Search found 466 matches

by IanS
Thu Nov 16, 2017 5:38 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 124
Views: 3652

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

sPhilMainwaring wrote:Ian S: Will you have any of your Atom Econet boards with you at ABUG? I've *finally* remembered to take one of my Atoms with me!

Yes, it's been on my list of things to take to the next ABUG since the last meet.
by IanS
Wed Nov 15, 2017 8:30 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 124
Views: 3652

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

Anyone going at the weekend got a spare dram chip KM41C1000P-12 (1Mx1bit), or equivalent they can bring along for my A440/R140?

viewtopic.php?f=16&t=14064
by IanS
Wed Nov 15, 2017 8:26 pm
Forum: hardware
Topic: A440/R140 Memory Error
Replies: 0
Views: 56

A440/R140 Memory Error

So my R140 started flashing an error code on startup, but generally seemed to work ok after the post code had finished. Decoding the error code gives "Long RAM test failure". So I put a set of Test roms in to run the memory test. Looks to me like D29 is broken:- IMG_20171114_210026995_HDR-...
by IanS
Sat Nov 11, 2017 11:38 pm
Forum: hardware
Topic: Trojan Room Coffee Pot
Replies: 8
Views: 261

Re: Trojan Room Coffee Pot

Watch the Extra bits video - https://www.youtube.com/watch?v=oZ1EddSnwdc

Explains how it got moved from the unreliable VME kit, to an Arc.
by IanS
Mon Nov 06, 2017 11:54 pm
Forum: hardware
Topic: Broken MDFS
Replies: 30
Views: 974

Re: Broken MDFS

OK, makes sense. The scsi2sd manual does say that man can live on TERMPWR alone, but it's a bit vague about how much exactly it needs. If the other SCSI cable doesn't help then I'll try again tomorrow with a better PSU. I guess I should also configure the MDFS for serial printing (or buy a parallel...
by IanS
Sun Nov 05, 2017 10:02 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2474
Views: 174008

Re: Worth Taking a Look At

danielj wrote:That backplane looks ostensibly identical to an A5000 backplane?

d.

The connector that plugs into the motherboard is on the other side.
by IanS
Mon Oct 23, 2017 11:41 pm
Forum: hardware
Topic: Arduino Filestore
Replies: 36
Views: 1180

Re: Arduino Filestore

I mentioned a while back that I was working on getting an Arduino talking to an Econet card, in the last couple of days I've just about managed to get a reliable 4 way handshake working, which means I've been able to start implementing the file server operations: ... Right now this is very much a w...
by IanS
Wed Oct 18, 2017 6:29 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2474
Views: 174008

Re: Worth Taking a Look At

An Econet tester and software ... http://www.ebay.co.uk/itm/Acorn-Computer-Econet-Tester-/292298191627?hash=item440e54730b:g:igUAAOSwmeRZ52bl Could be one to re-engineer. It's on my list. I don't have the software, but I do have the hardware. Beebmaster also has one http://www.beebmaster.co.uk/Econ...
by IanS
Sun Oct 15, 2017 10:37 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 61
Views: 2471

Re: RISC-PC Not Working

Yes, that's basically it, except it "looks" like a triangle as the two diodes are both connected to the same 5V point on the backplane. There's no diode in the battery holder, it's just a 3xAA battery holder which has 3 rechargeable batteries in. So what I hope I've done is to allow the R...
by IanS
Sun Oct 15, 2017 9:23 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 61
Views: 2471

Re: RISC-PC Not Working

5V on backplane has 2 diodes connected to it, one in one direction, t'other in th't t'other. One diode goes to the battery 5V so that the diode blocks the battery from keeping the computer powered. The other diode connects to 5V on the clock chip, at that point it is also connected to the battery 5...
by IanS
Sun Oct 15, 2017 8:05 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 61
Views: 2471

Re: RISC-PC Not Working

BeebMaster wrote:5V on backplane has 2 diodes connected to it

Sounds wrong.
by IanS
Sun Oct 15, 2017 8:01 pm
Forum: general
Topic: Today I received.....
Replies: 4270
Views: 236483

Re: Today I received.....

Over the past week really… An Acorn AKA31 SCSI Podule off eBay and from CJE, an AEH54 Ethernet Podule and MEMC1A chip. Hopefully, this will let me get to the point being able to run RISC iX on one of my Archimedes. Steve It's fairly easy to convert the AEH54 to add an AUI connector, makes connectin...
by IanS
Sun Oct 15, 2017 6:46 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 61
Views: 2471

Re: RISC-PC Not Working

philb wrote:If you are using a rechargeable battery, one diode suffices.

Or a master battery pack, which will already have a diode in.
by IanS
Sun Oct 15, 2017 3:25 pm
Forum: hardware
Topic: RISC-PC Not Working
Replies: 61
Views: 2471

Re: RISC-PC Not Working

You need another diode, so the battery isn't trying to power the whole machine when the power is off. Something like this:-
arc_clock.png

Diagram based on the A300 clock/battery circuit.
by IanS
Sat Oct 14, 2017 9:47 pm
Forum: hardware
Topic: Computer Concepts 32K and 128K sideways ROM?
Replies: 12
Views: 312

Re: Computer Concepts 32K and 128K sideways ROM?

It could use a similar system to the Watford roms:-

viewtopic.php?f=2&t=9272&p=106787#p108446
by IanS
Sat Oct 14, 2017 9:39 pm
Forum: software: other
Topic: BBC Domesday Project - Source code available
Replies: 13
Views: 711

Re: BBC Domesday Project - Source code available

I'll claim a small part in this recovery. This is the machine that Xavier bought on Ebay - http://www.ebay.co.uk/itm/Working-Acorn-A500-prototype-archimedes-LOFT-FIND-/122622471946 http://stardot.org.uk/forums/viewtopic.php?f=16&t=13540&p=177673 I think Dave (Arcadian) collected the machine,...
by IanS
Sun Oct 08, 2017 7:49 pm
Forum: for sale / freebies
Topic: BeebSCSI mini
Replies: 67
Views: 4213

Re: BeebSCSI mini

flynnjs wrote:Sorry for the delay, I've now made them available on my store webpage.

Your T&C's are still silly.

http://www.xeropage.co.uk/shop/index.ph ... ent_only=1
by IanS
Sun Oct 01, 2017 3:28 pm
Forum: software
Topic: ST-506 Hard disc image creation
Replies: 17
Views: 471

Re: ST-506 Hard disc image creation

If you modify this prog to copy the whole drive, it ends up looking almost identical to crj's proposed code posted earlier. You will need to edit the program with the correct source disc size (PSize%), and the location of the output file. Thanks, I think I now have an image of the drive. I pressume...
by IanS
Sat Sep 30, 2017 5:56 pm
Forum: software
Topic: ST-506 Hard disc image creation
Replies: 17
Views: 471

Re: ST-506 Hard disc image creation

BeebMaster wrote:Can you use dd within RISCix?

Yes, in theory.

I think that just trades one problem into many others. I'd then have to work out how to get networking working and a way to copy the file from RISCiX.

I'll probably just stick with the file level copy I have.
by IanS
Sat Sep 30, 2017 4:29 pm
Forum: software
Topic: ST-506 Hard disc image creation
Replies: 17
Views: 471

Re: ST-506 Hard disc image creation

If you have a SCSI podule in your A440, you could file copy everything to a SCSI drive and image that using a SCSI-fitted PC using Linux DD? (I know, lot of assumptions..) I already have a file level copy of the data, I was trying to get a bit-for-bit disc image. Doesn't seem like there is anything...
by IanS
Sat Sep 30, 2017 1:21 pm
Forum: software
Topic: ST-506 Hard disc image creation
Replies: 17
Views: 471

Re: ST-506 Hard disc image creation

I was trying to avoid having to write anything, I was looking for something that would just work. I don't have any other ADFS hard disc to try it on, and I don't want to be using the old drive any longer than necessary. I came across this a couple of years ago -- looks like the programming has alre...
by IanS
Sat Sep 30, 2017 12:42 pm
Forum: software
Topic: ST-506 Hard disc image creation
Replies: 17
Views: 471

Re: ST-506 Hard disc image creation

How's your programming? It may be worth seeing whether ADFS_DiscOp 1 gets data off the disc. If it does, write a loop to read a few hundred kilobytes at a time and store them somewhere; you might be home and dry. I was trying to avoid having to write anything, I was looking for something that would...
by IanS
Sat Sep 30, 2017 12:12 pm
Forum: software
Topic: ST-506 Hard disc image creation
Replies: 17
Views: 471

ST-506 Hard disc image creation

If I had an old ST-506 drive connected to an A440, what would be a way to create a bit-for-bit copy of the drive. I have IDE and SCSI drives to put the image on, which can then be copied over Econet or Ethernet to other machines for safe keeping. I had planned to use !FCFS to read the drive, but it ...
by IanS
Mon Sep 25, 2017 6:11 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 124
Views: 3652

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

tricky wrote:
IanS wrote:...
Thanks.

Anyone want to swap room?


I haven't paid yet, but am happy to swap.

Thanks tricky.
by IanS
Sun Sep 24, 2017 8:11 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD
Replies: 124
Views: 3652

Re: ABUG EAST MIDLANDS (Winter Warmer) 17-19 November 2017 (Leicestershire) BOOKING THREAD

sixxdog_uk wrote:Sorry Ian , you are quite right , i knew i'd miss someone out. :(

Mark (Retroclinic) is a non kit sunday only so i'll put you in his slot and move mark to the non kit list ,

In short yes ,you're in :)

Thanks.

Anyone want to swap room?
by IanS
Mon Sep 18, 2017 4:24 pm
Forum: hardware
Topic: BBC SD Card on Ebay
Replies: 12
Views: 645

Re: BBC SD Card on Ebay

I'm sorry if some of you have a problem with this Just to be clear, I don't have a problem with these being sold, I was just curious who was selling them. They look good, I'd been thinking of doing something similar to Lazarus's SD card that fits under the beeb, but these are probably close enough....
by IanS
Sun Sep 17, 2017 5:07 pm
Forum: hardware
Topic: BBC SD Card on Ebay
Replies: 12
Views: 645

BBC SD Card on Ebay

by IanS
Fri Sep 15, 2017 8:07 pm
Forum: projects
Topic: Screenshot accessory for Arthur desktop
Replies: 4
Views: 534

Re: Screenshot accessory for Arthur desktop

IanS wrote:Interesting, I'll give this a try when I next have my switchable OS machine out.


It did get tried at the Abug meet in January, only just got round to getting the pics off my phone.
by IanS
Mon Sep 11, 2017 9:17 pm
Forum: upcoming and recent events & exhibitions
Topic: Retro Computer Festival - CCH, Cambridge - 16 & 17 September 2017
Replies: 28
Views: 1398

Re: Retro Computer Festival - CCH, Cambridge - 16 & 17 September 2017

This event is next weekend, anyone planning to go?

I should be there on Saturday from about lunch time.

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