Richard Russell wrote:
paulb wrote:Maybe the "on board Teletext display controller" and "second generation Teletext chip technology" can sink in before the chorus of naysaying resumes.
As has been pointed out, simply referring to the 'Morley teletext adapter' doesn't make it clear whether you mean the adapter for the BBC Micro
Hold it right there! Not only did I post advertisements for the Electron
adapter but I originally wrote (with emphasis added because it obviously didn't sink in before)...
Of course, had a market for high-resolution rendering of Teletext pages existed, those add-on makers could have done what Morley did when making their add-on for the Electron. In fact, from memory, the Morley add-on was also pitched at the Beeb and actually offered a higher level of support for the Viewdata standards than the Mullard IC in the Beeb, or this was at least a supposed selling point.
Of course, I was then erroneously contradicted by people who presumably thought I was making up a product out of thin air. (Thanks go to BigEd for finding a review which practically confirms what I wrote to start with.)
Richard Russell wrote:I think it was pretty clear in the context of this thread (which is about the BBC Micro specification, not the Electron) that it was the former that was being referring to.
My statement being in the context of the preceding sentence which was...
The point there was that the CPC displays the Teletext pages without dedicated hardware, and for those who were interested in this (which from the "reviews" doesn't sound as if they expected it to be too many people) maybe the crude low-resolution rendering did the job.
Which was only following on from...
And none of the subsequent competitors, either. One might have expected the C64 to be oblivious to Teletext, being an American machine, but the Amstrad didn't have dedicated Teletext hardware in the base machine. (It did have adapters, though.) Yes, the resulting output isn't very nice, but the adapters could have done what the Morley adapter did on the Electron and couple the capability of obtaining data with the capability of displaying it nicely.
(Now I find myself doing a thread review for everyone else's benefit. And, of course, another mention of the Electron
Morley adapter and a distinction between display
All of which was merely exploring the possibility that Teletext display for the purposes of viewing broadcast text or dial-up services could have been done as an afterthought. No more than that. Not a statement on how wonderful mode 7 was as it was done on the Beeb, that it only used 1K, or whatever. Merely that, just like adding CP/M support through an accessory, people might have just done the same for Teletext. Not because people wanted to have a low-memory screen mode with low-resolution graphics, but because they might have wanted to use the services employing that display technology and would therefore have needed extra hardware anyway. Maybe they would have used the full Mullard chipset, maybe not. I only report that people tried it both ways.
Richard Russell wrote:
As regards "2nd generation teletext", Level 2 Teletext
(which I am assuming is what you mean) did not arrive until 1988. Full-field teletext, as mentioned by Morley in the ad, is simply a higher speed delivery mechanism and doesn't have any implications for the display.
I honestly don't care what Morley claimed. The only purpose those quotes from the advert served was to confirm that the adapter did Teletext display, contrary to what the naysayers were claiming. And thus, it illustrates that such solutions were completely possible and didn't have to compromise on any notion of how nice the display had to be. We didn't even get to consider the underlying motivations for the stipulation or the consequences, which is what seems to have provoked this increasingly narrow diversion, but whatever.
Given that the task of putting the naysayers straight seems to involve the dredging of media archives for adverts and "reviews", only for people to misrepresent what has been written very clearly already in this thread, I rather do feel like I'm done wasting my time digging stuff up for people to read when they just shoot the messenger, anyway.
(Oh, and that overlaying technique. Does the Domesday System use mode 7 for overlaying or not? That would have been an obvious application, but all I seem to remember from screenshots is a bitmap mode being synchronised with the video. Oh well: I hope people could read the text.)