Search found 157 matches

by Nasta
Wed Jun 28, 2017 5:01 pm
Forum: Hardware
Topic: What features matter to you?
Replies: 8
Views: 273

Re: What features matter to you?

I'm not really certain what the complaint is about, does the question not say 'WHAT ARE YOU WILLING TO LOSE'?
I suspect, from the original QL setup as it was in 1983...
by Nasta
Wed Jun 28, 2017 3:02 pm
Forum: Hardware
Topic: 8302 pinout help request...
Replies: 2
Views: 89

Re: 8302 pinout help request...

From the Aurora board: 1 ERASE out 2 EXTINTL in 3 MDR/WL out 4 NETO out 5 BAUDX4 in? 6 CTS1 in 7 CTS2 in 8 DSL in 9 RDWL in 10 PCENL in (= chip select) 11 VCC (+5V) 12 D2 io 13 TXD1 out 14 TXD2 out 15 A5 in 16 NETI in 17 A1 in 18 A0 in 19 RAW2 io 20 GND 21 RAW1 io 22 D7 io 23 D6 io 24 D4 io 25 CLKIN...
by Nasta
Thu Jun 15, 2017 10:26 am
Forum: Hardware
Topic: What video display do you use?
Replies: 26
Views: 1517

Re: What video display do you use?

Well, you have to sort-of be a lawyer. HDMI.org is being tricky because the infrastructure is based around the connector. So you can't put one on your product even if you use it for a parallel port :P without paying the license, and in fact you will pay more if it's NOT labeled HDMI as they consider...
by Nasta
Tue Jun 13, 2017 4:06 pm
Forum: Hardware
Topic: What video display do you use?
Replies: 26
Views: 1517

Re: What video display do you use?

The trick is to look for DVI transmitters rather than HDMI, there is still compatibility but the resolutions are 'limited' to 1080P.
Look at the Ti TFP410
by Nasta
Tue Jun 13, 2017 11:29 am
Forum: Hardware
Topic: What video display do you use?
Replies: 26
Views: 1517

Re: What video display do you use?

Even full frame buffering with 50-60Hz conversion has some problems (remember progressive pull-down on DVDs when 24FPS film was converted to 60Hz video?), so it's not a simple proposition whichever way one goes. On the other hand, is there a 50Hz version of 1024x768 VESA? At some point I remember ha...
by Nasta
Mon Jun 12, 2017 9:31 pm
Forum: Hardware
Topic: What video display do you use?
Replies: 26
Views: 1517

Re: What video display do you use?

Yes, easily. Some early examples of the CLA version could not go as far as the latter plastic ones, but all seem to be able to go quite a ways further than 15MHz. One thing I really can't understand is why Sinclair did not run the thing at 16MHz in the first place, At 15MHz, it divides the main crys...
by Nasta
Mon Jun 12, 2017 5:04 pm
Forum: Hardware
Topic: What video display do you use?
Replies: 26
Views: 1517

Re: What video display do you use?

The QL pixel clock is 10MHz in mode 4 (and in mode 8 it will just do double sampling so no big deal), and it can be reconstructed from CPUCLK by multiplying it by 2 and dividing by 1.5 (or in PLL terms, multiply by 1.3333333). There are a couple of cheap chips that can do that and at the same time p...
by Nasta
Mon Jun 12, 2017 4:37 pm
Forum: Hardware
Topic: Discussion about connecting RASPI to QL
Replies: 34
Views: 2299

Re: Discussion about connecting RASPI to QL

Sure, you 'just' write a completely new con/scr device, update wman and ptrgen, so that the QL 'only' handles standard OS calls and communicates them over to the Pi which actually does the work. So that's the theory. I'll let Marcel or someone explain the (im)practicalities of that much work (after ...
by Nasta
Mon Jun 12, 2017 2:32 am
Forum: Hardware
Topic: Discussion about connecting RASPI to QL
Replies: 34
Views: 2299

Re: Discussion about connecting RASPI to QL

Welll.... for what it's worth, buffers should not be enabled towards the QL pins unless QL bus BGL is low (which would be the response of driving BRL low, this is the only pin on the bus you can do this to - of course interrupts etc do not count). Otherwise attempting to write something to the bus w...
by Nasta
Mon May 29, 2017 9:33 pm
Forum: Hardware
Topic: Discussion about connecting RASPI to QL
Replies: 34
Views: 2299

Re: Discussion about connecting RASPI to QL

I am sorry to say there is a lot of wishful thinking going on in this thread. There are two areas of contention: 1: if you want to use something else on the QL bus instead of the fitted CPU, the appropriate protocol for this has to be used, involving BGL and BRL lines. This is only possible on a bar...

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