Search found 401 matches

by VectorEyes
Thu Feb 18, 2021 1:32 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

I’m glad to have helped in a small way to get Kenton a copy. (Specifically, having a UK postal address and agreeing to forward it!) In an amusing twist, literally a few days after I finally got round to posting it, I was rummaging through a box looking for a network adapter when I found another copy...
by VectorEyes
Wed Feb 17, 2021 10:39 am
Forum: 32-bit acorn software: classic games
Topic: DRIFTER bad disk , JDF copy needed! Help
Replies: 3
Views: 177

Re: DRIFTER bad disk , JDF copy needed! Help

For what it's worth, I feel your pain. Same thing happened to me with a 5.25" disc when I was trying to archive some old Acornsoft titles.

And then I buggered up the drive by (I think) nudging the heads when I was trying to clean them... :(
by VectorEyes
Mon Feb 15, 2021 10:42 pm
Forum: programming
Topic: Reverse engineering copy protection code
Replies: 9
Views: 392

Re: Reverse engineering copy protection code

I don’t think discussing copy-protected code from several decades ago is going to be a problem! I wouldn’t worry about it, really.
by VectorEyes
Mon Feb 15, 2021 12:11 pm
Forum: new ideas wishlist & general chat
Topic: Why was dizzy series not on the Beeb
Replies: 20
Views: 595

Re: Why was dizzy series not on the Beeb

I don't think Codemasters did many games at all for the BBC Micro, possibly because they just started out doing C64 / Spectrum stuff, or more likely because they looked at the commercial side and decided it wasn't worth it. I'm sure they absolutely could have been ported to the Beeb, although fittin...
by VectorEyes
Mon Feb 15, 2021 12:06 pm
Forum: programming
Topic: Add if less than (6502)
Replies: 15
Views: 396

Re: Add if less than (6502)

For these sorts of questions it's quite helpful to give a bit of context explaining why you want to do this? How will the resulting value be used, what possible values could it start with, what is the maximum and minimum you might want to count up to, etc. With more context, people may be able to co...
by VectorEyes
Sat Feb 13, 2021 11:31 am
Forum: 8-bit acorn hardware
Topic: Forty years ago...
Replies: 77
Views: 2309

Re: Forty years ago...

It’s indeed widely acknowledged that the Microsoft’s exclusivity on the IBM PC Operating System handed them a golden opportunity to sew up the PC market. I recall a line I read many years ago in an article discussing it, something like “Once IBM gave Microsoft the exclusive contract, all they had to...
by VectorEyes
Fri Feb 12, 2021 11:12 am
Forum: 8-bit acorn software: classic games
Topic: Perplexity variant (uncompleteable game!) and a puzzle / challenge
Replies: 2
Views: 195

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

Well, two possibilities spring to mind: 1. The fix was developed and tested on a Master, and there were instructions that stated "You must be in a screen mode that's using shadow screen memory before you do this!" but that bit was cut from the column for space / layout reasons. 2. Original...
by VectorEyes
Fri Feb 12, 2021 10:46 am
Forum: 8-bit acorn software: classic games
Topic: Perplexity variant (uncompleteable game!) and a puzzle / challenge
Replies: 2
Views: 195

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

Just looking at that description in Hacman's column, it struck me that the 'RUN' after the line that saves the altered file back to disc was a bit odd. Surely that's a typo? Edit: Actually it's even worse ... it's poking a value into screen memory, then saving everything from &1100 to &8000 ...
by VectorEyes
Tue Feb 09, 2021 12:32 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2948
Views: 386530

Re: Worth Taking a Look At

To be fair, I've just asked the seller on FaceBook and he said that the Electrons did all have motherboards inside.
by VectorEyes
Tue Feb 09, 2021 11:54 am
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2948
Views: 386530

Re: Worth Taking a Look At

There was a picture that showed an awful lot of Electron motherboards in a box. This would suggest that *maybe* they've been removed from all those cases!
by VectorEyes
Tue Feb 09, 2021 10:32 am
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2948
Views: 386530

Re: Worth Taking a Look At

It's also worth noting that then 'keyboards' might be empty shells with no motherboard inside.
by VectorEyes
Mon Feb 08, 2021 12:00 pm
Forum: new projects and releases: demoscene
Topic: The well known Bad Apple demo on the Acorn Electron
Replies: 24
Views: 2687

Re: The well known Bad Apple demo on the Acorn Electron

There are always people who’ll look at retro demo videos on YouTube and post comments questioning whether it was really done on original / unexpanded hardware. (Sigh)...
by VectorEyes
Sun Feb 07, 2021 11:23 pm
Forum: 8-bit acorn software: other
Topic: Enhanced mode 1 pictures
Replies: 115
Views: 21800

Re: Enhanced mode 1 pictures

I know my Mk.1 eyes and brain are doing a lot of work to fill in missing detail (blurring your vision makes them even better), so I'm wondering if it would be possible to use some eye-brain hacks/optical illusions to fool it even further when viewed on hardware? I'm thinking of things like the lila...
by VectorEyes
Sat Jan 30, 2021 1:20 pm
Forum: 8-bit acorn hardware
Topic: SAA5050 Reverse Engineering
Replies: 51
Views: 2381

Re: SAA5050 Reverse Engineering

That's the chip! (Although it's worth noting that there are at least three known variants found in BBC Micros and Masters, by Hitachi (the one above), Toshiba, and VLSI. The VLSI ones behave differently to the other two and although so far the Toshiba and Hitachi seem to be behave identically, it wo...
by VectorEyes
Fri Jan 22, 2021 1:44 pm
Forum: off-topic
Topic: LOLPRICE
Replies: 3075
Views: 389399

Re: LOLPRICE

I was discussing this with a few friends last week. Our conclusion was that it’s either people colluding to drive prices up, or some kind of low-level money laundering or other dodgy practise. If you look at the two top bidders, you don’t get to find out who they are, but you can see their feedback ...
by VectorEyes
Sun Dec 27, 2020 1:31 am
Forum: 8-bit acorn software: classic games
Topic: BBC Elite source, now fully documented and explained
Replies: 84
Views: 5939

Re: BBC Elite source, now fully documented and explained

Interesting. Back in the Day, I had a BBC Micro that had lots of modifications. Replay installed, a ROM/RAM board of some description, a dual 1770 and 8271 disc interface, etc. I think every game (including Elite and Exile) ran on it fine ... except Stryker's run. I didn't even know there was anythi...
by VectorEyes
Thu Dec 17, 2020 9:48 am
Forum: development tools
Topic: BeebAsm
Replies: 131
Views: 18642

Re: BeebAsm

I need a little help getting Beebasm to build Starquake from source... Starquake is basically one big file that contains 1 large chunk and 3 small chunks, all concatenated together. This big file loads from disc at &1200 and the large chunk is immediately relocated to &E00, while the 3 smal...
by VectorEyes
Tue Dec 01, 2020 12:01 am
Forum: 8-bit acorn software: classic games
Topic: Exile SD2BBC help
Replies: 4
Views: 439

Re: Exile SD2BBC help

Excellent to hear that you'll be playing it. One thing to mention: I have seen Youtubers in the past attempt to play Exile, and give up after jetting around using a joystick for 20 minutes, shooting at a few things, but never really doing the things you're meant to do to make progress. So, as a plea...
by VectorEyes
Fri Nov 27, 2020 11:06 am
Forum: introduce yourself
Topic: Hello World
Replies: 10
Views: 376

Re: Hello World

Welcome! I heartily recommend the whole "picking up 6502 as an escape from the day job" thing! There are so many resources out there to answer any questions you might have. I can't imagine what it must have been like to develop complicated/difficult techniques 'back in the day' with no int...
by VectorEyes
Fri Nov 27, 2020 10:41 am
Forum: 8-bit acorn hardware
Topic: Posting a 5.25” disc drive
Replies: 6
Views: 252

Re: Posting a 5.25” disc drive

Having bought drives from <popular auction site> in the past, only to have them damaged even when wrapped in bubble-wrap, I think if you really want to protect the drive, it can help to use a surrounding layer of those expanded polystyrene blobs (I've just realised I don't know the official term for...
by VectorEyes
Mon Nov 23, 2020 12:36 am
Forum: 8-bit acorn software: games - high scores
Topic: Frak! - PC style for testing (Private invite to regular HSC competitors only)
Replies: 235
Views: 8032

Re: Frak! - PC style for testing (Private invite to regular HSC competitors only)

Just to clarify: Do you need the email address associated with the Steam account, or the Steam account name?

Thanks!
by VectorEyes
Sat Nov 14, 2020 11:50 am
Forum: 8-bit acorn software: classic games
Topic: Electron Exile 'Helper'
Replies: 28
Views: 1387

Re: Electron Exile 'Helper'

Certainly looks like the other crew members are featured! This video confirms it.

https://youtu.be/MBVlzXshOw4
by VectorEyes
Fri Nov 13, 2020 11:29 pm
Forum: 8-bit acorn software: classic games
Topic: Electron Exile 'Helper'
Replies: 28
Views: 1387

Re: Electron Exile 'Helper'

I think you’ll have difficulty doing this on the Beeb version. For one thing it uses pretty much every last byte of memory, and more importantly it does hardware scrolling both horizontally and vertically, so whenever the screen scrolled you’d have to redraw the entirety of the helper area, which wo...
by VectorEyes
Fri Oct 23, 2020 2:30 pm
Forum: 8-bit acorn software: games - high scores
Topic: High Score Challenge S14 - R07 - Arkanoid
Replies: 65
Views: 3578

Re: High Score Challenge S14 - R07 - Arkanoid

It's been about a month since this challenge finished, but I just wanted to post this:

Screenshot 2020-10-23 at 14.27.40.png

LOOK AT THAT SCORE! WAVE 10, YEEHAH!
by VectorEyes
Sat Oct 17, 2020 10:00 am
Forum: past acorn preservation team sessions
Topic: Acorn Preservation Team meeting #2, Sunday 18th October 2020, 6:00pm - 9:00pm
Replies: 19
Views: 1241

Re: Acorn Preservation Team meeting #2, Sunday 18th October 2020, 6:00pm - 9:00pm

Would like to join this but family may have to take priority this time. If I can get the time away I will post again to request the meeting details. In any event, I suspect my time may be better served right now by trying to sort out the boxes and boxes of software and manuals I’ve got, and fix my d...
by VectorEyes
Wed Oct 14, 2020 10:22 am
Forum: programming
Topic: [SOLVED] Noob question about sound on Beeb
Replies: 9
Views: 551

Re: Noob question about sound on Beeb

Quick reply: I believe you have to keep the sound chip write active for at least 8us, which is longer than you've got it active in that code. EDIT: Was going to add an additional sentence to say "I know you're tried a delay, but have you made sure it's 8us" ... but you replied in the meant...
by VectorEyes
Sun Oct 11, 2020 5:20 pm
Forum: 8-bit acorn hardware
Topic: Master PSU recap
Replies: 7
Views: 382

Re: Master PSU recap

That grommet is a total pain. There are apparently tools that you can use to get it out and in again, but I generally go at it with a pair of pliers and work two small screwdriver blades into the gap between the wider ‘lip’ and the metal case, then lever it out. I’ve often found that it’s the imposs...
by VectorEyes
Thu Oct 08, 2020 1:10 am
Forum: 8-bit acorn software: other
Topic: Simple demo for SHADOW screen modes?
Replies: 21
Views: 1004

Re: Simple demo for SHADOW screen modes?

edit: deleted this post as I realised it didn’t actually help with the question being asked!
by VectorEyes
Fri Oct 02, 2020 12:48 am
Forum: programming
Topic: Attempting to use Shadow RAM with SIdeways RAM
Replies: 7
Views: 575

Re: Attempting to use Shadow RAM with SIdeways RAM

When your sprite plotting / reading code is running, do you have interrupts enabled or disabled? If you are writing directly to ROMSEL and ACCCON, instead of using the OS-approved routines to control whether shadow or main RAM is CPU-visible and/or is displayed and which SWR bank is active, then the...

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