The Sinclair QL Forum

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...

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.

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

Fantastic! Except the color

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 ...

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

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...

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...

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.

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...

This was written for the 6850 UART. Still the best I have found as an SMSQ/E-independent example, and by the way many thanks for publishing it! :) It should not be too hard to adapt the low level portions to the Q68. Of course, a direct Q68 SER integration into Minerva would be even better, but tha...