Search found 521 matches

by 1024MAK
Wed Mar 27, 2019 12:26 am
Forum: General QL Chat
Topic: Why the QL ?
Replies: 42
Views: 1682

Re: Why the QL ?

Why, because I’m nuts...! Timeline... 1982-1983 watched various TV programmes that featured ‘home computers’. Wanted one :mrgreen: 1983 Christmas - Got a ZX Spectrum 48k :D 1984-1989 ish - upgraded the Spectrum and continued to use it. Was interested in the QL, but the magazine reviews were not good...
by 1024MAK
Fri Mar 01, 2019 11:02 pm
Forum: Hardware
Topic: QL test points...
Replies: 19
Views: 972

Re: QL test points...

A secondary diagnostic microcontroller.
by 1024MAK
Sat Jan 12, 2019 1:50 pm
Forum: Hardware
Topic: LM7805 3A
Replies: 7
Views: 855

Re: LM7805 3A

2) Replace the regulator with a switching buck regulator. This type of a regulator acts similarly to what would be a DC transformer (for reference, a real transformer can only operate on AC). The efficiency is very high so very little excess heat is generated, to the point where a heatsink is not n...
by 1024MAK
Sun Jul 29, 2018 4:17 pm
Forum: Hardware
Topic: Video issue over rf. Changes with reset
Replies: 7
Views: 908

Re: Video issue over rf. Changes with reset

The RF output comes from the modulator. All the modulator does is to put the composite video signal onto a high frequency carrier. The main problem with the modulators and hence the RF output, is that these are analogue devices which use a capacitor-inductor to form the high frequency oscillator, so...
by 1024MAK
Sun Jul 01, 2018 10:54 am
Forum: Software & Programming
Topic: Unique original firmware from the Sinclair Archives
Replies: 10
Views: 1364

Re: Unique original firmware from the Sinclair Archives

While on the subject of the early QL machines that were supplied with a dongle, does anyone have any good quality photos of the the populated board that they used? Or know of web site(s) that have such photos?

Mark
by 1024MAK
Sat Jun 30, 2018 10:29 pm
Forum: Software & Programming
Topic: Unique original firmware from the Sinclair Archives
Replies: 10
Views: 1364

Re: Unique original firmware from the Sinclair Archives

Where is that clapping emoji :?:

Well done Urs 8-) :D

Mark
by 1024MAK
Wed Jun 13, 2018 3:04 pm
Forum: The Off-Topic Section
Topic: Today I Received...
Replies: 41
Views: 3635

Re: Today I Received...

Have you tried it out yet? :) No :( Got to get a grip on the garden and other outdoor jobs while the weather is good... Got the solar system on the shed partly functional, and the 12V lights in the shed and the 'sun house' next to the shed installed, connected up and working. Tested them last night...
by 1024MAK
Tue Jun 12, 2018 7:49 pm
Forum: Hardware
Topic: Q68 Order Process
Replies: 118
Views: 16182

Re: Q68 Order Process

My Q68 arrived today :D https://qlforum.co.uk/download/file.php?id=1867 Q68 case front https://qlforum.co.uk/download/file.php?id=1866 Q68 case rear Thanks Derek https://stardot.org.uk/forums/images/smilies/eusa_clap.gif https://stardot.org.uk/forums/images/smilies/eusa_clap.gif https://stardot.org....
by 1024MAK
Tue Jun 12, 2018 7:44 pm
Forum: The Off-Topic Section
Topic: Today I Received...
Replies: 41
Views: 3635

Re: Today I Received...

My Q68 arrived today :D IMG_7241.JPG IMG_7240.JPG Thanks Derek https://stardot.org.uk/forums/images/smilies/eusa_clap.gif https://stardot.org.uk/forums/images/smilies/eusa_clap.gif https://stardot.org.uk/forums/images/smilies/eusa_clap.gif Mark
by 1024MAK
Fri Jun 08, 2018 10:46 am
Forum: The Off-Topic Section
Topic: Today I Received...
Replies: 41
Views: 3635

Re: Today I Received...

martyn_hill wrote:Just loving the Gigatron!

I build it last weekend at an Acorn meet up. Pictures of it just after I powered it up are here :D

Mark