Search found 26 matches

by stephen_usher
Sat May 12, 2018 11:41 am
Forum: Software & Programming
Topic: SuperCharge Decompiler
Replies: 26
Views: 1364

Re: SuperCharge Decompiler

Martin_Head wrote:By sod's law both routines have the same checksum! They both have the same number of bytes, and only differ by 2 bytes, and the two differences cancel each other out in the checksum.


Use a cryptographic hash instead, such as md5sum or even 3des?
by stephen_usher
Fri May 11, 2018 11:00 pm
Forum: Software & Programming
Topic: Inspired to extract my old code from a floppy.
Replies: 5
Views: 285

Re: Inspired to extract my old code from a floppy.

Thanks! I'll look into it. With regard to your floppies, did you try soaking them in isopropyl alcohol? I've managed to recover quite a few that way. Sometimes the old lubricant just gets too sticky and the platter gets stuck. Sometimes it's the coating itself. Sometimes I can only read them when th...
by stephen_usher
Fri May 11, 2018 9:17 pm
Forum: Software & Programming
Topic: Inspired to extract my old code from a floppy.
Replies: 5
Views: 285

Inspired to extract my old code from a floppy.

The starting assembly programming thread inspired me last night to try to extract my code for the terminal emulator I wrote in 1988/89 from the development floppy. First I had to get an image and I managed to do this via macOS using 'dd' in a terminal. That was the easy bit. Finding a useful emulato...
by stephen_usher
Thu May 10, 2018 7:54 pm
Forum: Software & Programming
Topic: How to start programming with assembly?
Replies: 69
Views: 5802

Re: How to start programming with assembly?

A long time ago, in a galaxy far, far away... I started programming on the QL using the Computer One assembler/editor/monitor suite plus the "QL Advanced User Guide" from Adder Publishing. They were both fine for the job. I know that the C1 stuff has been preserved but I don't know where y...
by stephen_usher
Wed Oct 04, 2017 9:31 pm
Forum: The Off-Topic Section
Topic: You know you're a QLer when...
Replies: 18
Views: 2989

Re: You know you're a QLer when...

they hit F2 for the TV.
by stephen_usher
Sun Oct 01, 2017 12:24 pm
Forum: Hardware
Topic: Scart to HDMI upscaler
Replies: 25
Views: 3180

Re: Scart to HDMI upscaler

I've just tested one of the metal box with white lettering units from eBay and it loses 4 characters from the right-side of the screen.
by stephen_usher
Sun Sep 24, 2017 9:17 am
Forum: Hardware
Topic: Scart to HDMI upscaler
Replies: 25
Views: 3180

Re: Scart to HDMI upscaler

That's because the QL's output is outside the standard for 4:3 TV scan lines. This is why there was a special monitor sold to complement the machine.
by stephen_usher
Wed Sep 20, 2017 10:47 pm
Forum: Hardware
Topic: vDrive ZX: emulated ZX Microdrive
Replies: 25
Views: 3057

Re: vDrive ZX: emulated ZX Microdrive

Any thoughts about an internal version for the QL?
by stephen_usher
Wed Sep 20, 2017 12:47 pm
Forum: Hardware
Topic: vDrive ZX: emulated ZX Microdrive
Replies: 25
Views: 3057

Re: vDrive ZX: emulated ZX Microdrive

From the article it seems like it's still in development and testing, so no pricing.
by stephen_usher
Wed Sep 20, 2017 10:56 am
Forum: Hardware
Topic: vDrive ZX: emulated ZX Microdrive
Replies: 25
Views: 3057

Re: vDrive ZX: emulated ZX Microdrive

I'd just seen that and was going to post about it. Looks very interesting.

Note: the 129K (or 126K) quoted seems to be a restriction of the ZX Interface 1 and not the device, so this is likely to be different on the QL.

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