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by belg4rion67
Wed Sep 26, 2018 8:28 am
Forum: Hardware
Topic: VGA BOX
Replies: 4
Views: 438

Re: VGA BOX

yes is true! see this picture: http://www.fruitcake.plus.com/Sinclair/Spectrum128/SCARTCable/Spectrum128SCARTCableQL.htm
QLCableCircuit.gif
QLCableCircuit.gif (5.25 KiB) Viewed 310 times
by belg4rion67
Tue Sep 25, 2018 7:34 pm
Forum: Hardware
Topic: VGA BOX
Replies: 4
Views: 438

Re: VGA BOX

It’s possible because the video signals from that ULA are direct and not protected to rgb socket! If you have some experience with soldering you can attach some zener diodes to protect output pins.
by belg4rion67
Sun Sep 23, 2018 7:08 pm
Forum: Hardware
Topic: QL wont work
Replies: 15
Views: 666

Re: QL wont work

D26 is the diode that bring negative rail to -12 volt regulator ic so is it possible that you have checked the ac voltage that feed power supply; try check the c40 condensator if it has 0 and -12 volt, but in effect that voltage is needed only for rs232 ports so is not the main problem ....
by belg4rion67
Sat Sep 22, 2018 2:16 pm
Forum: Hardware
Topic: QL wont work
Replies: 15
Views: 666

Re: QL wont work

Hi, on the voltage regulator you must have 9-10 volt on right pin that is the output voltage of transformer and 5 volt on left pin to drive all chips on motherboard, also you can check pin 14 of video driver chip ( the one below modulator) where you must have 12 volt.
by belg4rion67
Sat Aug 25, 2018 11:54 pm
Forum: Hardware
Topic: PSU - Alternative
Replies: 1
Views: 195

Re: PSU - Alternative

Hi, any psu that can supply 9 volt dc with at least 1.5 ampere and 15 volt ac with at least 500 mAmpere.
by belg4rion67
Sat Aug 11, 2018 12:39 pm
Forum: Hardware
Topic: Connecting a mouse to the QL
Replies: 8
Views: 665

Re: Connecting a mouse to the QL

Hi, if you search into forum you will find a topic about an interface to connect a ps2 mouse and also in Dilwyn web site you will find a lot of infos about your request.
by belg4rion67
Sun May 27, 2018 8:22 pm
Forum: Hardware
Topic: Miracle Hard Drive problem (Hard Disk Replace)
Replies: 43
Views: 5117

Re: Miracle Hard Drive problem (Hard Disk Replace)

Hi all, unfortunately all my tricks to recover the old hd is going bad; I've also replaced the rom with the last version and nothing happens so I suppose that all hd's are fault. In effect we are speaking about some pieces of hardware of about 30 years old!! I'm very sorry but I think that we need t...
by belg4rion67
Sun May 27, 2018 8:14 pm
Forum: Hardware
Topic: Dead QL
Replies: 10
Views: 845

Re: Dead QL

Right. It also seems to be a fundamental law of something that a chip you have a replacement for is never going to die again ;) Given the high number of Italians here, this seems appropriate: Heeeey, that's a nice 8301 you got there. Would be a shame if something, you know, happened to it... But lo...
by belg4rion67
Mon Mar 19, 2018 5:05 pm
Forum: Hardware
Topic: Microdrive boards
Replies: 26
Views: 2510

Re: Microdrive boards

And, ignoring the metal contactor plate, that style of switch has become something of an industry standard over the last 35 years or so. I bought a whole pile of them with straight contact springs to work as limit switches on my home CNC machine. OT: have you made the CNC by yourself? I've seen a l...
by belg4rion67
Fri Mar 16, 2018 11:06 am
Forum: Hardware
Topic: Microdrive boards
Replies: 26
Views: 2510

Re: Microdrive boards

Hi Dave, I'm interested for 2 units to update :D
Paolo

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