Search found 640 matches

by scarybeasts
Fri Feb 26, 2021 6:21 am
Forum: archive submissions
Topic: Trivial Pursuit, Young Players Edition: assembly source code, cross-compiled (from C64?)
Replies: 0
Views: 54

Trivial Pursuit, Young Players Edition: assembly source code, cross-compiled (from C64?)

Hi, [Again, not my discovery! Thanks to our anonymous friend for finding all this fascinating content.] A zip with the HFEs is attached, as is a zip with some extracted assembler files. The files are just sitting around the DFS catalog! It's not known if all the Trivial Pursuit, Young Player Edition...
by scarybeasts
Thu Feb 25, 2021 10:41 pm
Forum: archive submissions
Topic: Repton Infinity: Exile artifact?!
Replies: 0
Views: 65

Repton Infinity: Exile artifact?!

Hi, [Again: not my discovery or code. Credit to a legend who prefers to remain anonymous.] Attached is a bundle of HFEs for one of the Repton Infinty variants we have. Also attached is a piece of code that will access raw sectors from the Repton Infinity disc to reveal a surprise image. This time, I...
by scarybeasts
Thu Feb 25, 2021 9:16 am
Forum: archive submissions
Topic: Starting an archive of HFE protected disc files
Replies: 97
Views: 7160

Re: Starting an archive of HFE protected disc files

The fact that I can't get any to load makes me suspect I'm doing something wrong. However, if I create a hfe file using Greaseweazle, it loads up in HxCFloppyEmulator just fine. That HxCFloppyEmulator version looks a bit old. I have v2.5.6.7 and I took the first HFE (Elite) and it loads fine. Cheer...
by scarybeasts
Thu Feb 25, 2021 8:31 am
Forum: archive submissions
Topic: Starting an archive of HFE protected disc files
Replies: 97
Views: 7160

Re: Starting an archive of HFE protected disc files

KenLowe wrote:
Thu Feb 25, 2021 7:55 am
Do you know why the HFE files in your archive (at least the ones I've tried) won't load into HxCFloppyEmulator?
Can you give a link to a specific HFE or two? And I'll check them out.


Cheers
Chris
by scarybeasts
Thu Feb 25, 2021 7:45 am
Forum: archive submissions
Topic: Empire Strikes Back: oddity with Summer Olympiad, and possible source fragments
Replies: 0
Views: 64

Empire Strikes Back: oddity with Summer Olympiad, and possible source fragments

Hi, [Again, forwarding along an interesting discovery on behalf of someone else. Not my discovery and not my code!] The beeb archiving effort has captured 4x Empire Strikes Back discs so far. They all have the same fingerprint, but that doesn't necessarily make it a boring disc... there's actually a...
by scarybeasts
Thu Feb 25, 2021 6:42 am
Forum: programming
Topic: 50fps?
Replies: 17
Views: 431

Re: 50fps?

Very few were 50fps, but those that were really stood out. I can think of Contraption, Pipeline, maybe Firetrack? I think this is a wonderful cue for discussion! It celebrates the most skillfully coded games from back in the day. My additions for consideration: - Syncron. Notoriously too fast? Prob...
by scarybeasts
Thu Feb 25, 2021 1:43 am
Forum: archive submissions
Topic: Starting an archive of HFE protected disc files
Replies: 97
Views: 7160

Re: Starting an archive of HFE protected disc files

I've just downloaded a couple of .hfe files from the archive (Level 9 Colossal Adventure & Snowball Adventure), and copied these over to my gotek (Flashfloppy v3.23) but I get a disk fault 0E with both of them when trying to read the disk (1770 controller / DFS2.26). If I try loading the .hfe i...
by scarybeasts
Wed Feb 24, 2021 12:38 pm
Forum: 8-bit acorn emulators
Topic: Machine Code Profiler
Replies: 9
Views: 254

Re: Machine Code Profiler

Has anyone considered doing a machine code profiler for the Beeb? It seems like something that could be put into an emulator, A 64K x Integer array that holds a count for each memory location. It would increment when an instruction is executed there. Maybe when displayed it could also multiply the ...
by scarybeasts
Fri Feb 19, 2021 8:03 pm
Forum: archive submissions
Topic: Winter Olympiad 88: 40T side mis-master, revealing copy protection 6522 simulator?!
Replies: 5
Views: 229

Re: Winter Olympiad 88: 40T side mis-master, revealing copy protection 6522 simulator?!

billcarr2005 wrote:
Fri Feb 19, 2021 4:06 pm
I've managed to piece together the complete program.
What an unexpected win! :D


Cheers
Chris
by scarybeasts
Fri Feb 19, 2021 8:36 am
Forum: 8-bit acorn software: other
Topic: Discbeast, new disc and archival utility -- NEED VOLUNTEERS
Replies: 102
Views: 6645

Re: Discbeast, new disc and archival utility -- NEED VOLUNTEERS

Yes I was also wondering how where the computers linked for this game. So if you pick "run slave loader" from the menu and then have a look at what it's doing: [ITRP] 06EB: DEX [ITRP] 06EC: BEQ $06FC [ITRP] 06EE: LDA $FE6D [ITRP] 06F1: AND #$10 [ITRP] 06F3: BEQ $06EB [ITRP] 06F5: LDA $FE6...
by scarybeasts
Fri Feb 19, 2021 8:07 am
Forum: 8-bit acorn software: other
Topic: Discbeast, new disc and archival utility -- NEED VOLUNTEERS
Replies: 102
Views: 6645

Re: Discbeast, new disc and archival utility -- NEED VOLUNTEERS

Here's a Discbeast image of Double Phantom; the 2-computer, dual player version of Phantom Combat. CRC32 B892E2D I imaged both sides of the disc, but side 2 seems unformatted. Thanks! Added to the archive. Looks like an interesting disc -- it's got the crazy Western Security disc protection: Disc b...
by scarybeasts
Thu Feb 18, 2021 9:41 am
Forum: archive submissions
Topic: Winter Olympiad 88: 40T side mis-master, revealing copy protection 6522 simulator?!
Replies: 5
Views: 229

Winter Olympiad 88: 40T side mis-master, revealing copy protection 6522 simulator?!

Hi, I think this is a great find! Credit for this one goes to an anonymous individual I'm working with to fingerprint and archive their disc collection. Raise your glass to them :) We've found various Winter Olympiad 88 variants. One is fairly unusual: the 40 track side appears to have been mastered...
by scarybeasts
Thu Feb 18, 2021 7:57 am
Forum: 8-bit acorn hardware
Topic: Request test by some kind member with an 8271 and Gotek setup
Replies: 2
Views: 127

Request test by some kind member with an 8271 and Gotek setup

Hi, I don't currently have an 8271 beeb setup (and the kids smashed the TV on the 1770 beeb :evil: ), so I'm wondering if someone with an 8271 + Gotek setup would be kind enough to to try the attached Fire Track HFE? It's a borderline capture, so the test is pretty simple: boot the disc, and what ha...
by scarybeasts
Thu Feb 18, 2021 3:09 am
Forum: 8-bit acorn software: classic games
Topic: What a lovely gift from Scarybeasts of this parish
Replies: 7
Views: 374

Re: What a lovely gift from Scarybeasts of this parish

Mine also has the dot-matrix-style disc label, but more interestingly the original owner had created a lovingly hand-drawn map, stuck together with now-brittle sellotape. I wonder if anyone here recognizes it? That map is a wonderful piece of work! Your dot-matrix disc label is different to the oth...
by scarybeasts
Thu Feb 18, 2021 12:54 am
Forum: 8-bit acorn emulators
Topic: beebjit-0.9.5 release: a story in pictures
Replies: 12
Views: 680

Re: beebjit-0.9.5 release: a story in pictures

TechieKeith wrote:
Thu Feb 18, 2021 12:43 am
Those tests also look really useful too. Where can I get hold of the "teletest" test?
It lives here: https://github.com/scarybeasts/beebjit/ ... est_v1.ssd


Cheers
Chris
by scarybeasts
Wed Feb 17, 2021 9:09 am
Forum: 8-bit acorn software: classic games
Topic: What a lovely gift from Scarybeasts of this parish
Replies: 7
Views: 374

Re: What a lovely gift from Scarybeasts of this parish

Cheers mate! You're welcome -- and also credit to my co-conspirator VectorEyes who handled a lot of UK logistics. He also discbeast'ed the disc to check its fingerprint. The disc reads fine and it matches the few other Starquakes we've captured. We haven't found any variants yet, so does this sugge...
by scarybeasts
Wed Feb 17, 2021 5:59 am
Forum: 8-bit acorn emulators
Topic: beebjit-0.9.5 release: a story in pictures
Replies: 12
Views: 680

beebjit-0.9.5 release: a story in pictures

Hi, beebjit-0.9.5 is out. As always, it lives on Github: https://github.com/scarybeasts/beebjit The v0.9.5 Windows build is here: https://github.com/scarybeasts/beebjit/blob/master/builds/beebjit_win_0.9.5.zip There's been plenty of work, with continued focus on where beebjit strives to do well: acc...
by scarybeasts
Tue Feb 16, 2021 5:28 am
Forum: programming
Topic: question about 76489 sound programming from assembler
Replies: 12
Views: 341

Re: question about 76489 sound programming from assembler

Hi, Here's the MOS1.2 sound routine. (Hit tip to http://mdfs.net/Docs/Comp/BBC/OS1-20/EAD9) It doesn't explicitly delay between writing the bus value and turning on the sound chip. But it does seem to delay after turning off the sound chip. EB22 SEI ;disable interrupts EB23 LDY #&FF ;System VIA ...
by scarybeasts
Mon Feb 15, 2021 2:09 am
Forum: 8-bit acorn emulators
Topic: Adventures in emulation
Replies: 42
Views: 1180

Re: Adventures in emulation

Thanks for sharing the Chuckie Egg screenshots with the mistimings ThomasHarte! It's always good to know one is not alone in having these mishaps :-) No game screenshots this time from me. I've been mostly working on putting together a configuration menu. Ah, I love this idea! A built-in MODE7 styl...
by scarybeasts
Sun Feb 14, 2021 2:43 am
Forum: 8-bit acorn software: other
Topic: Mini Office
Replies: 15
Views: 7678

Re: Mini Office

Is there any interest in variants of Mini Office / Mini Office 2?

The original disc archiving effort has now encountered variants of both where some of the DFS program files are different.


Cheers
Chris
by scarybeasts
Fri Feb 12, 2021 8:45 am
Forum: 8-bit acorn emulators
Topic: Adventures in emulation
Replies: 42
Views: 1180

Re: All the CPU bugs are unearthed

Fast forward to this week, when I decided to try to progress from getting Chuckie Egg working, to getting Elite working. This required a lot of improvements to video emulation - during which I discovered that if I was deinterlacing video, I really didn't need to run at 50fps, which was lucky for th...
by scarybeasts
Fri Feb 12, 2021 3:20 am
Forum: archive submissions
Topic: Citadel, standalone disc, Master compatible
Replies: 5
Views: 286

Re: Citadel, standalone disc, Master compatible

Nice. More history! With thanks to billcarr, attached is another unusual Citadel. It's a "sample" disc. Perhaps it's the same as the "early" or "pre-release" Citadels floating around such as http://bbcmicro.co.uk/game.php?id=2396 or the one in the STH. Unlike the "...
by scarybeasts
Fri Feb 12, 2021 2:34 am
Forum: archive submissions
Topic: Citadel, standalone disc, Master compatible
Replies: 5
Views: 286

Re: Citadel, standalone disc, Master compatible

Diminished wrote:
Sun Feb 07, 2021 12:24 pm
Nice. More history!
Related, I just accidentally noticed the Citadel notes at https://www.stairwaytohell.com/cheats/h ... n6-b-L.jpg, while researching Perplexity.

It goes a bit into how Citadel was ported to the Master, and who did it.


Cheers
Chris
by scarybeasts
Fri Feb 12, 2021 12:55 am
Forum: 8-bit acorn software: classic games
Topic: Perplexity variant (uncompleteable game!) and a puzzle / challenge
Replies: 2
Views: 195

Perplexity variant (uncompleteable game!) and a puzzle / challenge

Hi, Attached is a zip with 2 Perplexity variants (standalone disc release). The 1B63D371 variant is the earlier release and is allegedly not completeable due to an errant wall section on level 8! The D0DA71BB variant has this fixed. I learned of this from a HacMan article (boxed in green), archived ...
by scarybeasts
Thu Feb 11, 2021 2:33 am
Forum: 8-bit acorn emulators
Topic: 6845 CRTC Reprogram Start Address
Replies: 2
Views: 189

Re: 6845 CRTC Reprogram Start Address

Does anyone know if a real 6845 allows the screen start address (registers 12 and 13) to be re-programmed part way down the screen? You can reprogram them, but they won't take effect until the start of the next 6845 frame. There are plenty of tricks to display multiple horizontal slices in a single...
by scarybeasts
Sun Feb 07, 2021 7:55 am
Forum: archive submissions
Topic: Citadel, standalone disc, Master compatible
Replies: 5
Views: 286

Citadel, standalone disc, Master compatible

Hi, I've attached an HFE of an interesting Citadel disc image. It's the original standalone release, but a later release (13 in the DFS cycle count, V1.3?) that is Master compatible. I didn't know these existed until someone sent me to add to the HFE archive. I thought only the Play It Again Sam was...
by scarybeasts
Sun Feb 07, 2021 6:51 am
Forum: 8-bit acorn software: classic games
Topic: Repton 1 different versions?
Replies: 2
Views: 349

Re: Repton 1 different versions?

I notice that this file is different across the discs: D.REPTON1 002FD0 002FD0 0013FF (two earlier discs) D.REPA 002FD0 0043A0 0013FF (later disc) This was bothering me. The logic here is that since the D.REPTON0 loader file is the same, then a difference in D.REPTON1 must be significant. So I look...
by scarybeasts
Wed Feb 03, 2021 7:54 pm
Forum: 8-bit acorn emulators
Topic: How do the various emulators pace themselves?
Replies: 27
Views: 956

Re: How do the various emulators pace themselves?

That said, I simplified to just using the high-frequency timer because it keeps me filling the audio queue regularly enough that it’s not a specific concern. I'm particularly curious about this piece above. If you trust the high-freq timer as the source of time, does that ever "drift" vs....
by scarybeasts
Wed Feb 03, 2021 4:54 am
Forum: 8-bit acorn emulators
Topic: How do the various emulators pace themselves?
Replies: 27
Views: 956

Re: How do the various emulators pace themselves?

That does make sense - but there's a limit, because fast-reaction games will not play well with poor (or very variable) keyboard latency. Most likely, that limit is much greater than the likely N for how many instructions to run, as a maximum. This is an interesting topic for sure. Many emulators w...

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