Search found 477 matches

by IanS
Thu Dec 22, 2016 10:42 pm
Forum: hardware
Topic: Econet pinout
Replies: 9
Views: 688

Econet pinout

According to the Econet Installation guide (and wikipedia) the 5-pin Din pinout is - 1 Data+ 4 Data- 2 Ground 5 Clock- *wrong* 3 Clock+ *wrong* http://chrisacorns.computinghistory.org.uk/docs/Acorn/Manuals/Acorn_Econet_Installation_Guide_88.pdf (page 14) https://en.wikipedia.org/wiki/Econet 5-pin di...
by IanS
Thu Dec 22, 2016 10:38 pm
Forum: general
Topic: Death-dapters - Why you really don't want them...
Replies: 42
Views: 2509

Re: Death-dapters - Why you really don't want them...

lazarusr wrote:UzgIgP0.jpg

Wow, that's a bit special. How long has it been like that? The missing cord grip really puts it in a class of its own.
by IanS
Sun Dec 18, 2016 9:05 pm
Forum: hardware
Topic: WE 32K RAM Card Repair
Replies: 70
Views: 2533

Re: WE 32K RAM Card Repair

Impressive job, Dave obviously taught you well in the art of desoldering.

I'm astounded that you managed to re-use all the old chips.
by IanS
Sun Dec 18, 2016 12:04 am
Forum: hardware
Topic: IFEL A3xx Ram upgrade chips
Replies: 3
Views: 270

Re: IFEL A3xx Ram upgrade chips

Is your board removable, or soldered on place? It looks like it attaches to the same places as many other A3xx memory upgrades - e.g. Simtec - http://www.simtec.co.uk/products/AU4M310/files/fitting.pdf But instead of lifting the resistors off the motherboard to pick up the data bus, it has pins tha...
by IanS
Sat Dec 17, 2016 8:28 pm
Forum: hardware
Topic: IFEL A3xx Ram upgrade chips
Replies: 3
Views: 270

IFEL A3xx Ram upgrade chips

Can anyone suggest a source of Memory chips for the IFEL board in my A305.
It looks like it just needs another 4 chips to push it from 2MB to 4MB.

The overall design looks more complicated than the average A3xx memory upgrade with buffers and GALs.
by IanS
Sat Dec 17, 2016 8:22 pm
Forum: hardware
Topic: Archimedes Test ROMs
Replies: 26
Views: 1614

Re: Archimedes Test ROMs

It's not pretty, but it works and it just plugs in, so it is reversable.
by IanS
Thu Dec 15, 2016 11:29 pm
Forum: hardware
Topic: Archimedes Test ROMs
Replies: 26
Views: 1614

Re: Archimedes Test ROMs

It lives!!! Great news, now you get to enjoy the long forgotten Archimedes operating system :) So with 4 times the space needed for Arthur in those flash chips, I should be able to make it switchable between 4 512K OS's. I'd say Arthur 0.3, Arthur 1.2, RISC OS 2 and some test ROMs? A good choice, I...
by IanS
Wed Dec 14, 2016 8:35 pm
Forum: hardware
Topic: Archimedes Test ROMs
Replies: 26
Views: 1614

Re: Archimedes Test ROMs

It lives!!! IMG_20161214_202227181.jpg IMG_20161214_202213916.jpg So that's an A305, original MEMC, 2MB Ram, Arthur 1.20 (from 4corn) My Arc doesn't currently have any batteries, so I was holding delete to do a CMOS reset. Don't do that, Arthur doesn't boot. Hold R, or nothing. So with 4 times the s...
by IanS
Tue Dec 13, 2016 11:53 pm
Forum: hardware
Topic: Archimedes Test ROMs
Replies: 26
Views: 1614

Re: Archimedes Test ROMs

At the moment I think I'm more concerned that the file I have isn't exactly 512K, if anyone has another image, can they post it somewhere?

Edit: There is a 512K image on 4corn - http://www.4corn.co.uk/archimedes.php

I'll try that tomorrow.
by IanS
Tue Dec 13, 2016 8:56 pm
Forum: hardware
Topic: Archimedes Test ROMs
Replies: 26
Views: 1614

Re: Archimedes Test ROMs

This is probably irrelevant, but I'll mention it anyway... One other funny thing I ran into with Arthur 0.30 is that it'll wait forever for an Econet clock, if the module is fitted. They fixed that for Arthur 1.20. It doesn't even intialise the video display, so I think it's just not working. As it...
by IanS
Tue Dec 13, 2016 8:27 pm
Forum: hardware
Topic: Archimedes Test ROMs
Replies: 26
Views: 1614

Re: Archimedes Test ROMs

Arthur is very fussy. 0.3 won't even boot if you have more than 1mb RAM, so it wouldn't be surprising if 1.2 would only run on a fairly basic machine. Arthur certainly doesn't know about ARM 3, so won't enable the cache. Possibly the MEMC1a required for ARM3 could be the problem? I tried putting Ar...
by IanS
Tue Dec 13, 2016 12:48 pm
Forum: hardware
Topic: Archimedes Test ROMs
Replies: 26
Views: 1614

Re: Archimedes Test ROMs

Is the ARM3 a problem?, I guess I should try RISC OS 2.00. ARM3 support was added in RISC OS 2.01, but I am fairly sure that this was only "detect and switch on cache", so 2.00 would also work, but with cache disabled (and hence even a bit slower than an ARM2). Yes, I tried 2.00 in 4Mb fl...
by IanS
Tue Dec 13, 2016 11:57 am
Forum: hardware
Topic: Archimedes Test ROMs
Replies: 26
Views: 1614

Re: Archimedes Test ROMs

So to slightly hijack this thread. Has anyone tried the available rom dumps on real hardware. I've got a copy of the "virtually free" roms - http://www.riscos.com/shop/products/101/index.htm I've programmed the data (de-interleaved) into 4 flash chips (28sf040). I can get 3.11 3.10 and RIS...
by IanS
Mon Dec 12, 2016 3:24 pm
Forum: hardware
Topic: Here's a thought: ARA for the Archie?
Replies: 16
Views: 861

Re: Here's a thought: ARA for the Archie?

I think Computer Concepts built such a podule, available in the early days (maybe 1st year) of the Archies. EDIT : Bingo : http://chrisacorns.computinghistory.org.uk/32bit_UpgradesA2G/CC_ROMRAM.html Don't know how easy it would be to duplicate ... (and if sbdy owns one. It's not in my collection, u...
by IanS
Sat Dec 10, 2016 9:48 pm
Forum: hardware
Topic: BBC B: replacing PSU capacitors, general questions
Replies: 18
Views: 917

Re: Issue 7 BBC B: Power cables soldered to the board

Tug hard, they are spade connectors, there is a bit soldered to the board and a crimped bit on the end of the wire, they are just a friction fit.
by IanS
Tue Dec 06, 2016 7:15 pm
Forum: general
Topic: Today I received.....
Replies: 4322
Views: 253192

Re: Today I received.....

steve3000 wrote:Just need to find some early Arthur 0.2 ROMs to make a very retro Archimedes now.

0.30 is easily available (http://www.riscos.com/shop/products/101/index.htm)

Was 0.20 ever distributed? (I started at an A3000, so only just remember the RISC OS 2 to 3 transition)
by IanS
Tue Dec 06, 2016 10:36 am
Forum: hardware
Topic: White noise and PCB flux cleaner.
Replies: 38
Views: 1777

Re: White noise and PCB flux cleaner.

flynnjs wrote:Martin, nice addition to my various other "cleaned up" schecmatics. Did you do that?
Do you know if is it raster only, or is it in vector or CAD format?

Looks to be the one listed here - http://8bs.com/insides.htm as "A redrawn diagram by J.Tribbeck."
by IanS
Mon Dec 05, 2016 5:06 pm
Forum: hardware
Topic: Archimedes Test ROMs
Replies: 26
Views: 1614

Re: Archimedes Test ROMs

I have some test roms that I got from Uniqueway along with a A3/4xx TRM on ebay many years ago. I've never tried them. I was surprised to find that they are interleaved, considering that other 4 ROM dumps of RISC OS are not interleaved. The files are exact dumps of the Eproms from the picture. I'd ...
by IanS
Mon Dec 05, 2016 1:39 pm
Forum: hardware
Topic: Archimedes Test ROMs
Replies: 26
Views: 1614

Re: Archimedes Test ROMs

Pernod wrote:Does anyone have the Test ROMs that are referenced in the A300 service manual? The ROMs replace Arthur to carry out memory tests.

I have some test roms that I got from Uniqueway along with a A3/4xx TRM on ebay many years ago. I've never tried them.
IMG_20161205_124337209_HDR.jpg
by IanS
Sun Dec 04, 2016 4:40 pm
Forum: past events & exhibitions
Topic: ABug North 18/19/20 November 2016, Bolton
Replies: 199
Views: 12411

Re: ABug North 18/19/20 November 2016, Bolton

Thanks Ian I can bring my Atom along to the next meet or I can PayPal you some spons :) Cheers I might have to invest in a colour board and AtomMMC now :D Can they live in harmony or are they incompatible? Unless you are in a rush, It's probably best done at the next meet. We can then ensure it all...
by IanS
Sun Dec 04, 2016 4:35 pm
Forum: past events & exhibitions
Topic: ABug North 18/19/20 November 2016, Bolton
Replies: 199
Views: 12411

Re: ABug North 18/19/20 November 2016, Bolton

Yes, it's just a PCB of the earlier Vero version. (74ls245 changed for a 244, the 245 made the vero layout easier) I'm supprised you swapped it the 245 would have made the design of the pcb easier as well. Or was it a cost thing? Interesingly enough there are versions of the 244 with the inputs &am...
by IanS
Sun Dec 04, 2016 12:04 pm
Forum: past events & exhibitions
Topic: ABug North 18/19/20 November 2016, Bolton
Replies: 199
Views: 12411

Re: ABug North 18/19/20 November 2016, Bolton

Yes, it's just a PCB of the earlier Vero version. (74ls245 changed for a 244, the 245 made the vero layout easier)

It is just the original Atom Econet Rom.

Phil, One of the boards is earmarked for you, I offered to make you one, when you expressed an interest at an earlier Abug meeting.
by IanS
Sat Dec 03, 2016 4:40 pm
Forum: off-topic
Topic: LOLPRICE
Replies: 2681
Views: 187493

Re: LOLPRICE

£995 for a cd caddy?!!!! http://m.ebay.co.uk/itm/NEW-CD-Caddy-as-used-by-some-early-Sony-Apple-etc-CD-drives-/182350700543?hash=item2a74f2dfff%3Ag%3AkEQAAOSwXeJYJcFL&_trkparms=pageci%253Aea088060-b970-11e6-95a3-74dbd1a0385b%257Cparentrq%253Ac565bf671580a6a8d0d46e9effdfd2f1%257Ciid%253A6 And you...
by IanS
Wed Nov 30, 2016 9:02 pm
Forum: past events & exhibitions
Topic: ABug North 18/19/20 November 2016, Bolton
Replies: 199
Views: 12411

Re: ABug North 18/19/20 November 2016, Bolton

If anyone I bored at Bolton with pictures of the Atom Econet PCB I'd had made at OSH Park was interested in how they turned out, they arrived in the post today. It works :D :D :D If I did it again, I'd change a few things, but it didn't require any bodge wires, so I'm happy. IMG_20161130_203138584_H...
by IanS
Fri Nov 25, 2016 7:29 pm
Forum: hardware
Topic: Pcb board making
Replies: 30
Views: 2294

Re: Pcb board making

I followed the contextual electronics tutorial for KiCAD - https://contextualelectronics.com/learning/getting-to-blinky-4-0/ It got me through designing my first real board, but I haven't had them back from manufacture yet. I went for the more expensive, but simpler option of OSH park https://oshpar...
by IanS
Sun Nov 20, 2016 6:19 pm
Forum: past events & exhibitions
Topic: ABug North 18/19/20 November 2016, Bolton
Replies: 199
Views: 12411

Re: ABug North 18/19/20 November 2016, Bolton

Did the key that was found get reunited with its owner?
by IanS
Sat Nov 19, 2016 12:46 am
Forum: past events & exhibitions
Topic: ABug North 18/19/20 November 2016, Bolton
Replies: 199
Views: 12411

Re: ABug North 18/19/20 November 2016, Bolton

During Pizza consumption.
IMG_20161118_211410446_HDR.jpg

IMG_20161118_211403362_HDR.jpg
by IanS
Fri Nov 18, 2016 1:25 pm
Forum: hardware
Topic: Jaz 2GB on A3000
Replies: 6
Views: 455

Re: Jaz 2GB on A3000

So, to clarify you need the specific card's software, even to format and partition a device? I assumed as it showed up in *Devices, that a generic program would do the trick? Yes, mosy cards had custom software to partition and format. The "Devices command is (probably) provided by the softwar...
by IanS
Fri Nov 18, 2016 10:30 am
Forum: hardware
Topic: Jaz 2GB on A3000
Replies: 6
Views: 455

Re: Jaz 2GB on A3000

I'm trying to get a collection of the support software for variaous SCSI and IDE boards. I don't think I have the Serial Port software, but I'll check later. I don't think the MOFS software ever expected it to need partition support, as it was originally intended for things like flopticals, which we...
by IanS
Thu Nov 17, 2016 10:48 pm
Forum: hardware
Topic: Jaz 2GB on A3000
Replies: 6
Views: 455

Re: Jaz 2GB on A3000

RISC OS 3 on an A3000 won't support anything bigger then 512MB in a single partition.

Which SCSI card have you got?

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