Search found 344 matches

by guesser
Mon Jun 08, 2020 10:59 pm
Forum: 8-bit acorn hardware
Topic: 3.5” drive cable
Replies: 4
Views: 185

Re: 3.5” drive cable

Blanked pin 3 position keys to a floppy drive, while blanked pin 5 position is for the PC motherboard end.
by guesser
Mon May 18, 2020 11:46 pm
Forum: 8-bit acorn hardware
Topic: Someone's pinched my econet!
Replies: 12
Views: 616

Re: Someone's pinched my econet!

It is normal for them to snap off if you look at them funny though.
by guesser
Mon May 18, 2020 7:41 pm
Forum: programming
Topic: Real resolution of Mode 7
Replies: 14
Views: 606

Re: Real resolution of Mode 7

tricky wrote:
Mon May 18, 2020 7:09 pm
There are other more efficient ways to do underline, like swapping a space for inverse and another for normal using the same timing as above. Strike through could be the same but in the centre of the character.
There's no underline character in the SAA5050 ROM anyway :)
by guesser
Mon May 18, 2020 3:40 pm
Forum: general
Topic: Teletext Hold Mosaics query
Replies: 16
Views: 469

Re: Teletext Hold Mosaics query

The links were generated by the Teletext Page Editor itself! I imported a binary file (960 bytes, with duplicated double-height rows) and then copied-and-pasted the URL from the address bar. Isn't that a valid thing to do? It is! Clearly binary input is just another feature nobody apparently uses o...
by guesser
Mon May 18, 2020 2:48 pm
Forum: general
Topic: Teletext Hold Mosaics query
Replies: 16
Views: 469

Re: Teletext Hold Mosaics query

Row 23 is the second row of a double-height pair (22 and 23) so everything in it should be ignored. I can see why you might want to strip double-height codes from row 23 if it's the first of a pair, but not as the second. It is ignored by the renderer, but it still shouldn't be present in packet 23...
by guesser
Mon May 18, 2020 1:36 pm
Forum: 8-bit acorn hardware
Topic: Monitors compatible for the BBC micro
Replies: 12
Views: 491

Re: Monitors compatible for the BBC micro

1024MAK wrote:
Sun May 17, 2020 6:50 pm
Most users no longer use this, as it is the least best quality output.
That's a very generous way to put it 😂
by guesser
Mon May 18, 2020 1:05 pm
Forum: general
Topic: Teletext Hold Mosaics query
Replies: 16
Views: 469

Re: Teletext Hold Mosaics query

Aha, I see the problem which is specific to these links. It's because those links have double height codes in row 23 which are stripped on import which causes an update of the URL. When you go back to the initial page it happens again, and so on.
by guesser
Mon May 18, 2020 12:42 pm
Forum: general
Topic: Teletext Hold Mosaics query
Replies: 16
Views: 469

Re: Teletext Hold Mosaics query

Can you also explain why I can't "BACK" from that page? It keeps forcing me /forward/ back to the same page! I had to Bookmark->Forums->StarDot->Active threads->this one to get back here. It'll be down to the way the url fragment is used for the teletext data. Not sure why it's messing the start of...
by guesser
Mon May 18, 2020 12:08 am
Forum: general
Topic: Teletext Hold Mosaics query
Replies: 16
Views: 469

Re: Teletext Hold Mosaics query

Thanks for the heads up Richard. I've uploaded new rendering code, so all the size control codes should clear hold mosaic state appropriately at their relevant render level now. :D
by guesser
Sun May 17, 2020 11:44 pm
Forum: general
Topic: Teletext Hold Mosaics query
Replies: 16
Views: 469

Re: Teletext Hold Mosaics query

Oh dear, three decoders have been tested and all three have a different hold mosaics bug :lol:

2/3 agree is that it clears it set-at, the other gets it entirely wrong and doesn't clear the mosaic at all!
by guesser
Sun May 17, 2020 11:36 pm
Forum: general
Topic: Teletext Hold Mosaics query
Replies: 16
Views: 469

Re: Teletext Hold Mosaics query

Richard Russell wrote:
Sun May 17, 2020 11:29 pm
Can you explain this one: with a slightly changed test page the magenta block itself is now double height. It's almost as if the Teletext Editor sometimes treats the Normal Size code as Set At and sometimes as Set After!
No I can't! :shock:
by guesser
Sun May 17, 2020 11:32 pm
Forum: general
Topic: Teletext Hold Mosaics query
Replies: 16
Views: 469

Re: Teletext Hold Mosaics query

TVs are being probed now :)

I'm certain I have bugs in this anyway because now that I've looked the double size/width at level 2.5 interacts with hold in nonsensical ways too. #-o
by guesser
Sun May 17, 2020 11:15 pm
Forum: general
Topic: Teletext Hold Mosaics query
Replies: 16
Views: 469

Re: Teletext Hold Mosaics query

It is entirely possible that this case has been overlooked and implemented incorrectly. I fixed some other hold mosaic bugs in edit.tf for Simon so it may not be two independent implementations of the same bug/feature either! I wish the specifications were more explicit on how various cases should b...
by guesser
Mon May 11, 2020 9:04 pm
Forum: 8-bit acorn hardware
Topic: Pi1MHz future supported devices
Replies: 15
Views: 627

Re: Pi1MHz future supported devices

I hadn't really thought...but yes, if there's a store of Teletext pages on the SD card and the Teletext Adapter can fetch them like it's downloading them from the airwaves that would be good. Maybe it will also be possible to support Telesoftware. You'd have to implement an entire teletext inserter...
by guesser
Mon May 11, 2020 8:58 pm
Forum: 8-bit acorn hardware
Topic: Pi1MHz future supported devices
Replies: 15
Views: 627

Re: Pi1MHz future supported devices

Teletext how do people imagine this working ? A preset number of pages on the SDcard ( e.g. 1000 pages is only 1Mbyte SDCARDs are big !) Ideally a way to stuff packets into it from the outside world, either a serial link or network connection (though I assume the latter is very tricky on the bare m...
by guesser
Sun May 10, 2020 12:01 pm
Forum: 8-bit acorn hardware
Topic: Pi1MHz future supported devices
Replies: 15
Views: 627

Re: Pi1MHz future supported devices

BeebMaster wrote:
Sun May 10, 2020 11:48 am
Teletext Adapter?????
I was thinking that... but it looked like pretty much all the IO was used up by the 1MHz bus
by guesser
Sun Apr 26, 2020 9:58 am
Forum: off-topic
Topic: Acorn Art Thread
Replies: 1286
Views: 97101

Re: Acorn Art Thread

daveejhitchins wrote:
Sun Apr 26, 2020 8:17 am
Not sure I'd recognise you in the supermarket, though :lol:
What if you step back from your computer and view the artwork from 2+ metres away? :D
by guesser
Thu Apr 23, 2020 4:03 pm
Forum: off-topic
Topic: Acorn Art Thread
Replies: 1286
Views: 97101

Re: Acorn Art Thread

Doh, I forgot to spam inform you all about this year's Teletext Block Party this weekend! For obvious reasons we're unable to hold the intended physical meet, so we're moving the festivities online. Livestreams etc are loosely planned for Saturday, and the block party teletext editing server has bee...
by guesser
Mon Apr 13, 2020 10:27 pm
Forum: software & utilities for the pc, mac or unix
Topic: Teletext to Viewdata server
Replies: 75
Views: 4055

Re: Teletext to Viewdata server

Soruk wrote:
Sun Apr 12, 2020 5:42 pm
You are absolutely right. And yes, it's the coloured labels feature that is now supported. So, finally, Bamboozle is now playable!
Navigation via Full Level One Facilities :D
by guesser
Wed Mar 18, 2020 6:29 pm
Forum: 8-bit acorn hardware
Topic: BBC Master Composite colour fix - stuck
Replies: 33
Views: 1191

Re: BBC Master Composite colour fix - stuck

The problem is always the fast blanking which was there from the start as far as I'm aware. The RGB lines are there to display genlocked overlays and subtitles and such by driving the screen directly while the decoded RGB signals from the composite input are blanked for overlays, captions, and so fo...
by guesser
Wed Mar 18, 2020 2:37 pm
Forum: 8-bit acorn hardware
Topic: BBC Master Composite colour fix - stuck
Replies: 33
Views: 1191

Re: BBC Master Composite colour fix - stuck

I thought SCART was developed in the 70s, we didn't see it over here until later.
by guesser
Sun Mar 15, 2020 10:56 pm
Forum: software & utilities for the pc, mac or unix
Topic: Teletext to Viewdata server
Replies: 75
Views: 4055

Re: Teletext to Viewdata server

A lot of the characters on that test page come from the odd numbered clock cracker lines which have 38 control codes. That becomes 76 characters in viewdata. Then the hold mosaics stuff on either side of the engineering and test page labels is similarly solid with control codes.
by guesser
Mon Mar 09, 2020 2:48 pm
Forum: 8-bit acorn hardware
Topic: What ports are you using (and how)?
Replies: 18
Views: 806

Re: What ports are you using (and how)?

At the moment nothing because the Beeb is currently packed away, but answered 1MHz bus and disc drive as that's what gets used when it is out. (For Acorn teletext adapter and twin floppy unit)
by guesser
Sat Mar 07, 2020 11:32 pm
Forum: 8-bit acorn emulators
Topic: Beebem State Files
Replies: 6
Views: 529

Re: Beebem State Files

UEF is a chunked data format so you can't rely on reading data from fixed offsets as files could contain any combination of chunks of variable length in any order. Even if you know you're only reading state files from BeebEm what it generates could be different between versions. Of course this doesn...
by guesser
Wed Feb 19, 2020 6:12 pm
Forum: 8-bit acorn hardware
Topic: Ceefax / Teefax on beeb
Replies: 7
Views: 466

Re: Ceefax / Teefax on beeb

Which ROM gives a data error? It's quite possible that it's working as intended, because vbit2 doesn't generate a valid page checksum yet. It's not been a high priority because I've not yet found anything that actually uses it.
by guesser
Tue Feb 18, 2020 8:22 pm
Forum: software & utilities for the pc, mac or unix
Topic: Teletext to Viewdata server
Replies: 75
Views: 4055

Re: Teletext to Viewdata server

Alternative national option characters can be selected using three of the control bits in a teletext page header. These bits were unallocated in the 1976 broadcast teletext specification but were introduced before the "levels" were formalised and so are part of what was retrospectively defined as le...
by guesser
Tue Feb 18, 2020 5:26 pm
Forum: software & utilities for the pc, mac or unix
Topic: Teletext to Viewdata server
Replies: 75
Views: 4055

Re: Teletext to Viewdata server

Just a different character ROM. I bet if you open it it contains an SAA5053 :)

Find the engineering test page, all the fractions etc will be replaced with Italian national characters
by guesser
Tue Feb 18, 2020 1:50 pm
Forum: 8-bit acorn hardware
Topic: Ceefax / Teefax on beeb
Replies: 7
Views: 466

Re: Ceefax / Teefax on beeb

It's as simple as installing vbit2 on a pi , connecting the composite output to a UHF modulator, then feeding that into the teletext wedge and tuning it in per the manual. If you have an old VCR you can likely use this as a modulator by selecting the AV input and connecting the wedge to the RF outpu...
by guesser
Tue Feb 18, 2020 11:17 am
Forum: 8-bit acorn hardware
Topic: Ceefax / Teefax on beeb
Replies: 7
Views: 466

Re: Ceefax / Teefax on beeb

Depends whether you just want to read the pages (using the viewdata gateway someone runs), or receive teletext.

For the latter you'd need to get hold of one of the a teletext adapters :)

https://pbs.twimg.com/media/DqxPMKuXcAAeOPy?format=jpg

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