Search found 315 matches

by simonm
Mon Apr 29, 2019 9:17 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Thanks for the help so far everyone! Have you done another DEL on power on since getting the VIDC clock reconnected? If not, do this first to see if the CMOS RAM checksum error goes away. If it does, then we're making progress. If not then we may have a common issue in reading the CMOS and accessing...
by simonm
Mon Apr 29, 2019 12:02 am
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Aha, I reconnected the floppy drive and it's now flashing error codes at me. So those PL3a jumpers must have been necessary to get the POST to start maybe. Decoding the fault code gives me 00020101. I'm reading that as a RAM control line failure, and CMOS RAM checksum fail ? (no flag for ARM3 detect...
by simonm
Sun Apr 28, 2019 11:28 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Ok, so are you booting without the colour card fitted? If so, you may be missing the jumpers you need to connect the sysclock to the VIDC chip at the very least. You will need a jumper on 1-2 and 3-4 of PL3a to use the machine without the colour card I believe. Paul Good thinking - yes I was bootin...
by simonm
Sun Apr 28, 2019 10:31 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Ok I tried the motherboard in the other machine and same result, so that helps to eliminate the PSU to some degree. The fact that there's only 2 speaker clicks (seems to be 5 on a good powerup), and no display output indicates it's not even getting to the stage where the POST runs...
by simonm
Sun Apr 28, 2019 5:57 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Did you have the floppy drive connected? If so, you can check if it flashes a fault code. Great idea thanks, I'll try that. Hmm... plugged in floppy drive (tried two different drives). Nothing - no LED activity, not even a powerup seek. I'm going to try swapping the motherboards with the other comp...
by simonm
Sun Apr 28, 2019 5:43 pm
Forum: 8-bit acorn hardware
Topic: Another BBC Master revived, thanks to this forum!
Replies: 6
Views: 947

Re: Another BBC Master revived, thanks to this forum!

Great work! =D> Love seeing old machines rescued from the dead.
You are right, this forum and it's super helpful & knowledgeable community is brilliant.
by simonm
Sun Apr 28, 2019 5:15 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

That IFEL ARM3 upgrade is the UBER rare only ~400 CPU's made 36MHz version of the ARM 3 chip. The fastest ARM3 there is... For a tenner for the entire machine, I'd say you have the bargain of the century if only the ARM3 board works... Paul Wow, that sounds like good fortune then! :shock: I thought...
by simonm
Sun Apr 28, 2019 1:19 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Clearly this machine has had a few mods. The power led has been hacked to show the IDE HDD access light, and the power cables have been cut at some point then gaffer taped back together. So I reassembled and tried a power up + delete. No joy on this one - same as last time, so I replaced C37. Now, t...
by simonm
Sun Apr 28, 2019 1:10 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Thought I recap the PSU next. This one looks like caps have already been changed, but I replaced them again anyway.
2019-04-27 23.25.45.jpg
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2019-04-27 23.53.02.jpg
2019-04-27 23.52.30.jpg
2019-04-27 23.53.45.jpg
by simonm
Sun Apr 28, 2019 1:08 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

So I washed the board & metal with white vinegar, water & IPA. Looks better now, but not sure how much damage was done.
2019-04-22 18.30.05.jpg
2019-04-22 18.29.42.jpg
2019-04-22 18.30.10.jpg
2019-04-22 19.23.03.jpg
2019-04-28 00.32.13.jpg
by simonm
Sun Apr 28, 2019 1:06 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

It was badly battery gunked and rusty - not sure if the rust was because of the battery leak or because the machine had been damp at some point. The battery case was beyond redemption so I've removed it and will fully replace that. Also the battery lead connecter PCB header had corroded so I've repl...
by simonm
Sun Apr 28, 2019 1:03 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Ok so with the £10 machine up and running and mostly reassembled I thought I'd take a look at the other £83 one. It's an A310 again, with an IFEL ARM3 upgrade, RISC OS 3 ROMs, and an IFEL 4 podule upgrade and various podules. Not sure how much RAM yet. 2019-04-22 01.08.46.jpg 2019-04-22 01.08.54.jpg...
by simonm
Sat Apr 27, 2019 10:20 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Lucky me - the tantalums arrived in the post today, so I replaced C37, and now the 12V line is all fine. The fan now works (which is easily louder than the PSU chirping so I'm not going to fuss about that anymore) and I should probably replace C38 and C39, but maybe I'll do those another day. 2019-0...
by simonm
Sat Apr 27, 2019 1:49 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

JonC wrote:
Sat Apr 27, 2019 1:35 pm
I'm probably going to need some of these soon, which did you order?
I got this one Jon: https://www.amazon.co.uk/gp/product/B00HJUDHV8/
There's cheaper ones on ebay, but I didn't want to wait! :D
by simonm
Sat Apr 27, 2019 12:28 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Had to buy a 9 pin to 15 pin VGA adapter, but Amazon delivered early this morning so I hooked it up to my Benq and.... It lives! [-o< :D RISC OS 3.10 and 4Mb RAM. 2019-04-27 12.19.36.jpg I've some tantalums in the post so I will fix that cap next week. I've noticed that the PSU is quite "chatty" ie....
by simonm
Fri Apr 26, 2019 2:20 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Re-reading your post Kazzie, I can see you were referring to the board on the PCB now. Apologies entirely my misunderstanding,
by simonm
Fri Apr 26, 2019 1:38 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Rather than being a podule, it is (if I read corectly) a plug-in for the ROM sockets on the mainboard, which provides larger sockets for the larger RISC OS 3 ROMs, with flying leads soldered to the board for the extra address pins of the larger ROM. I think the picture might have been misleading - ...
by simonm
Fri Apr 26, 2019 11:27 am
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

This is one of the most common faults for the A310. See here for more information: https://www.retro-kit.co.uk/page.cfm/content/Common-faults-on-the-Acorn-Archimedes/#decouplingcap If the other A310 does boot it is probaly still a good idea to replace this tantalum cap (C37). Aha, thank you! Also, ...
by simonm
Fri Apr 26, 2019 3:37 am
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Wow - thanks Steve. That made a difference - getting 5V on the red/black lines now, and a speaker pulse. Holding down delete on boot gives me a beep! I have hope again! :D
I also tested the disconnected yellow line and there's 12V there too now, plus the molex is also delivering 12V + 5V.
by simonm
Fri Apr 26, 2019 1:07 am
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

I re-installed the mother board and PSU tonight, and thought I'd try giving it a powerup whirl, to see if I might hear a soothing bootup beep... 2019-04-26 01.03.23.jpg Sadly.... nothing. I heard two small "tink" "tink" sounds from PSU in short succession at first, since then just a quiet repetitive...
by simonm
Fri Apr 26, 2019 1:00 am
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Amazing what rubbish you find! These were folded up and stashed under the motherboard???!! #-o
2019-04-22 14.10.44.jpg
2018-09-02 18.24.38.jpg
by simonm
Fri Apr 26, 2019 12:57 am
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Next up, I cleaned the PCB over the bank holiday with IPA and a brush. Came up nice!
2019-04-22 13.52.01.jpg
From this...
2019-04-22 13.52.12.jpg
2019-04-22 15.15.13.jpg
To this! :)
2019-04-22 13.52.29.jpg
by simonm
Fri Apr 26, 2019 12:54 am
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

Since this is the one that popped with magic smoke I tackled the PSU recap. Bought a kit from Mark @ RetroClinic and some of the 470uF caps from ebay. My initial forays to open up the PSU started out here: https://stardot.org.uk/forums/viewtopic.php?f=16&t=9112&start=30#p214763 2018-11-27 20.20.12.j...
by simonm
Fri Apr 26, 2019 12:45 am
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

Re: A310 restoration

So I stripped down the £10 one first. It was pretty dirty inside. 2018-07-20 15.18.33.jpg 2018-07-20 15.19.36.jpg 2018-09-02 14.32.07.jpg 2018-09-02 14.36.02.jpg 2018-09-22 22.46.48.jpg 2018-09-22 22.57.02.jpg 2018-09-22 22.57.47.jpg 2018-09-22 23.06.58.jpg Has a standard two podule expansion, 1 pod...
by simonm
Mon Apr 22, 2019 1:26 pm
Forum: 32-bit acorn hardware
Topic: A310 restoration
Replies: 110
Views: 6516

A310 restoration

I've been tinkering on and off with a couple of cheap A310's I bought with the idea of advancing my hardware skills using a couple of "guinea pig" machines that aren't ones I'm too worried about mashing up. That said, my aim is to restore them (ideally both) to a working condition again, but i have ...
by simonm
Mon Apr 22, 2019 11:36 am
Forum: 32-bit acorn hardware
Topic: Arm 3 Upgrade..... what Socket do I need
Replies: 6
Views: 1591

Re: Arm 3 Upgrade..... what Socket do I need

Thanks Daniel!
by simonm
Mon Apr 22, 2019 2:34 am
Forum: 32-bit acorn hardware
Topic: Arm 3 Upgrade..... what Socket do I need
Replies: 6
Views: 1591

Re: Arm 3 Upgrade..... what Socket do I need

Thought I'd add a question to this thread since it is sort of related. What is the best way to remove an ARM chip from the socket? I'm not very hardware familiar and don't want to break anything. I have two A310's, one with an ARM3 daughterboard and one with the regular ARM chip, which I want to swa...
by simonm
Sun Apr 21, 2019 4:03 pm
Forum: 32-bit acorn hardware
Topic: Can I use a 44 Pin DOM on a 40 pin Acorn IDE?
Replies: 2
Views: 335

Can I use a 44 Pin DOM on a 40 pin Acorn IDE?

I bought a 512Mb IDE DOM device, but didn't notice it was a 44 pin one until it arrived. Is there a way to adapt it to work on the 40 pin IDE interfaces in an Archimedes? (I have A3010 candidate machines for it, one with HCCS IDE and one with Castle IDE). Was thinking about buying a molex adapter/ex...

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