 Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me. |
Forum Index : Microcontroller and PC projects : CMM2 - HDMI and HiRes options
| Author | Message | ||||
rrroonn Newbie  Joined: 08/02/2026 Location: AustraliaPosts: 4 |
Hi, Has anyone had experience with running at 1080p on CMM2 Gen2 (or similar)? Does it work reliably in RGB888 or RGB565? Is this with HDMI/DVI or VGA. It seems marginal for the system based on memory bandwidth, so I was interested to how it performs in real-life. I am tinkering with a design that hopes to put out 1080p via HDMI (video only) and trying to understand the real limitations. Thank you in advance! Ron If all else fails, remain flexible and maintain a sense of humour |
||||
| PhenixRising Guru  Joined: 07/11/2023 Location: United KingdomPosts: 1727 |
I'm also curious because I only have Gen 1. It's frustrating that we get these video modes and it's assumed that users are only interested in low-res retro games and so those are the demos that we get. I am more interested in large, smooth text fonts, etc.  |
||||
| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10963 |
Sometimes I wonder why we write manuals  CMM2 manual page 93 |
||||
| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 1727 |
Page 93, read it many times: GUI BITMAP HELP HUMID I2C ????? |
||||
disco4now Guru Joined: 18/12/2014 Location: AustraliaPosts: 1094 |
MODE command, page 108 the latest beta manual. F4 H7FotSF4xGT |
||||
| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 1727 |
Oh sure but the OP asked: I'm also interested because I only have Gen1 |
||||
Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8560 |
The CMM2 Gen2 only can generate VGA at 1920x1080 (Mode 16). This is a HD resolution and VGA is an analogue system unlike HDMI which is digital. The display quality will depend a lot on the VGA connection (i.e. the length and quality of the lead) and the capabilities of the display. The RP2350 in the Pico 2 uses a special on-chip high speed parallel data transmit module called the HSTX to generate the HDMI/DVI signals in hardware. I'm unsure whether anything else would be fast enough to reach 1080P, even the CMM2, so I think you'd be limited to VGA. . Edited 2026-02-17 21:05 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
||||
| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10963 |
As per the manual 1080P only works in RGB332. This is entirely because of bus bandwidth limitations. 1080P RGB332 has a data rate of 1.19Gbits/second |
||||
| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 4241 |
Just to fill in about the manual... Colour_Maximite_2_User_Manual.pdf has just one 1080 size: Mode 16 says G2 only It shows only 8-bit for mode 16 and thus RGB332. I hope I've understood the manual :) edit: just saw some more replies as I typed... oh well John Edited 2026-02-17 21:22 by JohnS |
||||
| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 1727 |
Things you'd never expect to read in a BASIC programming manual  |
||||
 Print this page |
 |
The Back Shed's forum code is written, and hosted, in Australia. | © JAQ Software 2026 |
