Search found 1302 matches
- Sat Apr 20, 2024 4:45 pm
- Forum: The Off-Topic Section
- Topic: PSU Primary side issue (non QL)
- Replies: 2
- Views: 23
Re: PSU Primary side issue (non QL)
Looks like the 12V output from the PSU is used to regulate the PSU primary circuit, and the 5V circuit is further regulated by another IC, and also has a crowbar circuit across the input to that IC.
- Sat Apr 20, 2024 4:29 pm
- Forum: The Off-Topic Section
- Topic: PSU Primary side issue (non QL)
- Replies: 2
- Views: 23
Re: PSU Primary side issue (non QL)
Do you have the service manual for it? Those circled numbers probably have expected waveforms or voltages to measure on the primary side, so if they are ok, the issue is likely on the secondary side of it. It's rare but not impossible for rectifiers on the secondary side to fail, which will obviousl...
- Tue Apr 09, 2024 3:45 pm
- Forum: The Off-Topic Section
- Topic: The Victorian Age
- Replies: 5
- Views: 235
Re: The Victorian Age
Back then Video hadn't even been born, so the Radio star was safe
- Sun Apr 07, 2024 5:11 pm
- Forum: The Off-Topic Section
- Topic: Happy Birthday!
- Replies: 437
- Views: 215710
Re: Happy Birthday!
Happy Birthday - enjoy the vino
- Thu Mar 21, 2024 9:04 am
- Forum: The Off-Topic Section
- Topic: Royal Mail Delays
- Replies: 6
- Views: 163
Re: Royal Mail Delays
To be fair to them - I've had something stuck at "langley" and it was down to customs check delays - so although it appeared to indicate RM had my parcel - it had not been officially released to them. I hate the fact that the tracking from either side doesn't tell you what our lovely HMRC ...
Re: RTC Query
esp32_ser.jpgHey Pr0f ; Someone was way ahead of me :D Anyway its great to try to program such nice connection. And one can make your own preferences. I do like the lilygo products though - and there is probably a lot more this could potentially offer - would be interesting to see how well it works...
Re: RTC Query
I wonder if those serial network modems would provide time?
https://www.simulant.uk/shop/retro-vint ... compatible
https://www.simulant.uk/shop/retro-vint ... compatible
Re: RTC Query
The other approach would be to use an RTC chip that actually does have a "seconds counter" and just disable the ZX8302 whenever a read access to those RTC addresses is made - and provide the data from the seconds counter RTC chip instead. No I2C needed - as the code in the QL is already se...
Re: RTC Query
The Minerva MKII has I2C interface and does have an on board I2C RTC and RAM chip.
There is a project ongoing on here to recreate the PCB for that - the code is already in the Minerva ROM
There is a project ongoing on here to recreate the PCB for that - the code is already in the Minerva ROM
- Tue Mar 05, 2024 4:51 pm
- Forum: The Off-Topic Section
- Topic: Today I Received...
- Replies: 642
- Views: 288387
Re: Today I Received...
I rescued a BBC Basic manual from a school I worked out - was for RM machines - but it contains the full list of commands. Also since picked up some books on the Z88 that cover BBC Basic - It's a good version of the language.