Search found 2670 matches

by RobC
Thu Sep 19, 2019 7:17 am
Forum: hardware
Topic: A3000 arm 3 processor upgrade
Replies: 3
Views: 111

Re: A3000 arm 3 processor upgrade

I've done it to one of mine. The hardest part is removing the ARM2 - you need to take care as the pads are easily lifted/damaged. I'd be wary of doing it if there's been any corrosion around the CPU. Once it's removed, fitting the new PLCC socket is pretty simple. I just removed the middle part of t...
by RobC
Wed Sep 18, 2019 6:14 pm
Forum: hardware
Topic: A4 Laptop - replacement electrolytic capacitors and CMOS battery
Replies: 5
Views: 111

Re: A4 Laptop - replacement electrolytic capacitors and CMOS battery

The schematics are in the technical drawings and the parts list is in the technical reference manual here . I'd definitely recap the board if you can but working on the A4 is a pain - I damaged the keyboard connectors on mine just by opening them up to remove the keyboard. Also, the conductive mater...
by RobC
Tue Sep 17, 2019 9:57 pm
Forum: programming
Topic: Hardware sideways scrolling in Beeb BASIC using VDU command?
Replies: 2
Views: 123

Re: Hardware sideways scrolling in Beeb BASIC using VDU command?

P.374 of the BBC Advanced User Guide gives an example of how to drive the 6845 for hardware scrolling. You can scroll 8 pixels a time in mode 0 & mode 4, 4 pixels a time in mode 1 & mode 5 and 2 pixels a time in mode 2 ( & mode 8 ). If you can do assembler, there's a discussion of the vertical ruptu...
by RobC
Tue Sep 17, 2019 7:44 pm
Forum: for sale / freebies
Topic: WANTED: Hegotron Grafpad II ROM
Replies: 6
Views: 138

Re: WANTED: Hegotron Grafpad II ROM

I have a Grafpad II and have an overlay although it was pretty crumpled when I got it so I'll have to dig it out and see what state it's in. I have various other overlays that I picked up with a bunch of stuff but think they may be for the concept keyboard. I'll double check. I can also burn an EPRO...
by RobC
Sun Sep 15, 2019 2:09 pm
Forum: hardware
Topic: A3000 Type 1 mouse problem
Replies: 5
Views: 122

Re: A3000 Type 1 mouse problem

Have you double checked the lead? They're the most common source of problems and I've sometimes found that the break in the lead only shows up when it's positioned in the case. If it's not the lead, I've had some success gently realigning the emitter and detector but be careful as the pins can be ve...
by RobC
Sun Sep 15, 2019 2:01 pm
Forum: wanted
Topic: Wanted: Atom key posts / ] key
Replies: 26
Views: 664

Re: Wanted: Atom key posts / ] key

Mine arrived yesterday - many thanks :)
by RobC
Thu Sep 05, 2019 8:07 pm
Forum: wanted
Topic: Wanted: Atom key posts / ] key
Replies: 26
Views: 664

Re: Wanted: Atom key posts / ] key

If there are any left, could I ask for one please? My iss. 4 Atom is missing a key post and the '+' key.

Happy to pay postage and give a donation etc.

Thanks,

Rob
by RobC
Thu Sep 05, 2019 7:48 pm
Forum: for sale / freebies
Topic: VideoNuLA boards
Replies: 96
Views: 15209

Re: VideoNuLA boards

I've played around with the tools in Altera but not really worked out a regime for optimisation beyond guess work and trial and error... Pretty much trial and error. When I've hit a limit in the past, I've just used educated guess work to figure out a way round it. More often than not, it's come do...
by RobC
Thu Sep 05, 2019 7:44 pm
Forum: software: new games
Topic: New version of Frogger (was: A demo of what is looking like a new Frogger for the beeb)
Replies: 195
Views: 29416

Re: New version of Frogger (was: A demo of what is looking like a new Frogger for the beeb)

Chuckie wrote:
Wed Sep 04, 2019 9:46 pm
I was wondering if you consider using the same technique to convert ghost and goblins arcade to beeb?
The CPC version will run on my Pi co-pro based emulator - it plays pretty well and shows what a M128 version might look like. It's still really hard though!
by RobC
Wed Sep 04, 2019 8:45 pm
Forum: hardware
Topic: Sega Light Phaser on a BBC Micro
Replies: 29
Views: 849

Re: Sega Light Phaser on a BBC Micro

Thanks so much for this Tricky. I bought a cheap Sega Light Phaser and now have it hooked up to my Beeb :D
by RobC
Wed Sep 04, 2019 6:49 pm
Forum: for sale / freebies
Topic: VideoNuLA boards
Replies: 96
Views: 15209

Re: VideoNuLA boards

No probs rob, you might be able to sneak something in to reset on a write to another register? It must be tight - you've done well to squeeze all the extras in as it is. I've maxed out the LABs but I think there are a few LEs left. I had to work really hard to fit the fix for the cursor in. I'll se...
by RobC
Wed Sep 04, 2019 5:49 pm
Forum: upcoming and recent events & exhibitions
Topic: London Show / Sat 26th October 2019
Replies: 2
Views: 251

Re: London Show / Sat 26th October 2019

I'd like a stand please. Not exactly sure what I'll be bringing/demonstrating but I'm going to use it as motivation to get on with finishing off Doom!
by RobC
Wed Sep 04, 2019 5:02 pm
Forum: for sale / freebies
Topic: VideoNuLA boards
Replies: 96
Views: 15209

Re: VideoNuLA boards

Is there any way to sync the FE23 toggle without resetting - I'm having problems with a demo I'm writing where spurious writes to FE23 (caused by VSYNC glitches in my DMA/Aeris thing) are making some funky but unwanted effects. Being able to re-sync occasionally would be a big help but I can't real...
by RobC
Sat Aug 24, 2019 11:25 am
Forum: hardware
Topic: crude Beeb PSU question
Replies: 11
Views: 377

Re: crude Beeb PSU question

Re the Turtles. I'm going to have one working on the Acorn weekend for people to try out with LOGO. The museum have 3 - all of which are at home with me at the moment. All 3 had corroded batteries which have been removed. I'm putting some new rechargeables in one of them.. which is a bit of a pain ...
by RobC
Sat Aug 24, 2019 8:12 am
Forum: hardware
Topic: crude Beeb PSU question
Replies: 11
Views: 377

Re: crude Beeb PSU question

It should work without any problems - my understanding is that the X2s are just there for mains filtering. What are you planning to do with the Valiant? I had a couple of them running at the Bristol RISC OS show earlier in the year via Acornsoft Logo. I can dig out my instructions/examples if it wou...
by RobC
Thu Aug 22, 2019 9:44 pm
Forum: hardware
Topic: BBC clock speed
Replies: 23
Views: 750

Re: BBC clock speed

That had me mildly confused for a second, so let me try... Sorry for any confusion Ed! I guess what I was trying to say was that each mode 0 pixel takes one cycle but the reason it looks like it takes two cycles in Julian's calculation is because half the screen is made up of border. Something else...
by RobC
Thu Aug 22, 2019 8:13 pm
Forum: upcoming and recent events & exhibitions
Topic: Cambridge Sept 2019 archiving thread
Replies: 35
Views: 957

Re: Cambridge Sept 2019 archiving thread

If at all possible, it would be great to archive the Bitstik multi-plotter driver as I don't think we have a copy of it anywhere.
by RobC
Tue Aug 20, 2019 8:34 pm
Forum: hardware
Topic: Sega Light Phaser on a BBC Micro
Replies: 29
Views: 849

Re: Sega Light Phaser on a BBC Micro?

I have a Beeb version of the Stack Light Rifle in need of repair. I also have the original cassette with game(s) for it somewhere. If you can post them, I'll give them a try. I've got the tape - it says it has three games on it (one is "High Noon", can't remember the other two). The rifle is in bit...
by RobC
Tue Aug 20, 2019 8:26 pm
Forum: software: other
Topic: Micronova Systems Limited PCB CAD
Replies: 2
Views: 195

Re: Micronova Systems Limited PCB CAD

Not that I'm aware of. It is listed on the Centre for Computing History site though. I had this program running on the 32016 second processor which allowed much bigger PCBs to be designed! Excellent! I'm assuming it was written in BBC BASIC then? Any serious 32016 software to add to the collection i...
by RobC
Tue Aug 20, 2019 8:20 pm
Forum: general
Topic: Wakefield RISC OS Computer Club talk/demo
Replies: 5
Views: 286

Re: Wakefield RISC OS Computer Club talk/demo

I'm down the road and go to the FWOTM meetings from time to time. I'd been thinking of doing a Beeb-ish presentation, but hadn't thought of anything that I could do with my portable Compact, or was worth dismantling my entire main system for two hours for. They were interested in the stuff I've don...
by RobC
Tue Aug 20, 2019 4:37 pm
Forum: general
Topic: Wakefield RISC OS Computer Club talk/demo
Replies: 5
Views: 286

Re: Wakefield RISC OS Computer Club talk/demo

helpful wrote:
Tue Aug 20, 2019 6:25 am
Are you any closer to London?
I'm based in Newport, South Wales so still a couple of hours away :(
by RobC
Mon Aug 19, 2019 4:40 pm
Forum: general
Topic: Wakefield RISC OS Computer Club talk/demo
Replies: 5
Views: 286

Wakefield RISC OS Computer Club talk/demo

I've been asked if I'd do a talk/demo on something Beeb-related at the Wakefield RISC OS Computer Club on Wednesday 4th September. Unfortunately, although I'd love to do it, I can't make it as I don't finish work until 5 and I'm over 3 hours from Wakefield. Is there anyone else on here who would be ...
by RobC
Sat Aug 17, 2019 12:26 pm
Forum: software
Topic: Acorn Archimedes LISP
Replies: 2
Views: 309

Re: Acorn Archimedes LISP

Unfortunately, I don't think so. I have the equivalent C, Fortran and ISO-Pascal packages but no Lisp.

However, it may be descended from the ARM Evaluation system Lisp which is here with the manual here.
by RobC
Thu Aug 15, 2019 6:30 pm
Forum: hardware
Topic: BBC clock speed
Replies: 23
Views: 750

Re: BBC clock speed

Obviously there is the implication that each pixel takes two cycles, but can anyone explain what’s happening (or if I’m completely off track here)? You're sort of on the right track but you've forgotten about the borders :) If you look at p. 361 of the Beeb Advanced User Guide, you'll see that regi...
by RobC
Tue Aug 13, 2019 9:38 pm
Forum: hardware
Topic: Sega Light Phaser on a BBC Micro
Replies: 29
Views: 849

Re: Sega Light Phaser on a BBC Micro?

kieranhj wrote:
Tue Aug 13, 2019 8:50 pm
If you make a lightgun for the Beeb I will write a game for it for sure. :D

(Although some kind soul will have to make me a lightgun to test it on.)
I have a Beeb version of the Stack Light Rifle in need of repair. I also have the original cassette with game(s) for it somewhere.
by RobC
Tue Aug 13, 2019 9:36 pm
Forum: hardware
Topic: what's the use of Mode 0
Replies: 24
Views: 913

Re: what's the use of Mode 0

I always assumed that it was for word processing and spreadsheets as the dot-matrix printers around at the time were 80-column. If you wanted your micro to be considered as a "serious" machine for business use, it had to be capable of producing an 80-column display. (c.f. this video by the 8-bit guy...
by RobC
Sun Aug 11, 2019 8:55 pm
Forum: archive requests
Topic: Superior's Sharpshooter package
Replies: 1
Views: 148

Re: Superior's Sharpshooter package

It looks very much like a copy/rebrand of the Stack Light Rifle. I have the Beeb version and it doesn't have the wooden butt that was found on earlier models so looks exactly like the image in the advert. Unfortunately, mine doesn't work - from memory, the photosensor has died. I keep meaning to get...
by RobC
Sun Aug 11, 2019 8:51 pm
Forum: hardware
Topic: BBC Micro: Truss Head Screws
Replies: 3
Views: 289

Re: BBC Micro: Truss Head Screws

Mark@Retroclinic will almost certainly have them but, if not, the part numbers are in this post.
by RobC
Fri Aug 09, 2019 11:42 am
Forum: hardware
Topic: Mystery card in BBC B from ebay
Replies: 9
Views: 396

Re: Mystery card in BBC B from ebay

Here are a couple more photos of the board. There are 5 wires, red and pink run to the 6502 socket, and orange, brown and yellow go to jumper 21. (Orange - top right, Brown - bottom right, yellow - bottom left) Jumper 21, top east-west looks a little messy as there's a Vine Reply installed on that ...
by RobC
Fri Aug 09, 2019 7:15 am
Forum: hardware
Topic: Pi Tubedirect
Replies: 41
Views: 1537

Re: Pi Tubedirect

map856 wrote:
Fri Aug 09, 2019 3:18 am
Just letting you know I managed a very quick test and glad to say success!!
Great news :D

I'll have a think about how we can get it to work with your old FLEX disks - it shouldn't be too difficult to come up with a mod that'll allow it to work.