Search found 281 matches

by Diminished
Wed Apr 22, 2020 4:16 pm
Forum: archive requests
Topic: Wizadore - corruption
Replies: 30
Views: 958

Re: Wizadore - corruption

Yeah my first thought on reading this topic was "... wasn't this Kevin Edwards again?" I'm not sure what the "cleanest" way of de-protecting one of these would be. I suppose you'd want to keep as much of the loader code intact as possible, but maybe save out unencrypted blocks at each stage instead ...
by Diminished
Wed Apr 22, 2020 4:09 pm
Forum: 8-bit acorn emulators
Topic: New emulator: beebjit
Replies: 51
Views: 2181

Re: New emulator: beebjit

Fixed link >_>
Sterling work, though.
by Diminished
Sun Apr 19, 2020 2:49 pm
Forum: 8-bit acorn software: other
Topic: DFS floppy capacity and dsd format
Replies: 15
Views: 467

Re: DFS floppy capacity and dsd format

If you want maximum compatibility then I think you have to settle for just 100K total, which is a single sided 40 track DFS disc.
by Diminished
Thu Apr 16, 2020 12:19 am
Forum: 8-bit acorn emulators
Topic: New emulator: beebjit
Replies: 51
Views: 2181

Re: New emulator: beebjit

I recalled seeing the pext thing mentioned somewhere else recently:

https://dolphin-emu.org/blog/2020/02/07 ... by-techjar
by Diminished
Tue Apr 14, 2020 3:25 pm
Forum: 8-bit acorn emulators
Topic: New emulator: beebjit
Replies: 51
Views: 2181

Re: New emulator: beebjit

This is the Kate Crennell implementation of Mandelbrot from Beebug 5.1 (not 4.9), if anyone else fancies messing with it. I could only find this on tape (from STH), so I put it on disc. (CHAIN "MANDEL"). Once a plot has completed, use the cursor keys to choose the bottom-left corner of the box you w...
by Diminished
Tue Apr 14, 2020 2:25 pm
Forum: 8-bit acorn emulators
Topic: New emulator: beebjit
Replies: 51
Views: 2181

Re: New emulator: beebjit

Great news! But because I don't fully understand all the tech involved, it would be great if you could please explain in simple terms what the advantages of beebjit are over BeebEm, to take the obvious example? (Apart from beebjit's ability to read HFEs -- I get that bit.) Basically it can run BBC ...
by Diminished
Tue Apr 14, 2020 11:54 am
Forum: 8-bit acorn emulators
Topic: New emulator: beebjit
Replies: 51
Views: 2181

Re: New emulator: beebjit

I enjoyed reading about all of the weird and wonderful copy protection tricks that various developers used. I still love the irony that Kevin Edwards' Nightshade protection system -- which superficially one would think would be something that would make preservation efforts more difficult -- instea...
by Diminished
Tue Apr 14, 2020 1:47 am
Forum: 8-bit acorn emulators
Topic: New emulator: beebjit
Replies: 51
Views: 2181

Re: New emulator: beebjit

Thanks! It's great to see this running on peoples' machines other than mine. Is that with the command line in the EXAMPLES file? No, sorry! I confess I didn't spot that! I just ran it with "-fast", and then minimised the window to avoid video overhead. With the recommended CLI from EXAMPLES it does...
by Diminished
Tue Apr 14, 2020 1:02 am
Forum: 8-bit acorn emulators
Topic: New emulator: beebjit
Replies: 51
Views: 2181

Re: New emulator: beebjit

Thought it might be interesting to give CLOCKSP a try on my box -- an aging Intel i7-4790K which is nevertheless overclocked to the same 4.5 GHz as the i9 mentioned on the blog.
Screenshot_20200414_010102.png

This is a strange way of doing benchmarks, but not too shabby!
by Diminished
Mon Apr 13, 2020 11:43 pm
Forum: 8-bit acorn emulators
Topic: New emulator: beebjit
Replies: 51
Views: 2181

Re: New emulator: beebjit

I am a big fan of the inherent poetry in the phrase "caches and pipelines and reordering and pain". I've always had a vague idea of how JITs must work, but I've never really seen any specific details, so the writeup is very helpful in this regard, particularly since the 6502 is so simple. (How they ...
by Diminished
Mon Apr 13, 2020 9:32 am
Forum: new projects and releases: demoscene
Topic: BEEB-NICCC: New Bitshifters demo released at Revision 2020
Replies: 15
Views: 930

Re: BEEB-NICCC: New Bitshifters demo released at Revision 2020

Excellent work, guys.

Once again kieran (et al)'s work leaves me wishing I had a Master.
by Diminished
Sun Apr 12, 2020 3:57 pm
Forum: off-topic
Topic: Electronics 101 help needed - transitors as a relay
Replies: 9
Views: 455

Re: Electronics 101 help needed - transitors as a relay

Off-topic, but I've never seen one of those component analysers before. That looks like a handy bit of kit.
by Diminished
Sun Apr 12, 2020 1:56 pm
Forum: off-topic
Topic: Easter Greetings
Replies: 2
Views: 195

Re: Easter Greetings

I laughed.

Happy Easter.
by Diminished
Sat Apr 11, 2020 9:13 pm
Forum: past virtual ABug events
Topic: All-day 'Virtual' Acorn session #1, Saturday 11th April 2020, 9am - 5pm
Replies: 97
Views: 2936

Re: Second 'Virtual ABug', Saturday 11th April, 9am - 5pm

SimonSideburns wrote:
Sat Apr 11, 2020 8:27 pm
Bonus points for naming everyone on this image.
First two are easy ...
by Diminished
Fri Apr 10, 2020 4:09 pm
Forum: introduce yourself
Topic: Hello
Replies: 12
Views: 432

Re: Hello

jonnyboy wrote:
Thu Apr 09, 2020 12:52 pm
SplitSecond
Great game. Got all gold medals on that.
by Diminished
Fri Apr 10, 2020 12:56 pm
Forum: 8-bit acorn software: classic games
Topic: Repton 3: Emulator/RNG issue
Replies: 76
Views: 2984

Re: Repton 3: Emulator/RNG issue

Just quickly, I took a RAM dump of the PIAS2 version and ran it through my diffing process. The PIAS2 version seems to be identical to v2 (as predicted by Bill's Cheat It Again, Joe research and observation that CIAJ only supported two versions total). The next targets, then, are the expansion pack ...
by Diminished
Fri Apr 10, 2020 11:53 am
Forum: 8-bit acorn software: classic games
Topic: Using Strykers Run footage in music video?
Replies: 5
Views: 380

Re: Using Strykers Run footage in music video?

As long as you recorded your own clips to use then you are not infringing copyright AFIK. I'm not sure this is the case, actually. For example, Nintendo in particular were very unhelpful in the earlier days of YouTube regarding people making videos of gameplay of their titles ( an example , and ano...
by Diminished
Fri Apr 10, 2020 4:09 am
Forum: 8-bit acorn software: classic games
Topic: Repton 3: Emulator/RNG issue
Replies: 76
Views: 2984

Re: Repton 3: Emulator/RNG issue

Righto, here are the v1 -> v2 changes. I think this is comprehensive, but hey, I screw up a lot. Obviously there are a ton of other binary differences between the two executables, but to the best of my observation everything not mentioned here is just reassembled addresses. The addresses at the star...
by Diminished
Mon Apr 06, 2020 12:12 pm
Forum: 8-bit acorn software: classic games
Topic: Repton 3: Emulator/RNG issue
Replies: 76
Views: 2984

Re: Repton 3: Emulator/RNG issue

Hi, l would say we should go back to basics and create new versions from BillC's originals.... OK, Having dug through some magazine reviews of these games, the release timeline was as follows: Repton 3: December 1986. Reviewed in Micro User Dec '86, Computer Gamer Dec '86, and A&B Computing Jan '87...
by Diminished
Mon Apr 06, 2020 12:07 pm
Forum: 8-bit acorn software: classic games
Topic: Repton 3: Emulator/RNG issue
Replies: 76
Views: 2984

Re: Repton 3: Emulator/RNG issue

So, it seems there has been some confusion, most of which is probably my fault. The only version that we have found so far with the bug is the very first Repton 3 stand-alone full-price disc release (which we've been calling "v1"). This seems to be the version that's on Stairway to Hell (or at least...
by Diminished
Sun Apr 05, 2020 6:57 pm
Forum: off-topic
Topic: Electronics 101 help needed - transitors as a relay
Replies: 9
Views: 455

Re: Electronics 101 help needed - transitors as a relay

I think you want something like this: https://reviseomatic.org/help/e-MOSFET-BJT/Bipolar-Transistor-Switch.gif The base resistor is necessary to avoid blowing up the transistor. The diode is also necessary ... to avoid blowing up the transistor. In grossly oversimplified terms, NPN and PNP are oppos...
by Diminished
Sun Apr 05, 2020 12:55 pm
Forum: 8-bit acorn software: classic games
Topic: Repton 3: Emulator/RNG issue
Replies: 76
Views: 2984

Re: Repton 3: Emulator/RNG issue

Yeah, I realised yesterday that -- because I'm a dummy -- I'd been comparing a disc version (Bill Carr v1) to a tape version (bbcmicro.co.uk), which certainly explains some of the wilder differences I found. ("Why is this OSFILE stuff so starkly different? Ohhhh ...") Provided the level editor is in...
by Diminished
Sat Apr 04, 2020 4:09 pm
Forum: 8-bit acorn software: classic games
Topic: Repton 3: Emulator/RNG issue
Replies: 76
Views: 2984

Re: Repton 3: Emulator/RNG issue

I had 4 disc copies of Repton 3, three with the gold "Superior Software DO NOT REMOVE" write protect stickers and one with plain black stickers. The three didn't have LDA#&FF on sector &15D, offset &AB, but the other one did, so seems like a fixed version was released. That sleeve also contains a c...
by Diminished
Sat Apr 04, 2020 2:08 pm
Forum: 8-bit acorn software: classic games
Topic: Repton 3: Emulator/RNG issue
Replies: 76
Views: 2984

Re: Repton 3: Emulator/RNG issue

Hi, no problem, if we find something wrong then we need to post it here for testing as there are enough of us to fix just about any issue. Just one thing, did you try both D024's I posted or just the fix as if the original one I posted lastly was OK, then I can leave it as it is. thanks Mick. Hi Mi...
by Diminished
Sat Apr 04, 2020 1:19 pm
Forum: 8-bit acorn software: classic games
Topic: Repton 3: Emulator/RNG issue
Replies: 76
Views: 2984

Re: Repton 3: Emulator/RNG issue

OK. Here's a test for whatever versions you lovely folks have. If you can complete Screens A and B then your version is bug-free. If you can't, it isn't. Because of the unpredictable way the fungus grows (i.e. sometimes it doesn't), it might be worth playing it twice, just to be sure. Load the game ...
by Diminished
Sat Apr 04, 2020 10:06 am
Forum: 8-bit acorn software: classic games
Topic: Repton 3: Emulator/RNG issue
Replies: 76
Views: 2984

Re: Repton 3: Emulator/RNG issue

Could someone please playtest this version to see if it contains a fixed version or not. Originally, the game would have come from the tape, but on re-mastering a few years back, I may have used a disc version from later issues without realising the original fault. Hi Mick. Sorry to mess you around...
by Diminished
Sat Apr 04, 2020 8:53 am
Forum: introduce yourself
Topic: evening from york
Replies: 12
Views: 725

Re: evening from york

Hello!
philbo34 wrote:
Fri Apr 03, 2020 8:39 pm
as usual cant stand having anything that doesnt appear to work
This is the correct attitude!
by Diminished
Fri Apr 03, 2020 10:37 pm
Forum: 8-bit acorn software: classic games
Topic: Repton 3: Emulator/RNG issue
Replies: 76
Views: 2984

Re: Repton 3: Emulator/RNG issue

It would be useful if there was a quick and simple way of identifying whether a copy has this bug fixed or otherwise. I have original floppy copies of Repton 3, ATWIFS, LOR and RTT, so would be interesting to see if they have the bug. (incidentally, I had also wondered if it had been fixed in house...
by Diminished
Fri Apr 03, 2020 8:27 pm
Forum: 8-bit acorn software: classic games
Topic: Repton 3: Emulator/RNG issue
Replies: 76
Views: 2984

Re: Repton 3: Emulator/RNG issue

The plot thickens. It's been bothering me -- I just refused to believe this bug wasn't fixed at some point back in the day. Repton 3 was obviously very popular, else Superior wouldn't have seen profitability in releasing three expansion packs. Somebody had to have encountered this one on a normal pl...
by Diminished
Fri Apr 03, 2020 9:03 am
Forum: off-topic
Topic: Which retro calculator is best?
Replies: 29
Views: 973

Re: Which retro calculator is best?

You were lucky in the 90s - you had calculators. When I did my exams 'when I were a lad' we had to use 4-figure maths tables for sines, cosines, tangents and calculation using logarithms. :lol: I found a book of 7-figure tables in WH Smiths and thought I was in heaven. :wink: I think we had it luck...

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