Search found 2555 matches

by RobC
Thu Apr 18, 2019 5:57 pm
Forum: hardware
Topic: Some help needed to setup hdd on rpc600/4.02
Replies: 2
Views: 47

Re: Some help needed to setup hdd on rpc600/4.02

If you haven't done so already, check that the motherboard battery hasn't leaked. If the original battery is still in place, it's a good idea to replace it - something like this works well. I'd then check that the hard drive and CD-ROM drive are being recognised. I think you press F12 at the desktop...
by RobC
Wed Apr 17, 2019 6:29 pm
Forum: wanted
Topic: Battery replacement A3010
Replies: 13
Views: 103

Re: Battery replacement A3010

I'm happy to do it for you at Wakefield. I should have a spare AAA battery holder but you'll need to source the battery.
by RobC
Wed Apr 17, 2019 6:23 pm
Forum: other vintage computer hardware, software and games
Topic: YOUR COMPUTER's BBC MICRO REVIEW and the hateful days of type-in listings (VIC20 edition)
Replies: 14
Views: 301

Re: YOUR COMPUTER's BBC MICRO REVIEW and the hateful days of type-in listings (VIC20 edition)

Yeah - it's a bit of a minefield! I think the 68000 might have kicked it all off but don't know the history well enough.

I tend to think of things like the ARM as truly 32-bit and the NS32016 and 68000 as 16-bit but it's all a bit fuzzy :)
by RobC
Wed Apr 17, 2019 5:40 pm
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 63
Views: 2240

Re: Raspberry Pi to 1MHz bus interface

Mine arrived today too - many thanks. Looks like all the diodes point the same way? I've not built mine yet but the PDF that was posted earlier in the thread shows how the components should be placed. All the diodes appear to go the same way with the cathodes (black line end) connected to the square...
by RobC
Wed Apr 17, 2019 3:55 pm
Forum: other vintage computer hardware, software and games
Topic: YOUR COMPUTER's BBC MICRO REVIEW and the hateful days of type-in listings (VIC20 edition)
Replies: 14
Views: 301

Re: YOUR COMPUTER's BBC MICRO REVIEW and the hateful days of type-in listings (VIC20 edition)

BigEd wrote:
Wed Apr 17, 2019 3:30 pm
I notice the 16032 (later renamed the 32016) was described as a 16 bit chip:
Yes - I think the renaming to the 32016 came about later because manufacturers started calling CPUs with 32-bit registers "32-bit" even when they only had 16-bit data buses.
by RobC
Wed Apr 17, 2019 2:27 pm
Forum: other vintage computer hardware, software and games
Topic: YOUR COMPUTER's BBC MICRO REVIEW and the hateful days of type-in listings (VIC20 edition)
Replies: 14
Views: 301

Re: YOUR COMPUTER's BBC MICRO REVIEW and the hateful days of type-in listings (VIC20 edition)

February '83 carries a rather fence-sitting letter on whether to buy a BBC or a Commodore 64. I'd venture that because the machines were in their opening months, not enough utilities were out to fully exploit unique capabilities. The "horses for courses" response seems pretty sensible to me irrespe...
by RobC
Mon Apr 15, 2019 9:13 pm
Forum: hardware
Topic: RiscPC600 sliding cover mechanism?
Replies: 8
Views: 138

Re: RiscPC600 sliding cover mechanism?

To be honest, I've just made a small hole behind the gap and hooked the spring through there but that was the first one that came to hand. I've used pliers to bend the eye over the rectangular cut-out once it's screwed in place to ensure that the anchor point is roughly where it should be. Haven't ...
by RobC
Mon Apr 15, 2019 5:49 pm
Forum: other vintage computer hardware, software and games
Topic: Those Spectrum nerds, eh?
Replies: 26
Views: 454

Re: Those Spectrum nerds, eh?

My experience with Sinclair machines pretty much matches Mark's description. The first ZX81 I encountered was one my uncle had built from kit form. This would have been a very early model as he placed an order early on. It took three attempts for Sinclair to supply him with a working ULA. My own ZX8...
by RobC
Mon Apr 15, 2019 5:31 pm
Forum: hardware
Topic: RiscPC600 sliding cover mechanism?
Replies: 8
Views: 138

Re: RiscPC600 sliding cover mechanism?

I've repaired a few of my RiscPCs with this issue. I drill a small pilot hole at the back of the panel (just behind the rectangular cut-out) and use screw-in eyes like this: https://encrypted-tbn3.gstatic.com/shopping?q=tbn:ANd9GcRuM_49p7fKRa6p9NLs7nWh3oBb4FfEvmHe0uAZQXeu6o1FK36Qn-aPqBRTBGoRLm0zRDcO...
by RobC
Sun Apr 14, 2019 5:49 pm
Forum: off-topic
Topic: Blinged up BBCs
Replies: 17
Views: 433

Re: Blinged up BBCs

Slightly off topic and it has come up on here before but this Beeb has to be the most blinged-up micro of all time!
by RobC
Sun Apr 14, 2019 11:50 am
Forum: other vintage computer hardware, software and games
Topic: Those Spectrum nerds, eh?
Replies: 26
Views: 454

Re: Those Spectrum nerds, eh?

I used to work with lots of ham radio guys and loads of them were into this sort of stuff. There were even a few Beebs in work that had either been bought or brought in because the guys were so used to coding for them. I remember a Compact still being used in the early 2000s (although I'm not sure w...
by RobC
Sat Apr 13, 2019 7:16 pm
Forum: off-topic
Topic: What a waste
Replies: 5
Views: 212

Re: What a waste

That is a shame.

Our local "recycling depot" usually picks out anything that might be valuable and sells them at a shop on site. I think they've even sold some old computers on eBay at various times in the past.
by RobC
Thu Apr 11, 2019 7:39 pm
Forum: hardware
Topic: My New BBC Master
Replies: 17
Views: 390

Re: My New BBC Master

SpaceFlightOrange wrote:
Wed Apr 10, 2019 10:41 pm
Thanks for the detailed description, Rob. Really appreciated. If I haven’t plucked up the courage by the end of the month, i’ll Bring it to the Wakefield show for you to do :lol:
By all means do - I'm sure that between us, Daniel and I can get it sorted.
by RobC
Thu Apr 11, 2019 3:30 pm
Forum: programming
Topic: 6502 LDA / LDX / LDY and Zero flag
Replies: 8
Views: 247

Re: 6502 LDA / LDX / LDY and Zero flag

The BBC Advanced user guide is great for this kind of stuff. Chapter 6 covers the 6502 instruction set and, for each instruction, it lists how each flag is affected and how many bytes and cycles the instruction uses. There are often helpful examples too. I always have a copy open in a browser when ...
by RobC
Wed Apr 10, 2019 4:16 pm
Forum: hardware
Topic: Prototype MIDI (input) Interface for Music 5000
Replies: 7
Views: 264

Re: Prototype MIDI (input) Interface for Music 5000

Excellent stuff.

I keep meaning to try out the patch I found in the Ample User group newsletter that is supposed to give input from the Music 2000 MIDI interface.
by RobC
Wed Apr 10, 2019 2:27 pm
Forum: hardware
Topic: My New BBC Master
Replies: 17
Views: 390

Re: My New BBC Master

Nice machine - well done! Any tips for desoldering the ULA? I've removed a good number of Video ULAs from Masters and have managed to remove the ULA intact from each one. I use a desoldering pump with a flexible nozzle. I use lots of flux and apply new solder to any joint that doesn't clean up on th...
by RobC
Tue Apr 09, 2019 5:24 pm
Forum: programming
Topic: Which C Compiler?
Replies: 8
Views: 747

Re: Which C Compiler?

fordp wrote:
Tue Apr 09, 2019 12:39 pm
Does anybody have interesting open source projects for a 6502 based Acorn computer in C out there I would love to have a look?
Frotz was mentioned a while back.
by RobC
Fri Apr 05, 2019 8:02 pm
Forum: hardware
Topic: RISC OS 4.39 FileCore Limits
Replies: 8
Views: 257

Re: RISC OS 4.39 FileCore Limits

paulv wrote:
Fri Apr 05, 2019 7:35 pm
It's this card:

http://chrisacorns.computinghistory.org ... _SCSI.html
I have one of those in my A540. When I bought it, I bought a flash rom upgrade from Gary Partis at Partis Computing. Might be worth contacting him for advice - he's helped me with support for other old podules in the past.
by RobC
Fri Apr 05, 2019 11:59 am
Forum: hardware
Topic: RISC OS 4.39 FileCore Limits
Replies: 8
Views: 257

Re: RISC OS 4.39 FileCore Limits

Does RISC OS 4 Filecore have a 4GB partition limit? I thought it was 256GB on RO4 and 6. Pretty sure the boot drive on my RiscPC (4.39) is about 20GB. What symptoms are you seeing with partitions > 4GB? It might be worth checking SCSI2SD. I've only used mine under RISCiX so the partitions are all <...
by RobC
Thu Apr 04, 2019 3:01 pm
Forum: hardware
Topic: Phoebe PCB
Replies: 34
Views: 2643

Re: Phoebe PCB

CCH is active in promoting the use of old technology. One event I could mention (that I was not involved in) was a sort of "Computing classroom of the '80s" where they get a bunch of kids in to do some programming on a network of Beebs. They have at least 50 BBC Bs stacked on a bookshelf, side on. ...
by RobC
Thu Apr 04, 2019 10:45 am
Forum: hardware
Topic: Phoebe PCB
Replies: 34
Views: 2643

Re: Phoebe PCB

However, if the damage has occurred whilst under their watch (so you’ve gone from having something that might have worked to now completely dead) and they’ve just refused to remove it... then that’s pretty bad. I’d much rather have a none knackered and maybe working pheobe thats been altered to one...
by RobC
Wed Apr 03, 2019 1:02 pm
Forum: software: other
Topic: Acorn User Article: Arabic Mosaics
Replies: 7
Views: 201

Re: Acorn User Article: Arabic Mosaics

I remember that article! I bought the November 1985 AU from John Menzies in Swansea on a shopping trip with my parents. I got told off for reading it while we were having lunch in a restaurant! I've still got the magazine :) There are some listings with the article - they're also on the cover disk a...
by RobC
Tue Apr 02, 2019 5:57 pm
Forum: software: classic games
Topic: Beeb bomerman style game?
Replies: 5
Views: 163

Re: Beeb bomerman style game?

Sarah was working on Bomber Blaster a while back - don't know how far it got though.
by RobC
Sun Mar 31, 2019 8:45 am
Forum: for sale / freebies
Topic: FS: New ROM / RAM Expansion Board for BBC B - SOLD OUT
Replies: 34
Views: 933

Re: FS: New ROM / RAM Expansion Board for BBC B

I'd like one if they're still available please.
by RobC
Sat Mar 30, 2019 11:04 am
Forum: hardware
Topic: Acorn SCSI podule AKA31 help...
Replies: 24
Views: 1888

Re: Acorn SCSI podule AKA31 help...

TimoHartong wrote:
Sat Mar 30, 2019 9:17 am
Thank you RobC I used your config file and at least I can see the drive now, format it and open it. I had been busy with it untill 02:00 in the morning without success. If I come near you I buy you a beer ;-).
Glad it was useful to you :D
by RobC
Fri Mar 29, 2019 8:36 am
Forum: hardware
Topic: Watford User Port Splitter
Replies: 11
Views: 338

Re: Watford User Port Splitter

dp11 wrote:
Thu Mar 28, 2019 11:29 pm
may be a 4 x 4053 ( 3 pole 2 way switch )?
Spot on. My "MK III issue 1" uses 4 x Toshiba 4053s.

I'd take a picture of the PCB but it's actually a bit fiddlier than just removing a few screws.
by RobC
Thu Mar 28, 2019 11:17 pm
Forum: hardware
Topic: Watford User Port Splitter
Replies: 11
Views: 338

Re: Watford User Port Splitter

I've definitely got one - will dig it out tomorrow morning.
by RobC
Tue Mar 26, 2019 2:59 pm
Forum: hardware
Topic: eproms
Replies: 6
Views: 275

Re: eproms

I reasoned that pins 1 and 27 determine which slot is selected within all the roms (hence giving up to four slots selected across the four sockets), then the machine selects which socket is active, just as it would for any normal 16k rom, thereby reducing the four possibilities to a single one. Yes...
by RobC
Tue Mar 26, 2019 10:24 am
Forum: hardware
Topic: eproms
Replies: 6
Views: 275

Re: eproms

Take a look at this from the ever useful MDFS.
by RobC
Sat Mar 23, 2019 10:07 am
Forum: for sale / freebies
Topic: Free Book: An Expert Guide
Replies: 6
Views: 388

Re: Free Book: An Expert Guide

I may have a spare for Dave if required.