Search found 43 matches

by FrancoisLanciault
Sat Nov 17, 2018 5:56 pm
Forum: Hardware
Topic: SGC successor brainstorming
Replies: 25
Views: 631

Re: SGC successor brainstorming

Sorry if my opinions kind of diverge from many QL users... We are talking Super Gold Card replacement. Now at the time, the goal of the SGC was to add more speed and memory to the QL. It was not design to be able to play bareQL games, Although miracle system did their best so that old games would ru...
by FrancoisLanciault
Wed Oct 31, 2018 1:28 am
Forum: Software & Programming
Topic: ED Floppy Discs
Replies: 5
Views: 428

Re: ED Floppy Discs

janbredenbeek wrote:It's QL5B and the sector size is 2048 bytes, so for direct access you should open 'flpx_*D4e'.

Jan.


I confirm. Freshly formatted ED disk. Sector read with "flp2_*D4e"

Francois
by FrancoisLanciault
Tue Oct 30, 2018 4:35 pm
Forum: Software & Programming
Topic: ED Floppy Discs
Replies: 5
Views: 428

Re: ED Floppy Discs

I have a ED drive with some floppy. I can check tonight. However, I will need to search online as I don't remember how to do direct sector access on the ED floppy. So if someone knows the correct sequence of command/utility to use let me know. François I'm looking through some old C68 code of mine, ...
by FrancoisLanciault
Fri Oct 26, 2018 11:04 pm
Forum: Software & Programming
Topic: Microdrive code dependence on CPU speed
Replies: 7
Views: 411

Re: Microdrive code dependence on CPU speed

If I remember well, SMSQ/E does not support microdrive.

As for GC and SGC with Minerva and QDOS, maybe the (S)GC copy the ROM in RAM and proceed with some code patching at startup ?

François
by FrancoisLanciault
Thu Jun 07, 2018 10:57 pm
Forum: The Off-Topic Section
Topic: Need electronic expert advice for a project
Replies: 13
Views: 844

Re: Need electronic expert advice for a project

This makes more sense now on the switch side of things. The switch enable will trigger that lower of the 3 comparator's (there are 4 in the 339 package), and that in turn will switch Q6 on, allowing the SW pin to rise towards +12V, it would normally be dragged to 0.6V by the bias resistor to -12V a...
by FrancoisLanciault
Thu Jun 07, 2018 6:20 pm
Forum: The Off-Topic Section
Topic: Need electronic expert advice for a project
Replies: 13
Views: 844

Re: Need electronic expert advice for a project

Thank you 1024MAK and Pr0f, your answers are definitely and better justified than anything I heard so far! The only remaining mystery is the fact that the switch circuit make sense only if the SW pin has a positive supply even though I have measured a negative voltage. Here is some description of th...
by FrancoisLanciault
Wed Jun 06, 2018 6:06 pm
Forum: The Off-Topic Section
Topic: Need electronic expert advice for a project
Replies: 13
Views: 844

Re: Need electronic expert advice for a project

One quick question - as this could be a showstopper for your project... What monitor or TV do you intend to use? Light pen will only work correctly with a CRT based TV or Monitor, as the LCD doesn't have a 'light spot'. Well, not only it needs a CRT monitor, but it needs the specific high resolutio...
by FrancoisLanciault
Tue Jun 05, 2018 5:53 pm
Forum: The Off-Topic Section
Topic: Need electronic expert advice for a project
Replies: 13
Views: 844

Need electronic expert advice for a project

Hi, I want to recreate the electronic inside a sophisticated light pen for a vintage computer. Nothing related to the QL hence the "Off-Topic" section. I have the original blue print of the electrical schematic. However, there are two or three things that can be interpreted one way or the ...
by FrancoisLanciault
Mon Apr 16, 2018 4:39 pm
Forum: Hardware
Topic: Problem at boot time
Replies: 12
Views: 903

Re: Problem at boot time

What happens when you swap the QLs between the two sets of expansions? Does the problem stay with the respective Gold Cards, or does it stay with the respective QLs? It would be difficult for me to test this because the SCG was modified to work with a backplane (I don't remember what modification I...
by FrancoisLanciault
Mon Apr 16, 2018 4:35 pm
Forum: Hardware
Topic: Problem at boot time
Replies: 12
Views: 903

Re: Problem at boot time

For me this looks like a bad contact somewhere (memory ?). I had a similar problem, it went away when I moved the SGC DRAM chips a little inside their sockets. Hi, Thank you all for your answers. Based on your experiences, I carefully removed all RAM chips from the SuperGoldCard, I inspected them a...

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