A brief note about the TTL to RS232 adaptor I have used to connect the MECB 6850 to my Wyse terminal. The adaptor needs a 5v DC supply, this has been obtained by feeding 5v to the otherwise unused pin 3 of the board connector J3. On my board I feed it through a small 22 ohm resistor soldered on the...

I'm guessing you're referring to MPLAB X IDE? I'm currently using v6.20 under Windows 10. All problem free. Just thought I'd mention that I just did a clean install (new directories) of the updated MPLAB X IDE v6.25 and XC8 v3.00 on my Windows 10 system, and all installed and operates without probl...

That's good to know Greg, I need to find a programmer for the AVR32EA28 not sure if I have anything suitable. would usb-asp or J-Link work I wonder? All I can advise is that I've been through a few progammers, and in the end I got an official Mcrochip PICkit5, which I now highly recommend! If I'd j...

Further to my post above… :thinking: Note, that I said I was going to “sleep on” my v2.0 PCB changes, before ordering! Well, this is because, without a doubt, I always wake up the next morning with some changes I want to make. I've learnt that you can pass something over to your subconcious to work ...

Well, I think I'm pretty much all done with CreatiVision Keyboard v2.0 :D After digging out an old 386 PC with a PS/2 keyboard port, a lot of analysis, testing, and code optimisation, I’m now finally happy with my full-blown bi-directional PS/2 keyboard. It’s been a fun project, and a great PS/2 pro...

Thanks for posting the video. That display looks really nice in operation. Definitely an improvement over the 6 digit 7-segment displays we had on our early evaluation boards. And, of course, the keyboard is a major improvement on the hex keypads of old! 😎 But, seriously, it was nice to see the keyb...

Update, the signal lines look ok with pull down to zero whether the 10k pull-up is in circuit or not. master board also has 10k pull-up fitted. Yes, my research so far seems to suggest 10K is indeed the suitable pull-up value (as I'd originaly ascertained), and this is common to both controller and...

Hi David. I might ask for some help here. :geek: I’m pretty much happy with my bidirectional PS/2 software implementation, so far, and the scope measured operation. I now get pretty much identical commands and response handshake, when comparing my CreatiVision keyboard to my generic PS/2 keyboard, w...

Well, I managed to spend some time yesterday on advancing the PS/2 interface completeness for the CreatiVision Keyboard. :geek: I’m now at the point where I have evolved my original PS/2 transmission only code, to an early-alpha version of PS/2 bidirectional interface code, where I simultaneously su...

David, you’ve got me interested in the PS/2 challenge! So, investigating this challenge seems to have jumped to the top of my list. :nerd: So far, I’ve wired up a PS/2 plug cable for the Keyboard, and connected it to the PS/2 keyboard input on my F256K2 retro computer. This enabled me to initially s...