8-bit acorn hardware • Re: Fault finding index
Continuing on from the BBC Issue 3 Model B... the repeating keys and other weirdness was caused by IC32 (74LS259) being flaky. However, my blind-typed program I do for keyboard testing didn't work...
View Article8-bit acorn hardware • Re: Issue 7 wont boot - now stuck for ideas
What does the memory test screen look like with the diagonal lines? Looking through my fixes for TTXVDU corruption, it is worth checking IC38 (74LS86) and IC15 (74LS273) it is also a good idea to...
View Article8-bit acorn hardware • Re: Why it is best to take it apart and NOT turn it on..
Just purge every last battery you can. My experience is mostly in arcade PCB repair, so a similar vintage.AAs will leak, especially Duracell which are the work of the devil - responsible for numerous...
View Articleeconet in all its guises • Some reference material for building Econets
Here are some links to reference material used in the Econet workshop session yesterday that may be of use to people.Acorn - Econet Installation Guide 1984 - https://chrisacorns.computinghistory.or...
View Articlegeneral • Re: Beeb Spotting
I noticed this in the paper...Was this by any chance an April fools joke?I ask because there have been beebs found used in some very serious applications over the last few years.Statistics: Posted by...
View Article32-bit acorn hardware • Re: Replacement A3000 motherboards
I’m planning to build one of these boards later this year.I’ve taken a very quick look at the document - it’s going to be very useful - I’m keen to follow a step by step process. Great...
View Articleeconet in all its guises • Re: Some reference material for building Econets
the Econet workshop session yesterday Ooh where/what was that?Statistics: Posted by IanJeffray — Wed Apr 02, 2025 7:26 pm
View Article8-bit acorn software: games - high scores • Re: High Score Challenge...
And the nominees are...Manic Miner 2021 https://www.bbcmicro.co.uk/game.php?id=3562Night Ninja https://www.bbcmicro.co.uk/game.php?id=4137Qwak 2024 Update...
View Article8-bit acorn software: other • Correct way to read ROM Version number on the...
What is the correct way to read a version number of a ROM on a tube ?Options as I see it 1) Upload some code to the IO processor to read the roms2) Do *help rom and then transfer the screen to the...
View Article8-bit acorn software: other • Re: Correct way to read ROM Version number on...
Feels to me like (1) would be best.(2) would be difficult, because the screen could be shadow, could be any mode, might even have a text area defined - unless perhaps, this is always immediately...
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8-bit acorn hardware • Re: Issue 7 wont boot - now stuck for ideas
That’s really useful, thanks We’d certainly tried the minimum config setup earlier in the debug process when we were swapping chips between broken and working machine but yes it makes sense to go back...
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32-bit acorn hardware • Re: A3000 repair - any help would be much appreciated
Ic28-31 can all get killed by battery leakage IME.If you’re sure all continuity to IC28 is good, it’s a reasonable bet. If you have a scope or thermal camera you could get more of an idea if it’s a...
View Articleprogramming • Re: How are FORTRESS plane/shadow sprites rendered in MODE 7
Level7 did a full disassembly of Fortress which contains many technical details about the screen and sprite drawing code: https://www.level7.org.uk/miscellany/fo ... sembly.txtStatistics: Posted by...
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acorn & bbc micro user group (abug) events • Re: [FULLY BOOKED] BOOKING...
Hey everyone. Just 24 hours (and a bit) until the most hyped event of the year, aka ABUG South April 2025, is open for business. I'd like to make a call out for a lanyard amnesty - I'm sure many of...
View Article32-bit acorn hardware • Re: Acorn mouse repairs
I've also seen the juddering on mice when either the 74LS14 is dead, or the LED isn't properly aligned.Put X1 and X2 (outputs from the LS14) on a scope and spin the respective axis encoder. You should...
View Articleoff-topic • Re: AliExpress . . . New and Original . . . Buyer Beware . . . !
I've not tried TEMU, I think large discounts result in forking out more in the long run.With Aliexpress complaints, contacting the seller via messaging prior to making the complaint can be...
View Articleeconet in all its guises • Re: Some reference material for building Econets
Ian has a point. Sorry Ian. We announced it in the preceding ABUG Zoom meeting three weeks ago, several times over the course of the meeting, to who we thought our primary audience would be. This is...
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8-bit acorn hardware • BBC Micro repair video at ABUG South April 6th
Hello all,A friend for Portugal sent me a BBC micro with a 6502 card inside to test and repair (if required). This is my first BBC Micro so I was thinking I could take it with me at ABUG South on...
View Article8-bit acorn hardware • Re: BBC Micro repair video at ABUG South April 6th
First question would have to be when was it last powered?You miy find the rifa problem on power up.Then unplug the co-pro card and try.You'll need a meter, and probably an oscilloscope if there's no...
View Article8-bit acorn software: games - high scores • Re: High Score Challenge - S24 -...
A little further, well same level but a few extra points...Score: 69940CrazyPainter_2025.pngStatistics: Posted by FourthStone — Sat Apr 05, 2025 4:40 am
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