I wonder what these are for?

dilwyn · Post by **dilwyn** » Thu Feb 13, 2014 8:50 am

Dave wrote:Hmmm. What's this?
QLOAS.jpg

Oh no! It's a QL and all the keys have melted into a smooth mess of plastic

That's cruelty to QLs!

tofro · Post by **tofro** » 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

Mr_Navigator · Post by **Mr_Navigator** » Fri Feb 21, 2014 11:55 am

Check change to subject

1024MAK · Post by **1024MAK** » Fri Feb 21, 2014 12:50 pm

Mr_Navigator wrote:Check change to subject

Sinclair keeping traditional hand solderers in work...

Mark

Dave · Post by **Dave** » 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.

Nasta · Post by **Nasta** » Fri Feb 21, 2014 4:02 pm

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.

Is there a schematic for this mod?

Dave · Post by **Dave** » Fri Feb 21, 2014 4:30 pm

No, but I can do one.

Update to follow.

tofro · Post by **tofro** » 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

Nasta · Post by **Nasta** » Fri Feb 21, 2014 10:23 pm

tofro 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

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 place

tofro · Post by **tofro** » 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

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