Search found 323 matches

by VectorEyes
Fri Jul 10, 2020 12:56 pm
Forum: 8-bit acorn software: other
Topic: Trying to remember a rocket ship game with an asteroid field (educational game)
Replies: 2
Views: 80

Re: Trying to remember a rocket ship game with an asteroid field (educational game)

That sounds like one of the sub-games from Space Mission Mada by Sherston Software. I recognise it because I was playing it a few weeks ago!
by VectorEyes
Thu Jul 09, 2020 1:20 pm
Forum: 8-bit acorn hardware
Topic: Reasonable expectations for CUB monitor
Replies: 4
Views: 266

Re: Reasonable expectations for CUB monitor

Sorry, I must have missed this thread when you posted it. I think it’s very much pot luck. I’ve had a few that were fine, and others with a totally blank screen or a horizontal line in the middle. The problem with Cubs, as distinct from Beebs, is that there are fewer people who know how to diagnose ...
by VectorEyes
Thu Jul 09, 2020 1:29 am
Forum: programming
Topic: Self Modifying Code
Replies: 12
Views: 381

Re: Self Modifying Code

I even spotted a place where I got to it by falling through from a BCC that did not branch, meaning the carry would definitely be set ; so I just used ADC #&3F instead of CLC ; ADC #&40 like somebody who pegs their socks in pairs. I mean if you're going to get hanged for taking a lamb, you might as...
by VectorEyes
Thu Jul 09, 2020 12:30 am
Forum: 8-bit acorn software: classic games
Topic: Action games an average person can likely complete
Replies: 15
Views: 324

Re: Action games an average person can likely complete

I think I completed Storm Cycle on my second playthrough, but that says more about the easy nature of the game than about my game-playing prowess! Regarding Exile, it's really more of an action adventure... as such it's designed to let you save the state, reload, think about the puzzles, try things,...
by VectorEyes
Wed Jul 08, 2020 8:27 pm
Forum: 8-bit acorn hardware
Topic: BBC Master BIOS
Replies: 5
Views: 188

Re: BBC Master BIOS

BBC Masters don’t really have a BIOS, they’re not PCs! They have an OS in ROM. To help us to help you it would be good if you could tell us what model you have and say what appears on screen when you turn it on.
by VectorEyes
Tue Jul 07, 2020 10:13 pm
Forum: programming
Topic: Self Modifying Code
Replies: 12
Views: 381

Re: Self Modifying Code

Personally, I use SMC all over the place where it will save space or cycles! But only if I *need* to save the space or the cycles!
by VectorEyes
Tue Jul 07, 2020 3:36 pm
Forum: acorn & bbc micro user group (abug) events
Topic: All-day 'Virtual' Acorn session #5, Saturday 4th July 2020, 9am - 10pm
Replies: 63
Views: 2232

Re: All-day 'Virtual' Acorn session #5, Saturday 4th July 2020, 9am - 10pm

Really looking forward to watching these! I need to move to a country where it's the middle of the night when they're happening, so I can get up and participate in realtime. But for the moment, watching on catch-up will have to do. Thanks for uploading them so quickly.
by VectorEyes
Tue Jul 07, 2020 12:22 pm
Forum: for sale / freebies
Topic: FS: USB "POST box" adaptors (for debugging Archimedes / Risc PC systems that don't boot)
Replies: 35
Views: 901

Re: FS: USB "POST box" adaptors (for debugging Archimedes / Risc PC systems that don't boot)

Given that I have about 5 RiscPCs and a variety of other machines that could do with some fixing ... at some point in the future ... please could I be added to the queue?

Thanks!
by VectorEyes
Mon Jul 06, 2020 7:15 pm
Forum: new ideas wishlist & general chat
Topic: what should i write next?
Replies: 256
Views: 25401

Re: what should i write next?

It still only has a 1MHz CRTC though... :)
by VectorEyes
Tue Jun 30, 2020 6:26 pm
Forum: 8-bit acorn hardware
Topic: THE MASTER 128 OF THE FRENCH FROGGER !
Replies: 62
Views: 1298

Re: THE MASTER 128 OF THE FRENCH FROGGER !

Can you see any batteries in there at all? There should be some in there, they keep the cmos battery settings and the real-time clock working. If your Master is consistently working, then they must be in there somewhere!
by VectorEyes
Tue Jun 30, 2020 6:02 pm
Forum: 8-bit acorn hardware
Topic: THE MASTER 128 OF THE FRENCH FROGGER !
Replies: 62
Views: 1298

Re: THE MASTER 128 OF THE FRENCH FROGGER !

That’s a nice Master 128. Congratulations!
by VectorEyes
Wed Jun 24, 2020 11:37 pm
Forum: general
Topic: Retro Asylum - Exile
Replies: 3
Views: 180

Re: Retro Asylum - Exile

Everybody go and vote for Exile! Why would you want to hear about some old skateboarding game? Exile is clearly the superior choice!
by VectorEyes
Tue Jun 23, 2020 10:06 pm
Forum: general
Topic: Apple goes ARM
Replies: 31
Views: 1161

Re: Apple goes ARM

Not one mention of Acorn in the BBC article about this. :( How long before Apple's marketing engines start claiming these are the first ARM-powered desktop computers? If they do, well, Advertising Standards will be getting an email from me. Pretty unlikely I think, they haven't mentioned ARM once p...
by VectorEyes
Sun Jun 21, 2020 12:40 am
Forum: new projects and releases: demoscene
Topic: New demo: 'Evil Influences' for the BBC Master
Replies: 7
Views: 317

New demo: 'Evil Influences' for the BBC Master

Bitshifters and Desire are proud to release 'Evil Influences' for the BBC Master. https://bitshifters.github.io/posts/prods/bs-evil-influences.html This one has been in development for many months and contains graphical techniques not previously seen on the Beeb (as far as I am aware!) It was a join...
by VectorEyes
Mon Jun 15, 2020 1:33 am
Forum: new projects and releases: demoscene
Topic: DEMOSCENE TOP DEMO
Replies: 9
Views: 400

Re: DEMOSCENE TOP DEMO

You'll need a BBC Master to run most of the recent demos!

Also, in around a week's time there'll be another one to add to the list... assuming I don't collapse from lack of sleep before Saturday!
by VectorEyes
Fri May 29, 2020 3:12 pm
Forum: 8-bit acorn emulators
Topic: b2 - new emulator
Replies: 136
Views: 15545

Re: b2 - new emulator

Not sure. I can compile the latest master branch from source and run both Release and Debug versions locally, which would suggest it's some problem with packaging / code-signing / notarisation of some kind, or perhaps libraries that are available on my machine that aren't on yours. Will try to see i...
by VectorEyes
Fri May 29, 2020 10:50 am
Forum: 8-bit acorn emulators
Topic: b2 - new emulator
Replies: 136
Views: 15545

Re: b2 - new emulator

Hi @LordVaderUK ... quick question: Where are you running B2 from? Do you run it from the Downloads folder or do you copy it to Applications? If you're downloading it straight to the Downloads folder and running it directly from there, it might be worthwhile copying it to the Applications folder and...
by VectorEyes
Fri May 29, 2020 12:26 am
Forum: 8-bit acorn emulators
Topic: b2 - new emulator
Replies: 136
Views: 15545

Re: b2 - new emulator

How confident do you feel building from source? I have recently been building B2 from source on macOS Catalina and although it requires a bit of command-line effort, it's really not that bad. If you're interested in giving it a go you could take a look at the instructions (https://github.com/tom-sed...
by VectorEyes
Thu May 28, 2020 12:22 am
Forum: new projects and releases: demoscene
Topic: NOVA Online Invite - a new Bitshifters demo for the BBC Master
Replies: 10
Views: 541

Re: NOVA Online Invite - a new Bitshifters demo for the BBC Master

Awesome demo Kieran and everyone else who contributed! There is definitely some history behind the fire alarm thing. :D At Nova 2019 the alarm went off at the end of the Friday evening, owing to the amount of smoke from the smoke machines. Some poor soul had to get up at almost midnight and come dow...
by VectorEyes
Wed May 27, 2020 5:56 pm
Forum: programming
Topic: Incrementing a 2-byte number
Replies: 14
Views: 572

Re: Incrementing a 2-byte number

Now try doing this when the preceding and following code is writing to the CRTC registers, which are 1MHz, so you have to take account of whether each CPU cycle is on an even or odd 1MHz tick and adjust the timings for STA <register> accordingly because of cycle-stretching... :D
by VectorEyes
Wed May 27, 2020 12:18 pm
Forum: programming
Topic: Incrementing a 2-byte number
Replies: 14
Views: 572

Re: Incrementing a 2-byte number

This is a great example of the various trade-offs you have to make when optimising code for space vs. speed, but there are other considerations as well: side-effects (or lack thereof) and cycle timing predictability. INC &70 BNE skiphigh INC &71 .skiphigh Takes: Either 8 or 12 cycles. (No good if yo...
by VectorEyes
Mon May 25, 2020 2:32 am
Forum: 8-bit acorn hardware
Topic: Trouble with Sideways RAM on Master 128
Replies: 21
Views: 390

Re: Trouble with Sideways RAM on Master 128

Could this be related to Smart SPI and use of the User Port for file loading? A while ago I gave UPURSFS a try to see whether I could use it to host files on my development machine (an iMac) and load them directly from the iMac. But I could never get Wave Runner to load because it crashed out toward...
by VectorEyes
Sun May 24, 2020 7:13 pm
Forum: programming
Topic: Shadow RAM question
Replies: 11
Views: 396

Re: Shadow RAM question

Thanks all. I suppose as long as my code lives and is accessing data only in sideways RAM, it shouldn't be a problem. Should be fine. The only things to watch out for when you have code and data in SWR is that 1. you keep track of which SWR bank is paged in (low four bits of ROMSEL, &FE30), and 2. ...
by VectorEyes
Sun May 24, 2020 6:07 pm
Forum: programming
Topic: Shadow RAM question
Replies: 11
Views: 396

Re: Shadow RAM question

Thanks all. I suppose as long as my code lives and is accessing data only in sideways RAM, it shouldn't be a problem. Should be fine. The only things to watch out for when you have code and data in SWR is that 1. you keep track of which SWR bank is paged in (low four bits of ROMSEL, &FE30), and 2. ...
by VectorEyes
Thu May 14, 2020 9:20 am
Forum: for sale / freebies
Topic: Wide variety of Acorn / RO hardware, software, and other artefacts
Replies: 19
Views: 1505

Re: Wide variety of Acorn / RO hardware, software, and other artefacts

Just noticed the Phoebe RISC PC II case with an asking price of £25. I'm definitely interested in that! Will pop a note in the email thread when I reply, so we don't lose track :) Oh dear, we've now had I think seven people say the same thing. I forget what the hold-up is on person 1 -- possible it...
by VectorEyes
Mon May 11, 2020 10:55 am
Forum: 32-bit acorn software: other
Topic: Shredding free space of hard drives
Replies: 13
Views: 541

Re: Shredding free space of hard drives

The obvious cheap-and-cheerful way to do it, to me, would be to have a few large-ish files filled with random data. Delete all the personal data, then fill up the free space with the random files. Then delete them and fill it up with some other random files. Repeat two or three times and it would be...
by VectorEyes
Mon May 11, 2020 1:14 am
Forum: 8-bit acorn software: other
Topic: Displaying photos in VideoNuLA attribute mode 1 (240x256, 16 colours)
Replies: 38
Views: 1652

Re: Displaying photos in VideoNuLA attribute mode 1 (240x256, 16 colours)

One question now though - does the stable raster technique work on b-em? If I do ever play around with this I'd be using an emulator and b-em is my emulator of choice most of the time. Unfortunately I think you'll need B2 or JSBeeb for accurate stable raster emulation. I recall moving from B-Em to ...
by VectorEyes
Mon May 11, 2020 12:45 am
Forum: 8-bit acorn software: other
Topic: Displaying photos in VideoNuLA attribute mode 1 (240x256, 16 colours)
Replies: 38
Views: 1652

Re: Displaying photos in VideoNuLA attribute mode 1 (240x256, 16 colours)

Yes, a Z3 theorem solver. Whatever that is. :) Regarding stable raster to squeeze in an additional palette change... you've got 48 cycles in the vertical blank. If you assume that every palette write is LDA immediate, STA palette register, you can fit in maximum 8 writes... But if you had A, X and Y...
by VectorEyes
Thu Apr 30, 2020 5:27 pm
Forum: programming
Topic: Disable screen update
Replies: 12
Views: 352

Re: Disable screen update

(Ignore, I hadn't fully understood your requirements!)
by VectorEyes
Thu Apr 30, 2020 2:23 pm
Forum: programming
Topic: Disable screen update
Replies: 12
Views: 352

Re: Disable screen update

Well, you could set all palette entries to black!

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