Search found 91 matches

by Diminished
Fri Sep 14, 2018 7:23 pm
Forum: software: classic games
Topic: Unused Citadel bits
Replies: 43
Views: 3770

Re: Unused Citadel bits

I went back to looking at my PHP reimplementation of the room unpacker, armed with the latest snapshot of b-em. I found a couple of bugs, so I'm getting a little closer. It now gets through about 80% of the bytes representing The Well Wheel (previously it was doing fewer than 50% before giving up), ...
by Diminished
Thu Sep 13, 2018 1:52 pm
Forum: emulators
Topic: b2 - new emulator
Replies: 113
Views: 8445

Re: b2 - new emulator

I built this on Linux last night, and it looks very promising. I was able to confirm the veracity of various parts of my Citadel disassembly just by ogling the memory viewer while the game ran. Is tracing currently broken in the github version? I get the menu option to switch it on and off ("Tracing...
by Diminished
Fri Aug 24, 2018 10:47 am
Forum: general
Topic: Beeb Spotting
Replies: 30
Views: 3378

Re: Beeb Spotting

Elminster wrote:
Fri Aug 24, 2018 8:16 am
Beebs in the US. It will never catch on. :evil:
Make Acorn Great Again?

(... sorry)
by Diminished
Wed Jun 06, 2018 12:02 am
Forum: upcoming and recent events & exhibitions
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 203
Views: 6920

Re: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD

Depends if you want to bring kit along and have desk space available for you. If you just want to look around, you can just "rock up". AFAIK. Not unless some poor soul has a desperate desire to see my cruddy, unfinished homemade computer (two Cortex M3s, 512K VGA board I designed in KiCAD, video me...
by Diminished
Tue Jun 05, 2018 10:34 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 203
Views: 6920

Re: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD

jbnbeeb wrote:
Sun Jun 03, 2018 6:08 pm
(and I *think* an ASDA)
Can confirm this -- it's just on the other side of the railway bridge.

Is it necessary to book this in advance, or can we just rock up on the weekend? I live within walking distance, but I'm somewhat at the mercy of other factors.
by Diminished
Mon Apr 30, 2018 11:20 am
Forum: software: classic games
Topic: Citadel Item Randomiser 0.4 (updated)
Replies: 42
Views: 4353

Re: Citadel Item Randomiser 0.4 (updated)

I didn't realize how non-linear the game layout was until you play it like this. From memory, I think it turns out that something like 10% of all possible permutations can be completed for the full 99 points, which is higher than I expected. I agree that it's a different experience to how it would ...
by Diminished
Thu Apr 19, 2018 5:43 pm
Forum: software: new games
Topic: Maze of Madness
Replies: 26
Views: 2600

Re: Maze of Madness

OK, I solved it, finally.

There was a brief moment of horror when I figured it out. All I'll say is that I've experienced something like this before.
by Diminished
Wed Apr 18, 2018 11:56 pm
Forum: software: new games
Topic: Maze of Madness
Replies: 26
Views: 2600

Re: Maze of Madness

Well, I know of one way to solve it, but I think it's a bug. At least, after the hype it felt like an anticlimax. But given the date and time it was published, I wondered if that was perhaps the intention. Having thought about it a bit more, now I'm thinking actually maybe the bug was unintentional,...
by Diminished
Wed Apr 18, 2018 8:20 pm
Forum: software: new games
Topic: Maze of Madness
Replies: 26
Views: 2600

Re: Maze of Madness

*shakes head*
by Diminished
Tue Apr 17, 2018 3:45 am
Forum: emulators
Topic: B-Em
Replies: 381
Views: 23556

Re: B-Em

Looks like good work Coeus. I'll be sure to check this out soon.
by Diminished
Sat Apr 07, 2018 8:19 am
Forum: emulators
Topic: Which Emulator for BBC Micro on Linux?
Replies: 37
Views: 1905

Re: Which Emulator for BBC Micro on Linux?

BitSeeker wrote:When I have time I might have a go at compiling the native Linux version again.
I did this on a freshly installed Debian quite recently, and I ended up needing to install the following prerequisite packages:

liballegro4-dev
libopenal-dev
libalut-dev
automake1.11

HTH
by Diminished
Thu Apr 05, 2018 5:59 am
Forum: software: classic games
Topic: Citadel Item Randomiser 0.4 (updated)
Replies: 42
Views: 4353

Re: Citadel Item Randomiser 0.4 (updated)

If you have .SSD files (disc images), which are how most BBC software is distributed these days, you can load them into jsbeeb (which is the in-browser emulator used by the games on bbcmicro.co.uk). The main jsbeeb site is here: https://bbc.godbolt.org/ If you click on Discs at the top, select "From...
by Diminished
Wed Apr 04, 2018 4:28 pm
Forum: software: classic games
Topic: Citadel Item Randomiser 0.4 (updated)
Replies: 42
Views: 4353

Re: Citadel Item Randomiser 0.4 (updated)

Hello, just stumbled upon this randomiser version. Is there a version with infinite lives? Completed this as a boy some 30 years or so ago and want my 8-year-old to have a go. The game is so damn hard to complete in one sitting when you're not used to keys. Thanks Currently there isn't, I'm afraid....
by Diminished
Sun Apr 01, 2018 4:35 pm
Forum: software: new games
Topic: Prince of Persia
Replies: 115
Views: 6069

Re: Prince of Persia

I think I have it. Every time you die and press enter to restart the level, the stack pointer starts 6 bytes lower than it did last time the level was loaded. Logic suggests this isn't a sustainable situation. You sir, are a star! I will investigate this finding later on and compare against the ori...
by Diminished
Sun Apr 01, 2018 4:12 pm
Forum: software: new games
Topic: Prince of Persia
Replies: 115
Views: 6069

Re: Prince of Persia

I think I have it. Every time you die and press enter to restart the level, the stack pointer starts 6 bytes lower than it did last time the level was loaded.

Logic suggests this isn't a sustainable situation.
by Diminished
Sun Apr 01, 2018 10:37 am
Forum: software: new games
Topic: Prince of Persia
Replies: 115
Views: 6069

Re: Prince of Persia

Ah, yes. I suppose it's because the tile hits the Prince. I have a bad habit of charging through these two "stone rain" rooms and trying to see if I can get past them without getting hit. Because the clock never stops. I had a look at the stack and it did seem like it suffered from the usual corrupt...
by Diminished
Sun Apr 01, 2018 8:36 am
Forum: software: new games
Topic: Prince of Persia
Replies: 115
Views: 6069

Re: Prince of Persia

OK! Four more playthroughs (on the test build this time), and it crashed on the final one. But I got the receipts! This is a b-em 2.2 savestate: popsavestate.zip Before I started, I had the sense to patch the emulator to allow me to save state from its debugger -- so I was able to dump the state rig...
by Diminished
Sun Apr 01, 2018 2:01 am
Forum: software: new games
Topic: Prince of Persia
Replies: 115
Views: 6069

Re: Prince of Persia

Did you use the save game system at all (CTRL-G) during your playthrough? No, I didn't. I've just found and fixed a definite memory scribble that was reported by David on the Princed forum. This was due to the fact that I missed an instance in which the original source used an overloaded label for ...
by Diminished
Sat Mar 31, 2018 4:21 pm
Forum: software: new games
Topic: Prince of Persia
Replies: 115
Views: 6069

Re: Prince of Persia

OK, I got another one. Unfortunately this was in Firefox again, but I'll probably do another few playthroughs on b-em to see if I can convince it to misbehave in that emulator. Hopefully I won't die twelve times on Level 8 next try. SPOILERS FOLLOW (if you care about that sort of thing in a three de...
by Diminished
Sat Mar 31, 2018 9:53 am
Forum: software: new games
Topic: Prince of Persia
Replies: 115
Views: 6069

Re: Prince of Persia

Glad you're enjoying the game. Thanks for digging in for the bug report. You must be very experienced at the game as I didn't think anyone would get anywhere close to completing it that quickly. I find it nails hard by modern standards hence adding the "easy guards" cheat for our less youthful refl...
by Diminished
Fri Mar 30, 2018 1:22 am
Forum: software: new games
Topic: Prince of Persia
Replies: 115
Views: 6069

Re: Prince of Persia

This is great. I know the PC version of this game very well, so I set out to try to complete it on my first try. The jump timing seems to differ very slightly from the PC version, although I'm almost certain this was a quirk of the PC port rather than a problem with this Master port. At first I also...
by Diminished
Thu Mar 22, 2018 6:34 pm
Forum: software: classic games
Topic: Citadel Item Randomiser 0.4 (updated)
Replies: 42
Views: 4353

Re: Citadel Item Randomiser 0.4 (updated)

Wow, great stuff. Citadel was one of my favourites. Breathes some new life into the old girl. Cool. I had fun writing it, although all the testing took the shine off of playing it for me, unfortunately. Still, I've never written any 6502 assembler before (which I learned by disassembling the game i...
by Diminished
Sat Mar 17, 2018 3:50 pm
Forum: hardware
Topic: IBM XT 360K (Double Density) Floppy on Model B?
Replies: 3
Views: 385

Re: IBM XT 360K (Double Density) Floppy on Model B?

Cool, thanks. I thought that I would run into problems since the drive is double density, but I suppose not (I never had a disc drive for my Beeb back in the 80s, so I'm new to this).

Is there a connector readily available for doing this, or am I going to have to try to hack one together?
by Diminished
Fri Mar 16, 2018 8:38 pm
Forum: hardware
Topic: IBM XT 360K (Double Density) Floppy on Model B?
Replies: 3
Views: 385

IBM XT 360K (Double Density) Floppy on Model B?

So I have an old IBM XT 5¼" floppy drive, and I'm wondering if it's possible to use it with a Model B, since I have a load of old PC 360K discs in the roof, with nothing particularly interesting on them.

The machine has DFS and an 8271. I suspect one needs a 1770?

Any ideas?
by Diminished
Fri Mar 09, 2018 6:54 pm
Forum: off-topic
Topic: Thermionic Valves
Replies: 63
Views: 3475

Re: Thermionic Valves

Thank you. Twenty years on, I finally get it. The reason I was confused is because solid state amps nowadays feature "tube emulation" circuits which are intended to mimic the sound of old valve amps (and, to be fair, they are pretty good nowadays). I'd assumed these circuits would introduce the same...
by Diminished
Fri Mar 09, 2018 2:14 pm
Forum: general
Topic: Maplin Electronics in administration
Replies: 110
Views: 6092

Re: Maplin Electronics in administration

I wonder if it is a bit like the goose that lays golden eggs. Imagine someone owns such a goose but it seems to be ailing and isn't laying so many golden eggs so he puts it up for sale. People look at the goose and one buyer concludes that it probably has a terminal illness but has a plan and buys ...
by Diminished
Thu Mar 08, 2018 5:18 pm
Forum: other vintage computer hardware, software and games
Topic: No more leaded solder
Replies: 51
Views: 2170

Re: No more leaded solder

Paradoxically, it seems like the chief effect of this ban on the denizens of this forum was ... a large uptick in sales of leaded solder. :lol:
by Diminished
Thu Mar 08, 2018 5:05 pm
Forum: off-topic
Topic: Thermionic Valves
Replies: 63
Views: 3475

Re: Thermionic Valves

Thanks a lot, guys. The question I was trying to ask here was "how close is too close?", which I now realise is about as sensible as asking how long a piece of string is, what with magnetic fields being infinite and all. I think I was hoping that someone would pat me on the head and tell me everythi...
by Diminished
Thu Mar 08, 2018 6:56 am
Forum: general
Topic: Maplin Electronics in administration
Replies: 110
Views: 6092

Re: Maplin Electronics in administration

Here's a look at what happened to Maplin from a very different angle. It seems they may have had problems with tangled finances as well as the ones visible to us as geeks. Its sole owner is MEL Bidco. MEL Bidco is a wholly-owned subsidiary of MEL Midco, which in turn is a wholly-owned subsidiary of...
by Diminished
Wed Mar 07, 2018 6:35 pm
Forum: off-topic
Topic: Thermionic Valves
Replies: 63
Views: 3475

Re: Thermionic Valves

I might as well ask this here and see if anyone has any ideas. Not Acorn or computing related, so apologies for that. So I have a guitar amplifier -- a Laney VC30 -- which according to some commentators has a design flaw afflicting some models. Essentially, some seem to think that the speaker is mou...