Search found 468 matches

by Pr0f
Tue Feb 25, 2020 11:36 am
Forum: The Welcome Area
Topic: Hello From Frankfurt
Replies: 9
Views: 182

Re: Hello From Frankfurt

Quite slim at about 2 cm thick :-) And the best of the 'dead flesh' keyboards from Sir Clive. It even got a reasonable review from Dave on the EEVblog - that's a challenge in itself.
by Pr0f
Mon Feb 24, 2020 3:31 pm
Forum: The Welcome Area
Topic: Hello From Frankfurt
Replies: 9
Views: 182

Re: Hello From Frankfurt

Welcome to the forum!

Love the Z88 - one of Sir Clive's better ideas :-)
by Pr0f
Mon Feb 24, 2020 1:28 pm
Forum: QL Emulation
Topic: How do you make a QL emulator?
Replies: 58
Views: 2004

Re: How do you make a QL emulator?

complers tend to build code to run on a paritcular platform, so the idea that you can compile some source language into an executable that will run anywhere will only ever work if their is some sort of 'hosted platform' or virtual machine that can run anywhere and it is for this that you are compili...
by Pr0f
Fri Feb 21, 2020 12:44 pm
Forum: Hardware
Topic: RGB to VGA
Replies: 18
Views: 609

Re: RGB to VGA

That standard VESA frequnecy does seem to be acceptable to most of the HDMI monitors / my telly that I've tested with. I was also looking at 1024 x 576 at 50Hz as a possible, but there are black bands at the top and bottom as 576 > 512
by Pr0f
Fri Feb 21, 2020 10:25 am
Forum: Hardware
Topic: RGB to VGA
Replies: 18
Views: 609

Re: RGB to VGA

Marcel - with your doubling and tripling, what do the pixels / text look like on the monitor?

Are you using a 65 MHz 'dot' clock for the 1024x768 resolution?
by Pr0f
Fri Feb 21, 2020 7:55 am
Forum: Hardware
Topic: RGB to VGA
Replies: 18
Views: 609

Re: RGB to VGA

QL Video is a bit off because the timings are non standard (the display area is a little larger than it should be for broadcast standards, and the front / back porch are shorter - I believe the Sync pulses are ok for standard PAL / NTSC timings - but the problem this gives is that on a standard TV, ...
by Pr0f
Fri Feb 21, 2020 7:39 am
Forum: QL Emulation
Topic: How do you make a QL emulator?
Replies: 58
Views: 2004

Re: How do you make a QL emulator?

But the mobile phone companies love it - they even have Java VM's in the silicon to process the code 'natively'.

I own a couple of TINI boards from Dallas Semiconductors - these use Java so I had to try and learn the language to use them. Inheritance - like inheritance - like inheritace... ;)
by Pr0f
Wed Feb 19, 2020 5:47 pm
Forum: Hardware
Topic: PCI Express video
Replies: 15
Views: 648

Re: PCI Express video

I suspect the logic payload I am thinking about may even fit into a MACH4256, with a readily available chip to provide digital to hdmi conversion. Just that the MACH4256 costs more than twice the LFE5U-12F, plus the extra costs/space for the external HDMI chip and the external CPU. I'm not saying a...
by Pr0f
Wed Feb 19, 2020 1:56 pm
Forum: Hardware
Topic: PCI Express video
Replies: 15
Views: 648

Re: PCI Express video

Since every modern FPGA suitable for HDMI has enough space to include a CPU, my question is: Would you still want the CPU outside the graphics chip, and why? How about a reply on this? I thought I had covered this with the explanation that what was being considered was a circuit / module that could...
by Pr0f
Wed Feb 19, 2020 11:48 am
Forum: Hardware
Topic: PCI Express video
Replies: 15
Views: 648

Re: PCI Express video

I have been thinking about this for some time too, and trying to figure out a way of getting QL video out of an HDMI socket. There are several hurdles and problems, but some thoughts below: 1) QL screen memory use is a little strange in the layout - so that tends to rule out all but a large CPLD or...