Posted: 03:51pm 04 May 2026 Copy link to clipboard
fred777 Regular Member
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
Posted: 06:58pm 04 May 2026 Copy link to clipboard
Mixtel90 Guru
Is it 2.54 mm or 2mm pitch? Those holes look a little close to me.
Posted: 07:25pm 04 May 2026 Copy link to clipboard
PhenixRising Guru
Does it overclock?
Posted: 08:59pm 04 May 2026 Copy link to clipboard
Mixtel90 Guru
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. :(
Posted: 08:08am 05 May 2026 Copy link to clipboard
fred777 Regular Member
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.
Posted: 09:17am 05 May 2026 Copy link to clipboard
Mixtel90 Guru
Thanks for the info. :)
Posted: 09:26am 05 May 2026 Copy link to clipboard
fred777 Regular Member
I've just heated up an lifted PIN1 on the PSRAM chip... What is the better pin for the PSRAM chip GP0 or GP8?
Posted: 10:18am 05 May 2026 Copy link to clipboard
matherp Guru
GP0, 8 is the default keyboard or com port depending on version
Posted: 10:37am 05 May 2026 Copy link to clipboard
fred777 Regular Member
Right, GP0 it is. I rewired the cs pin using my good old wire wrap tool, and now the hdmi pins are free. Thanks!
