Search found 211 matches

by philb
Sat Oct 10, 2020 11:55 am
Forum: 8-bit acorn hardware
Topic: B+
Replies: 29
Views: 764

Re: B+

Mm, fairly sure it's not that. My best guess at the moment is that it really is a B+ but it's had the wrong OS ROM fitted at some point for whatever reason. Might have to exhume my EPROM programmer... !
by philb
Sat Oct 10, 2020 11:49 am
Forum: 8-bit acorn hardware
Topic: B+
Replies: 29
Views: 764

Re: B+

Yeah, that's what I was wondering. It looks pretty much like I remembered a B+ being; it's got the ROM sockets at the back left and the footprint for the extra RAM header in the bottom right, so I'd jumped to the conclusion that's what it was. But I don't think I've ever seen a US or German model B ...
by philb
Sat Oct 10, 2020 11:38 am
Forum: 8-bit acorn hardware
Topic: B+
Replies: 29
Views: 764

B+

Just trying to resurrect a B+ (or at least I think it's a B+) that I've had sitting in a corner for quite some time. I've replaced the primary side capacitors in the power supply and it seems to power up fine. A few questions... The startup banner says "BBC Computer 32k" which sounds rather more lik...
by philb
Wed Oct 03, 2018 4:58 pm
Forum: other vintage hardware, software and languages
Topic: Question about linear PSUs
Replies: 12
Views: 1048

Re: Question about linear PSUs

Agreed, I don't think you want to do a full "live" test of the SCR crowbar circuit. If you do fire the crowbar then at best it will almost certainly blow a fuse, which might be irritating to replace, at worst you might end up overstressing or destroying some of the other components in the process, a...
by philb
Mon Oct 01, 2018 2:56 pm
Forum: 8-bit acorn hardware
Topic: MicroVitec CUB Flyback / LOPT Replacement
Replies: 1
Views: 388

Re: MicroVitec CUB Flyback / LOPT Replacement

What made you decide that the LOPT is bad? If it does eventually focus after it's warmed up, and there isn't any obvious arcing or other sign of HV breakdown, I don't think I would necessarily rush to suspect the LOPT. That said if you've already bought the part then I guess there's no harm in swapp...
by philb
Sat Sep 29, 2018 7:52 pm
Forum: 8-bit acorn hardware
Topic: MDFS Key Losted
Replies: 17
Views: 1705

Re: MDFS Key Losted

I'm fairly sure the Nexus keys are the same L&F series as the MDFS ones, just a different code number. If you can get someone with an original key to tell you the number (or it might even be stamped on the lock body, I forget) then you should be able to order one through the same link I posted earli...
by philb
Sat Sep 29, 2018 4:45 pm
Forum: 8-bit acorn hardware
Topic: MDFS Key Losted
Replies: 17
Views: 1705

Re: MDFS Key Losted

I've got the key to hand, I just have to hit timpsons :D Against all odds, my lost bunch of keys has just turned up (in, er, my wife's suitcase). And now that I have my own MDFS key back I was able to discover that, for future reference, it seems to be fairly easy to order duplicates. For example: ...
by philb
Fri Sep 21, 2018 10:10 pm
Forum: 8-bit acorn hardware
Topic: What are people happy soldering ?
Replies: 43
Views: 3177

Re: What are people happy soldering ?

I'd have voted for "through hole", but actually I have soldered the SMT ICs onto the PiTube Direct level shifter with no problems. I don't know what kind of SMT those were though! So I voted for 1.27mm. Might have been less than that. I'm not quite sure what ICs were on that board but if they were ...
by philb
Wed Sep 19, 2018 12:35 pm
Forum: 8-bit acorn hardware
Topic: New hardware suggestion - Pi econet server
Replies: 51
Views: 4677

Re: New hardware suggestion - Pi econet server

There is a lot of circuitry relating to collision detection on an Econet module. On a quiet Econet of maybe two machines I recon that can all be dispensed with and a couple of single chip RS 485 line driver/receivers would do. I think you're probably right that collision detect is not strictly nece...
by philb
Mon Sep 17, 2018 9:57 pm
Forum: 8-bit acorn software: other
Topic: BBC - Torch Communications Software
Replies: 3
Views: 625

Re: BBC - Torch Communications Software

Oh, that's quite cool. I also have a bunch of Torch hardware lying around but I don't think I have a copy of UNIVIEW. I'll have to look it out.
by philb
Mon Sep 17, 2018 9:42 pm
Forum: 8-bit acorn hardware
Topic: New hardware suggestion - Pi econet server
Replies: 51
Views: 4677

Re: New hardware suggestion - Pi econet server

awilliams wrote:
Mon Sep 17, 2018 1:24 am
Having said all that A Ethernet to Econet bridge might also prove to be a solutions, Phil Blundall did one taking an ADF10 module in 2005.
Yes. Gosh, that was a long time ago.
by philb
Mon Sep 17, 2018 9:38 pm
Forum: 8-bit acorn hardware
Topic: New hardware suggestion - Pi econet server
Replies: 51
Views: 4677

Re: New hardware suggestion - Pi econet server

A suitable microcontroller would be a better (and cheaper) choice rather than a PI Zero. Right, agreed. The design that I just exhumed from my hard disk has an ATSAME53 doing most of the work and a Lattice iCE40 in front of it. Originally I think the micro was going to be a SAMS70 but the E53 seeme...
by philb
Mon Sep 17, 2018 10:03 am
Forum: 8-bit acorn hardware
Topic: New econet setup
Replies: 89
Views: 6614

Re: New econet setup

My first stage plan is to just get two beebs to talk to each other. This looks to be a simple case of connecting each one to the clock. Maybe you just glossed over this because it was too obvious to be worth mentioning, but you need at least one terminator as well. Ideally you'd have two (one at ea...
by philb
Mon Sep 17, 2018 10:01 am
Forum: 8-bit acorn hardware
Topic: New econet setup
Replies: 89
Views: 6614

Re: New econet setup

Lardo Boffin wrote:
Mon Sep 17, 2018 9:12 am
I am hapy enough just to load to sideways RAM when required in the short term if anyone has an image?
http;//pbcl.net/bbc/ANFS425
by philb
Sun Sep 16, 2018 4:34 pm
Forum: for sale / freebies
Topic: Aries shadow RAM boards
Replies: 6
Views: 1066

Re: Aries shadow RAM boards

Good point, that does sound vaguely familiar. I think I have a working Beeb at my office with a B20 in (and no B32), I'll have to take a peek and see exactly how it's set up.
by philb
Sun Sep 16, 2018 4:12 pm
Forum: 32-bit acorn hardware
Topic: A3000 keyboard connectors needed please.
Replies: 5
Views: 647

Re: A3000 keyboard connectors needed please.

I searched these forums and read that Farnell might have them but what do I search for? They're FFC (flat flexible cable) sockets. Might also be described FPC (flex printed circuit) or "flex PCB connectors". The ones in the A3000 are 2.54mm pitch and 20 contacts. I don't know offhand what the cable...
by philb
Sun Sep 16, 2018 4:03 pm
Forum: for sale / freebies
Topic: Aries shadow RAM boards
Replies: 6
Views: 1066

Re: Aries shadow RAM boards

I conducted a slightly more detailed survey, which reveals that I have three B32s but all of them need some repair to the 40-pin header that plugs into the CPU socket. I've no idea what one of those is worth really, how does £15 including postage sound? CJE are listing them for about £70 but presuma...
by philb
Sun Sep 16, 2018 1:55 pm
Forum: for sale / freebies
Topic: Aries shadow RAM boards
Replies: 6
Views: 1066

Aries shadow RAM boards

I just found a box of Aries B20 and B32 boards in varying conditions. Any use to anybody?
by philb
Sun Sep 16, 2018 11:31 am
Forum: 8-bit acorn hardware
Topic: New hardware suggestion - Pi econet server
Replies: 51
Views: 4677

Re: New hardware suggestion - Pi econet server

I have a question for people who've looked at it before. My first thought for doing this was to hook the Pi up to the 5 pins on the Econet jack via some level shifters and have the Pi emulate the clock etc as well as the file server. Looking at the links to past projects it seems like most people i...
by philb
Mon Sep 10, 2018 2:28 pm
Forum: past physical ABug events
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 207
Views: 24201

Re: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD

You might want to try just playing the tape into an actual Beeb and doing a basic tape-to-disc/DataCentre/MMFS transfer, if you can. More details in the above thread. Ah right, fair enough. If that yields better or more reliable results then I'm happy to do that. Most of the discs will be 5.25-inch...
by philb
Mon Sep 10, 2018 1:41 pm
Forum: past physical ABug events
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 207
Views: 24201

Re: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD

I had already PM'd Jason/jbnbeeb before I saw your post to see if some of us could arrange a date to do some archiving. But if you're local to the area and able to get there more easily and you have the skills to rescue the software, that would be a better option. Yeah, my office is only about 15 m...
by philb
Mon Sep 10, 2018 1:35 pm
Forum: 8-bit acorn hardware
Topic: MDFS Key Losted
Replies: 17
Views: 1705

Re: MDFS Key Losted

It may or may not be correctly described as a "hard disc sharer". I think that's a fair description (assuming yours isn't broken!). Admittedly the shared bit is read-only, but... They're also the only Acorn related thing I can think of that uses a transputer, so there's a certain novelty value there.
by philb
Mon Sep 10, 2018 1:16 pm
Forum: 8-bit acorn hardware
Topic: BBC B beep of death
Replies: 30
Views: 2507

Re: BBC B beep of death

I note you've tried S25 north and south, but have you tried fitting an inveter (e.g. 7404) to swap the memory banks? As built, toggling S25 enables and disables the upper 16K, but if you have a memory fault in the lower 16K it could still be stopping your machine from booting. Isn't that what remov...
by philb
Mon Sep 10, 2018 12:45 pm
Forum: past physical ABug events
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 207
Views: 24201

Re: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD

lurkio wrote:
Mon Sep 10, 2018 11:04 am
Hi, Jason. Looks like none of the items on the list were rescued, in the end. :(
Oh, that's a bit sad. I'm happy to stop by the museum some other time and archive them.
by philb
Mon Sep 10, 2018 7:17 am
Forum: 32-bit acorn hardware
Topic: Just bought A3000 and have some questions
Replies: 4
Views: 789

Re: Just bought A3000 and have some questions

could the DB9 RGB socket on the 1084S be used to connect to the A3000? Just thinking of convenience as the 1084S is currently on my desk. Ah yes, I think that would work fine as well. Sorry, I didn't quite register the presence of that socket in your first post. As you say, the AKF11 and AKF12 are ...
by philb
Sun Sep 09, 2018 7:03 pm
Forum: 8-bit acorn software: other
Topic: Econet Expansion Rom
Replies: 6
Views: 903

Re: Econet Expansion Rom

I'd never heard of this before but, from the list of commands, it looks like it's mostly a way of getting a convenient command line interface to the econet "immediate operations". So you can halt a remote machine (and tell it to continue again), read and write its memory, force it to execute a BRK, ...
by philb
Sun Sep 09, 2018 6:39 pm
Forum: 32-bit acorn hardware
Topic: Just bought A3000 and have some questions
Replies: 4
Views: 789

Re: Just bought A3000 and have some questions

This is what you need for the mouse: https://stardot.org.uk/forums/viewtopic.php?t=13180 For the monitor, the easiest way to get started would be to use the composite input on your Commodore monitor. The A3000 has a phono CVBS output which will plug straight in with a standard cable. But the video q...
by philb
Fri Sep 07, 2018 9:15 pm
Forum: 8-bit acorn hardware
Topic: MDFS Key Losted
Replies: 17
Views: 1705

Re: MDFS Key Losted

I don't seem to have been overwhelmed with alternative offers so... yes please 8)
by philb
Fri Sep 07, 2018 9:14 pm
Forum: past physical ABug events
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 207
Views: 24201

Re: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD

I'm going to come along on Sunday at some point. No gear (unless you count my daughter) but I look forward to seeing what everyone else has going on. I seem to recall the museum has an HDFS in their collection somewhere. I wonder if they could be persuaded to allow the PROMs and disk to be imaged an...
by philb
Thu Sep 06, 2018 9:43 pm
Forum: 8-bit acorn hardware
Topic: MDFS Key Losted
Replies: 17
Views: 1705

Re: MDFS Key Losted

Back from t'north... It occurs to me that if anybody attending the Cambridge meetup this weekend happened to bring an MDFS key with them then that'd be an ideal opportunity for me to get a duplicate cut and save Daniel the trouble. There's a locksmith (and failing that, two branches of Timpsons) wit...

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