Search found 265 matches

by Pr0f
Sun Apr 22, 2018 10:56 pm
Forum: General QL Chat
Topic: What does...make QL...the QL?
Replies: 13
Views: 726

Re: What does...make QL...the QL?

Plus points for me:

It was Black
It was a Sinclair
It had well presented manuals
Once TK2 arrived, you could so some wacky stuff over that network!
It came with some half descent packages to work straight away
It was built with expansion in mind
by Pr0f
Fri Apr 20, 2018 12:17 pm
Forum: Hardware
Topic: 68060 based QL system?
Replies: 112
Views: 4780

Re: 68060 based QL system?

The original coprocessor architecture of the 68K was supposed to be extensible, but I only recollect FPU and MMU being made availabe, were there any others?? There were at least the 68440/450 DMA controllers, 68681 DUART, 68901 MPU and 68230 PIT Tobias The last 3 on your list are purely support chi...
by Pr0f
Fri Apr 20, 2018 11:00 am
Forum: Hardware
Topic: 68060 based QL system?
Replies: 112
Views: 4780

Re: 68060 based QL system?

What about potential instruction time improvements that could be had with FPGA design, and in addition to that, the possibility of building in some primatives that could provide functions to accelerate parts of the code that are involved in repetative data movements ? The original coprocessor archit...
by Pr0f
Wed Apr 18, 2018 2:04 pm
Forum: Hardware
Topic: Testing Tetroid backplane and GC
Replies: 47
Views: 2381

Re: Testing Tetroid backplane and GC

... Many thanks Pr0f, very useful to know! Is there example of a boot file available which loads in the standard sort of things that people are interested in these days? TKII, QubATA, etc? I guess this is how SMSQ/E would be fired up too? I can probably find the one I used to use when I get back ho...
by Pr0f
Tue Apr 17, 2018 2:32 pm
Forum: Hardware
Topic: 68060 based QL system?
Replies: 112
Views: 4780

Re: 68060 based QL system?

There is that question - what part of the QL is it that you want to improve or keep going forward? Apple have gone through several processors, and a couple of OS's under the hood in their progression. Is it the QDOS / SMSQ look and feel that's important, or the allegiance to the Motorolla processor ...
by Pr0f
Mon Apr 16, 2018 10:53 pm
Forum: Hardware
Topic: Problem at boot time
Replies: 12
Views: 548

Re: Problem at boot time

warm up issues can also be related to power supply. Capacitors deteriorate over time. If voltages are a little low until the components are warmed up, it may be that the supply is insufficient to guarantee proper operation when cold. Checks with a multimeter can help.
by Pr0f
Mon Apr 16, 2018 12:55 pm
Forum: Hardware
Topic: Testing Tetroid backplane and GC
Replies: 47
Views: 2381

Re: Testing Tetroid backplane and GC

So, the trumpcard rom chip is a 32K device, with approximately one half being the disk driver and other driver support software, and the other half being the toolkit II. I say approximately half, because some of the TK II images are actually larger than 16Kb. From my understanding of the ROM scan lo...
by Pr0f
Fri Apr 13, 2018 12:54 pm
Forum: Hardware
Topic: (S)GC memory
Replies: 2
Views: 166

Re: (S)GC memory

The addressing for the memory comes from the large ingot chip - which is a programmable logic device. The design is quite pin constrained, so upping the memory is not an option I'm afraid.
by Pr0f
Tue Apr 10, 2018 11:27 am
Forum: Hardware
Topic: Testing Tetroid backplane and GC
Replies: 47
Views: 2381

Re: Testing Tetroid backplane and GC

Gold card does work with backplanes, but from my experience it doesn't like long connections, so some backplanes work better than others. Have you tried taking out the 68008 from the QL when you use the Gold card ? I made a flip over backplane for my gold card and ran that on top and upside down of ...
by Pr0f
Tue Apr 03, 2018 10:58 am
Forum: Hardware
Topic: QL Eprom programmer
Replies: 28
Views: 1905

Re: QL Eprom programmer

I have one of these GAL programmer kits from Elektor - It didn't have any intelligence on board if my memory serves me - just TTL registers and serial shifters to setup the various pins and voltages. The programming logic for the GAL chips was documented in the LATTICE data books - and there have be...

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