Search found 128 matches

by janbredenbeek
Thu Jun 15, 2017 8:36 am
Forum: Hardware
Topic: QL Eprom Programmer
Replies: 4
Views: 246

Re: QL Eprom Programmer

Hi Paul, Hello Jan, thank you for posting the Schematic of your 1988 Eprom programmer here . Of course a PCB can be designed and made. If you like me to do so I will start this. On the other hand you made the proposal to use an FPGA instead of all this chips like LSxxx and 8255. If we go a redesign ...
by janbredenbeek
Wed Jun 14, 2017 3:46 pm
Forum: Software & Programming
Topic: Status of QMON
Replies: 26
Views: 1466

Re: Status of QMON

Hi Jan, I have a copy of your schematic, which you sent to me in the 1990s. :P I am sorry that I did not get around to making the Eprommer. Maybe this is something that could be done, with a professionally made PCB. I wonder if the 8255 and handful of 74LS chips could be replaced by a single FPGA -...
by janbredenbeek
Wed Jun 14, 2017 12:30 pm
Forum: Software & Programming
Topic: Status of QMON
Replies: 26
Views: 1466

Re: Status of QMON

Can it program 2732 as well? It was designed for 2764-27512 but if the 2732 is electrically compatible with 2764 it can probably program them. IIRC the smaller eprom types need 21V programming voltage and this is achieved with a step-up inverter using a TL497 circuit (see attached diagram). As it w...
by janbredenbeek
Wed Jun 14, 2017 10:26 am
Forum: Software & Programming
Topic: Status of QMON
Replies: 26
Views: 1466

Re: Status of QMON

I used to have a copy of QMON but lost it somewhere in the past 30 years... I still have the source of MultiMon which is on GitHub now and it's also on my list of old projects to be re-activated. If you have any wishes you can post them here. I have also written software for a home-made Eprom progra...
by janbredenbeek
Sat Jun 03, 2017 11:01 am
Forum: Hardware
Topic: Which video output do you use? Why?
Replies: 11
Views: 710

Re: Which video output do you use? Why?

I have a TV/ monitor with poor connectivity. It supports just composite (separate red, white, and yellow leads) and DVI. I infer from your post that the QL RGB socket actually includes a composite signal. Does anyone know if there is a QL RGB to composite cable? Converting RGB to composite is not s...
by janbredenbeek
Sat Jun 03, 2017 10:42 am
Forum: Hardware
Topic: What video display do you use?
Replies: 26
Views: 1344

Re: What video display do you use?

Does the card in your PC have a S-video or RGB input? S-Video (which I know consists of separate chroma and luma signals). I still have to figure out how to generate these two from the QL output, which only has pins for luma (which works fine in monochrome) and composite (which gives a lot of noise...
by janbredenbeek
Fri Jun 02, 2017 11:56 pm
Forum: Hardware
Topic: What video display do you use?
Replies: 26
Views: 1344

Re: What video display do you use?

I'm using a rather unusual setup: a PC with TV card as video input and VLC player to display the QL's screen on the PC. This has advantages (using one monitor for both PC and QL without having to switch), but also disadvantages (low quality picture since I have to use the composite video). Since I u...
by janbredenbeek
Sat May 20, 2017 12:47 am
Forum: Software & Programming
Topic: Identifying floppy disk images
Replies: 4
Views: 420

Re: Identifying floppy disk images

I would be very interested in a virtual FLP-driver that can handle ED diskette images. I have about a dozen of them and since they are some 25 years old now (including the hardware needed to read them) preservation of the contents becomes urgent. I've managed to copy an image of one diskette onto se...
by janbredenbeek
Fri May 19, 2017 4:26 pm
Forum: Hardware
Topic: QL Hard Disk 40MB from Miracle Systems
Replies: 20
Views: 1388

Re: QL Hard Disk 40MB from Miracle Systems

Yesterday I test it and works perfectly, wow!!! The 2 "FANS" are a little "HARD" to hear but I love it as it was made originally ;) Just one thing: I see that I can't delete the LEVEL 2 subdirs here as I do on the recent QUBIDE/TRUMP CARD clone (with WDEL_dumps where dumps is a ...
by janbredenbeek
Fri May 12, 2017 9:40 am
Forum: Hardware
Topic: QL Hard Disk 40MB from Miracle Systems
Replies: 20
Views: 1388

Re: QL Hard Disk 40MB from Miracle Systems

I ran a BBS on a Miracle Hard Drive on a Gold Card QL with Hermes. Big enough for most software I had at the time. Never managed to get a 'drive full' error :D The only problem I had, was that it very noisey due to the two fans cooling a large linear power supply, with toroidal transformer. Maybe c...

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