Search found 1232 matches

by Peter
Sat Jan 30, 2021 12:07 pm
Forum: Hardware
Topic: QLUB Adapter - Initial Release...
Replies: 108
Views: 6108

Re: QLUB Adapter - Initial Release...

Hi Martyn, I have an almost complete design for a backwards-compatible enhancement to the Sinclair protocol, that would allow for dynamic/negotiated bit-timings and other capabilities between machines that can support them in a way that is invisible/transparent to any legacy machines also listening,...
by Peter
Sat Jan 30, 2021 11:13 am
Forum: Hardware
Topic: QLUB Adapter - Initial Release...
Replies: 108
Views: 6108

Re: QLUB Adapter - Initial Release...

Whilst on this (off-) topic and just as a little teaser - an updated version of the ND-Q68 driver that I am still testing can push over 700 kbps (that's bits per second, not bytes) between a pair of Q68s... :-) That's amazing. Roughly guessing about 60KB/s actual file transfer throughput, that's al...
by Peter
Fri Jan 29, 2021 11:28 pm
Forum: Software & Programming
Topic: New Pointer Environment
Replies: 22
Views: 1459

Re: New Pointer Environment

dilwyn wrote:I guess it's a documented feature (QPTR guide etc), so purely in that respect it should be included. But I do take the point that it's rarely if ever been used.

I use it in my email client, and so does QPOP3.
by Peter
Fri Jan 29, 2021 12:15 pm
Forum: Hardware
Topic: QLUB Adapter - Initial Release...
Replies: 108
Views: 6108

Re: QLUB Adapter - Initial Release...

M68008 wrote:I've moved the circuit from the breadboard to a permanent circuit and box:

Fantastic! :) Except the color :P
by Peter
Fri Jan 29, 2021 12:14 pm
Forum: Hardware
Topic: QLUB Adapter - Initial Release...
Replies: 108
Views: 6108

Re: QLUB Adapter - Initial Release...

There is and I've added a topic on the Off Topic section to explain the differences. It's at https://qlforum.co.uk/viewtopic.php?f=9&t=3643 if anyone is interessted. Thanks Norman! My question even had an almost on-topic backround. I was starting to have a look if Martyn's code could be ported ...
by Peter
Fri Jan 29, 2021 11:57 am
Forum: The Off-Topic Section
Topic: Ino (Arduino) and CPP file differences - For Peter
Replies: 4
Views: 230

Re: Ino (Arduino) and CPP file differences - For Peter

Hi Norm,
many thanks, that's much more of an answer than I expected or deserved as a non-Arduino user who was just nosy. ;)
All the best
Peter
by Peter
Thu Jan 28, 2021 10:47 pm
Forum: Hardware
Topic: QLUB Adapter - Initial Release...
Replies: 108
Views: 6108

Re: QLUB Adapter - Initial Release...

Another issue is the non-streaming nature of the protocol. Every 255-byte block has to be ACKed before the next can be sent, which degrades throughput to 50% or less of what would theoretically be possible. This even hampers performance when using Ethernet connections between emulated systems. When...
by Peter
Sat Jan 23, 2021 8:43 am
Forum: Hardware
Topic: Q40 and Q60 video controller for flatscreen monitors
Replies: 52
Views: 10481

Re: Q40 and Q60 video controller for flatscreen monitors

Could you supply this updated chip to me? It should have arrived by now. You need to replace U23, which is the third PLD from left to right, if the power connector is in front of you. The one above the eight VRAM chips. Your monitor should then recognize a 1024x768 resolution and leave the lower th...
by Peter
Fri Jan 22, 2021 2:43 pm
Forum: Hardware
Topic: Raspberry Pi - New Microcontroller
Replies: 17
Views: 968

Re: Raspberry Pi - New Microcontroller

NormanDunbar wrote:No, while it can be powered from 1.8 to 5V, it's definitely 3.3V on the pins etc. Like the Raspberry Pi is too.

And as far as I saw the microcontroller itself can not be powered by 5V, that is done by an external converter.
by Peter
Fri Jan 22, 2021 1:23 pm
Forum: Hardware
Topic: Raspberry Pi - New Microcontroller
Replies: 17
Views: 968

Re: Raspberry Pi - New Microcontroller

I don't have a link for the purchase of the bare chips - they are only 7mm by 7mm apparently! And 0.4 mm pitch unfortunately. Looks like they want to promote breakout board sales. Another thing that hurts for QL use is lack of 5V tolerance. Many FPGA have clamp diodes that allow to overcome this by...