 May 2026       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 Guru Joined: 05/10/2019 Location: United Kingdom Posts: 8877	Posted: 06:58pm 04 May 2026       Is it 2.54 mm or 2mm pitch? Those holes look a little close to me.
PhenixRising Guru Joined: 07/11/2023 Location: United Kingdom Posts: 1937	Posted: 07:25pm 04 May 2026       Does it overclock?
Mixtel90 Guru Joined: 05/10/2019 Location: United Kingdom Posts: 8877	Posted: 08:59pm 04 May 2026       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. :(
fred777 Regular Member Joined: 01/07/2021 Location: United Kingdom Posts: 81	Posted: 08:08am 05 May 2026       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 Guru Joined: 05/10/2019 Location: United Kingdom Posts: 8877	Posted: 09:17am 05 May 2026       Thanks for the info. :)
fred777 Regular Member Joined: 01/07/2021 Location: United Kingdom Posts: 81	Posted: 09:26am 05 May 2026       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 Guru Joined: 11/12/2012 Location: United Kingdom Posts: 11435	Posted: 10:18am 05 May 2026       GP0, 8 is the default keyboard or com port depending on version
fred777 Regular Member Joined: 01/07/2021 Location: United Kingdom Posts: 81	Posted: 10:37am 05 May 2026       Right, GP0 it is. I rewired the cs pin using my good old wire wrap tool, and now the hdmi pins are free. Thanks!