Re: I wonder what these are for?
Posted: Thu Feb 13, 2014 8:50 am
Oh no! It's a QL and all the keys have melted into a smooth mess of plasticDave wrote:Hmmm. What's this?
That's cruelty to QLs!
That's cruelty to QLs!
The Sinclair QL Forum
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I wonder what these are for?
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That's cruelty to QLs!
Re: I wonder what these are for?
Posted: Thu Feb 13, 2014 8:54 am
I tend to smoke (shame on me 
), so everything that vaguely looks like this looks like a lighter to me. Dave, what are you going to burn besides EPROMS?
Tobias
), so everything that vaguely looks like this looks like a lighter to me. Dave, what are you going to burn besides EPROMS?Tobias
Re: I wonder what these mods are for?
Posted: Fri Feb 21, 2014 11:55 am
Check change to subject
Re: I wonder what these mods are for?
Posted: Fri Feb 21, 2014 12:50 pm
Sinclair keeping traditional hand solderers in work...Mr_Navigator wrote:Check change to subject
Mark
Re: I wonder what these are for?
Posted: Fri Feb 21, 2014 2:32 pm
On US QLs, the interrupt runs at 50 Hz in monitor mode, and 59.94 Hz in TV mode, because their NTSC frame rate was 29.97 Hz interlaced, or 59.94 Hz. Their TV was also limited to 525 lines of which only 483 were displayable, so the JSU ROM had changes in font drawing and default channel positioning. It is something like the QL equivalent of reading a large print book.
Timing related functions behave differently in TV vs. monitor mode.
Timing related functions behave differently in TV vs. monitor mode.
Re: I wonder what these are for?
Posted: Fri Feb 21, 2014 4:02 pm
Is there a schematic for this mod?Dave wrote:On US QLs, the interrupt runs at 50 Hz in monitor mode, and 59.94 Hz in TV mode, because their NTSC frame rate was 29.97 Hz interlaced, or 59.94 Hz. Their TV was also limited to 525 lines of which only 483 were displayable, so the JSU ROM had changes in font drawing and default channel positioning. It is something like the QL equivalent of reading a large print book.
Timing related functions behave differently in TV vs. monitor mode.
Re: I wonder what these are for?
Posted: Fri Feb 21, 2014 4:30 pm
No, but I can do one. 
Update to follow.
Update to follow.Re: I wonder what these are for?
Posted: Fri Feb 21, 2014 4:39 pm
The Cs across the RAM chips and CPU as well as the diodes on the 8301 are standard modifications to Samsung QLs, my German one has the same.
The piggy-pack board with the 74HCTsomething and the four blobs that I can't identify seems to be a special mod for US models. That's not in my Samsung QL.
Tobias
The piggy-pack board with the 74HCTsomething and the four blobs that I can't identify seems to be a special mod for US models. That's not in my Samsung QL.
Tobias
Re: I wonder what these are for?
Posted: Fri Feb 21, 2014 10:23 pm
The diodes across 8301 are protection diodes for RGB outputs to prevent spikes created by hot-plugging or unplugging the monitor cable from damaging them. The blobs are silicon glue to hold the board in placetofro wrote:The Cs across the RAM chips and CPU as well as the diodes on the 8301 are standard modifications to Samsung QLs, my German one has the same.
The piggy-pack board with the 74HCTsomething and the four blobs that I can't identify seems to be a special mod for US models. That's not in my Samsung QL.
Tobias
Re: I wonder what these are for?
Posted: Fri Feb 21, 2014 10:34 pm
Thanks Nasta.
Was really unsure what this blobs might be - In the picture it looks like they had wires towards components on the board
Was really unsure what this blobs might be - In the picture it looks like they had wires towards components on the board