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by janbredenbeek
Sat Nov 18, 2017 12:04 pm
Forum: Hardware
Topic: Q68 Notice 3 - Update
Replies: 28
Views: 874

Re: Q68 Notice 3 - Update

Hi Peter, A few more general points, when it comes to Q68 purchase decisions: 3. Ethernet: This was only tested on a hardware level. Although I had some experience with QL native TCP/IP and ethernet 15 years ago, I can not promise to release driver software for the Q68. It is possible that I do some...
by janbredenbeek
Wed Nov 15, 2017 9:49 pm
Forum: Hardware
Topic: Engineering mules....
Replies: 16
Views: 575

Re: Engineering mules....

Hi Nasta, Thanks for the extensive explanation, though I have one small correction: IPL1 generates interrupt level 2, not 1. The original 68000 had three lines IPL0, 1 and 2, corresponding to the binary equivalent of the interrupt levels. On the 68008 IPL0 and 2 are tied together giving Level 5 when...
by janbredenbeek
Wed Nov 15, 2017 2:29 pm
Forum: Hardware
Topic: Engineering mules....
Replies: 16
Views: 575

Re: Engineering mules....

Full recovery may not be possible. True, you don't know what already has been corrupted by the time you press CTRL-ALT-7. It's use is mainly to inspect memory and registers for debugging purposes rather than to give you a chance to save your work after a crash (which you should do regularly anyway)...
by janbredenbeek
Tue Nov 14, 2017 4:11 pm
Forum: Hardware
Topic: Engineering mules....
Replies: 16
Views: 575

Re: Engineering mules....

I remember that article from QL User, but can't remember whether it actually worked. It apparently doesn't attempt to reset the 8049. Jan, as far as I remember, this shouldn't be necessary - The 8049 resets itself already when seeing <CTRL><ALT>7 after sleeping for a while. Before that, it issues t...
by janbredenbeek
Tue Nov 14, 2017 2:29 pm
Forum: Hardware
Topic: Engineering mules....
Replies: 16
Views: 575

Re: Engineering mules....

Hi, just wandering what is the line, ZX8302 uses to raise `mdv gap interrupt' to MC6800. IPL1? It's used to read the microdrives - when a gap on the tape passes the head the interrupt is triggered so the 68008 can read in the sector or sector header. It's also used for the 50Hz interrupt - QDOS onl...
by janbredenbeek
Wed Nov 08, 2017 3:06 pm
Forum: General QL Chat
Topic: Error message on #1
Replies: 8
Views: 393

Re: Error message on #1

Hi Christian I would doubt an MDV hardware fault giving rise to the #0/#1 message behaviour. As for #0 being free or busy - if the cursor has already returned and flashing - as is often the case once the save routine has successfully written and during the automatic verify phase - then #0 will be '...
by janbredenbeek
Mon Oct 30, 2017 8:56 am
Forum: Software & Programming
Topic: FTYP of sub-directories on SDC...
Replies: 11
Views: 567

Re: FTYP of sub-directories on SDC...

As I remember from a TT interview in QL Today, the original idea behind duplicating the header information in both the directory and file itself was to make microdrives more robust against a damaged directory file. Incidentally, the MDV driver stores the complete file information in the file header ...
by janbredenbeek
Sun Oct 29, 2017 2:19 pm
Forum: Software & Programming
Topic: A guide to programming the Sinclair QL
Replies: 25
Views: 1183

Re: A guide to programming the Sinclair QL

I've written several programs in C when I was already an experienced QL coder (it was not before the early 90s when C68 appeared which was the first decent C compiler for the QL). I even wrote a library in C to implement pop-up windows and menus as I didn't want to rely on the PE when distributing p...
by janbredenbeek
Sat Oct 28, 2017 9:25 am
Forum: Hardware
Topic: QL MODE 8 Flash Bit
Replies: 12
Views: 644

Re: QL MODE 8 Flash Bit

I've done it in a Videotex/Viewdata/Prestel terminal program. [...] That explains how well you knew about the Flash bit details! Thanks for explaining it on ql-users! Pity that your program will hardly be of use on the Q68... Now when I think of it... Teletext is still being used here in NL, it's e...
by janbredenbeek
Sat Oct 28, 2017 12:31 am
Forum: Hardware
Topic: QL MODE 8 Flash Bit
Replies: 12
Views: 644

Re: QL MODE 8 Flash Bit

I wonder how many apps ever made use of FLASH... I've done it in a Videotex/Viewdata/Prestel terminal program. But it was hard to implement as the standard supports block graphic characters which need to be fully contiguous, which the standard QL driver cannot produce (it always prints characters w...

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