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Forum Index : Microcontroller and PC projects : It's Alive!
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 8296 |
Many, many thanks Geoff and Peter (and all the other contributors) for all your hard work - the CMM2 is amazing! If anyone is still looking at getting one of these then, in the UK at least, it will probably cost a bit more to build one from your own sourced components than to buy one pre-built or as a kit. That was my experience anyway. You may have to wait but you'll probably save money. Of course, I wouldn't listen to my own advice would I? The problem is in finding suppliers that can supply what you want without handling & carriage charges inflating the price out of all proportion. e.g. RS are fine for those listed components (although I had to use an alternative IO connector), but they don't sell the case. Farnell sell the case but it works out expensive unless you are ordering a lot of other stuff. I found a case on ebay that was a lot cheaper than those advertisers that had the model number quoted and it was identical. I also found a PCB on ebay, but that supplier has now increased their price. The Waveshare module came from Waveshare's outlet on Amazon at UKP35.99 including vat & carriage. The 40-pin connectors I decided to source from China as they were much cheaper than anywhere I could find in the UK. Of course, that went wrong and I got the wrong item first time round! Aligning them into the holes required a little dexterity, but after that I had no problems with construction. I'm still not sure whether it might not have been easier to fit the SD card socket first though. Of course, with my typical luck, I got a Waveshare board with a dicky oscillator. Then ran into the problem of getting an oscillator module in the UK at a reasonable price. I managed to get 2 (minimum quantity) for UKP2.40 from China (generic, not the same part number). All the modes seem to be working well now - in fact, even mode 1,8 seems to be sharper too. I left the crystal on the Waveshare board. Not sure if I should remove it. Fiddly to fit the oscillator, but I managed it. The capacitor is actually a size down (it's what I had) but it went in ok. As an additional annoyance I couldn't get a CR1220 battery locally! ebay to the rescue again. Anyway, I'm happy as a pig in **** now! It's a great little computer and the manuals are very good too. (Why doesn't this forum like the UK pound sign?) Edited 2021-03-28 01:34 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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RetroJoe Senior Member  Joined: 06/08/2020 Location: CanadaPosts: 290 |
Congrats on the homebrew build! All "special" characters (i.e. > ASCII 127) are verbotten in the Forum, including curly quotes, so turn those off in your browser or OS. Edited 2021-03-28 03:35 by RetroJoe Enjoy Every Sandwich / Joe P. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8296 |
If it was greater than ASCII 127 I'd agree, but it's ASCII 35, which it shares with #. The # isn't referred to by some as a Pound for nothing. :) UKP is Shift-3 on a UK keyboard. (I know what you mean really, there isn't an ASCII code for UKP as it only defines up to 127. I'm just being a belligerent old sod. It was more an observation after being caught out than anything. :) ) Edited 2021-03-28 04:00 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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