Search found 2109 matches

by steve3000
Thu Mar 26, 2020 11:20 pm
Forum: hardware
Topic: A3000 power on test check error
Replies: 47
Views: 1601

Re: A3000 power on test check error

I removed the ARM3 and reseated before trying again and..... That's brilliant, well done - and welcome back to your A3000 :D Thanks Steve3000 for the suggestion =D> No problem, glad to help! It was a bit of a hunch, the change in errors you were seeing just didn't add up...and your A3000 is one of ...
by steve3000
Wed Mar 25, 2020 10:03 pm
Forum: hardware
Topic: A3000 power on test check error
Replies: 47
Views: 1601

Re: A3000 power on test check error

Interesting that you’re getting a ROM checksum error. I assume you’re using original ROMs, not EPROMs? If so, these should not fail checksum. So it’s possible one or more high address line tracks are corroded to your ROMs, but I can’t help wondering if something simpler could be the issue, such as y...
by steve3000
Wed Mar 25, 2020 9:02 pm
Forum: hardware
Topic: A3000 power on test check error
Replies: 47
Views: 1601

Re: A3000 power on test check error

Great to see the ROMs worked!

As Ian says, this helps pin down to IC24.

Let us know how you get on testing connections, but also if you have a 4mb upgrade, it would be worth trying this to bypass the onboard RAM (in case the fault is IC24 itself).
by steve3000
Sat Mar 21, 2020 6:41 pm
Forum: hardware
Topic: Acorn AKF60
Replies: 2
Views: 179

Re: Acorn AKF60

Not quite the AKF60, but may help - I recall my AKF52 was a pain to open. After removing the lower back screws, I eventually determined that there were a couple of hidden clips along the top, which you could push down using a small allen key, then it simply popped open. See pic below.
DSC_0530.JPG
by steve3000
Sun Mar 15, 2020 11:28 pm
Forum: hardware
Topic: Wrecked Master Compact ADD04 base unit
Replies: 20
Views: 910

Re: Wrecked Master Compact ADD04 base unit

Might be worth checking with CJE. A couple of years back I saw they had a Master Compact second drive upgrade kit listed in stock which included a drive and the modified 2nd drive facia...
by steve3000
Tue Mar 03, 2020 11:35 pm
Forum: hardware
Topic: A3000 power on test check error
Replies: 47
Views: 1601

Re: A3000 power on test check error

yes tried the RISCOS 2 ROMs at the weekend. Just get the grey border (monochrome output so I would guess red!). No messages or supervisor prompt displayed. Just to check, did you switch the ROM links back over to the RISC OS 2 settings? I would have hoped to see at least "RISC OS 1024K" on startup ...
by steve3000
Mon Mar 02, 2020 7:54 pm
Forum: hardware
Topic: A3000 power on test check error
Replies: 47
Views: 1601

Re: A3000 power on test check error

Nice A3000, it looks very clean, certainly compared to some heavily battery damaged examples I've restored - so hopefully can make some progress here... When the self-test error is flashed out, does the computer show a red border, and change to black after it completes flashing the code? Presumably ...
by steve3000
Thu Feb 27, 2020 11:10 pm
Forum: hardware
Topic: A3000 power on test check error
Replies: 47
Views: 1601

Re: A3000 power on test check error

If RISC OS is flashing self-test codes at you, this is a good sign - most of the core bits and bobs are functioning :) If you're not getting "CMOS unreadable" as one of the codes, then the CMOS RAM chip is OK, at least as far as it will allow you to boot. But as you've replaced this, it certainly wo...
by steve3000
Sat Feb 22, 2020 8:39 am
Forum: hardware
Topic: Partially Working A4000 - Help!!
Replies: 79
Views: 8730

Re: Partially Working A4000 - Help!!

Yes, this is an enduring repair thread, well done for not giving up.

I'm still wondering about the RAM, do you have access to one of cmorely's A4000 RAM kits? With these you can bypass the onboard RAM...
by steve3000
Sat Feb 22, 2020 8:22 am
Forum: hardware
Topic: A5000 woes
Replies: 53
Views: 3517

Re: A5000 woes

Time to give the hot air station a try :D Be careful if corrosion has spread to the RAM legs, they'll be much harder to remove, and more likely to lift pads beneath. Do you have Chip Quik? This reduces the melting point of solder and helps avoid lifting pads. I now use this any time I'm removing SM...
by steve3000
Thu Feb 06, 2020 10:39 pm
Forum: hardware
Topic: A540 Help needed
Replies: 23
Views: 1198

Re: A540 Help needed

This should produce a 512kb file, which you can transfer out on a formatted DOS disc. :) Didn't DOS disk support (in the OS) come with RISC OS 3? Quite right. So to do this under RO2, you'll need !MultiFS from the PC emulator package or one of many PD DOS disc writers for RO2. If you have a RISC OS...
by steve3000
Thu Feb 06, 2020 10:35 pm
Forum: hardware
Topic: Acorn A310 help.
Replies: 17
Views: 663

Re: Acorn A310 help.

Well, things have gone from hrrmmm...to grrrr. after not getting a response form the floppy drive and the memc1a chip getting really hot it no longer has any lights on the keyboard an no response when pressing the caps lock etc. i think i need to put this down for the rest of the day and do somethi...
by steve3000
Thu Feb 06, 2020 10:26 pm
Forum: hardware
Topic: A540 Help needed
Replies: 23
Views: 1198

Re: A540 Help needed

No, the ram module Im using here was bought after I got the A540 and on this module there are no markings so I dont even know who produced it. Yes, it is running stable without the module installed. I played popolous on it and there was no Problem so far. Ah, that could explain it - some A540's wer...
by steve3000
Mon Feb 03, 2020 9:11 pm
Forum: hardware
Topic: Acorn A310 help.
Replies: 17
Views: 663

Re: Acorn A310 help.

Hi Steve3000, so the issue is the video output - either the monitor is faulty or the VIDC chip has failed. Both are possible, but if you're not getting any sound (Ctrl+G after pressing f12) then the most likely culprit is the VIDC chip. Ok thats interesting. It seems like the computer is operating ...
by steve3000
Mon Feb 03, 2020 7:40 pm
Forum: hardware
Topic: Acorn A310 help.
Replies: 17
Views: 663

Re: Acorn A310 help.

the caps lock and num lock lights turn on and off when pressed. Are you saying the caps lock can be toggled using the caps lock key? Is there a cooling fan installed and does it run? What happens if you wait a few seconds after switching on, then press F12 and then press Copy (or ctrl-g)? Try what ...
by steve3000
Sun Feb 02, 2020 9:33 pm
Forum: hardware
Topic: A540 Help needed
Replies: 23
Views: 1198

Re: A540 Help needed

Ok, great, the hand-written serial number certainly suggests this was a prototype (if the early RO2.01 and the hand-soldering on the PCB wasn't enough...) Is it stable running without a RAM card present, just on the built-in 4mb? And did the RAM card come with the computer, or did you get it separat...
by steve3000
Sun Feb 02, 2020 3:13 pm
Forum: hardware
Topic: A540 Help needed
Replies: 23
Views: 1198

Re: A540 Help needed

Oh well done! May not be the same issue, but I find that my A540 is very fussy with RAM modules changes. I suspect the contacts are a bit iffy, as it always has problems after changing RAM or CPU card, requiring several attempts to refit/reseat them before it springs into life. I notice you have the...
by steve3000
Thu Jan 30, 2020 8:04 pm
Forum: hardware
Topic: A5000 woes
Replies: 53
Views: 3517

Re: A5000 woes

Oh that is interesting to see the level of detail you get from the additional self test code... I didn't think it was any more than a simplified way for decoding the flashing floppy light, but seems much more useful! Interesting that it's hanging on the SRAM code; this is without a PCF8583 fitted at...
by steve3000
Wed Jan 29, 2020 11:28 pm
Forum: hardware
Topic: A5000 woes
Replies: 53
Views: 3517

Re: A5000 woes

Great to read your progress so far. One thought - have you tried RISC OS 2.0 ROMs or the RAM TEST ROMs? Both avoid any power on self test, ROM checksum, etc and simply assume everything is OK when attempting to boot. This has helped me get life out of some a couple of dead machines in the past, and ...
by steve3000
Wed Jan 29, 2020 11:17 pm
Forum: hardware
Topic: Open source A3020 RAM
Replies: 57
Views: 3069

Re: Open source A3020 RAM

Great to read the progress with overclocking this awesome RAM upgrade. Stable at 24MHz is amazing, especially considering the original ARM3's were spec'd at 20MHz...! I've not yet had a chance to test any overclocking using this in my A4000, as real life has got in the way of computers over the past...
by steve3000
Sun Jan 12, 2020 10:45 pm
Forum: hardware
Topic: A540 Help needed
Replies: 23
Views: 1198

Re: A540 Help needed

Definitely some damage to the PCB in the first photos, and looks like more than 2 tracks are broken? For most of those tracks under the socket, you can clearly see where the track is damaged, so double check they are showing good continuity before fitting the socket. Once the socket goes back in the...
by steve3000
Wed Oct 30, 2019 6:19 pm
Forum: hardware
Topic: 'Crazy' video output after powering on
Replies: 9
Views: 604

Re: 'Crazy' video output after powering on

... but now when I turn the computer on I get the normal colour cycle and then what appears to be the text cursor jumping around the screen a bit and then nothing, just a black screen. I removed the keyboard again and the same things still happens. This just sounds like the CMOS RAM has simply lost...
by steve3000
Sat Oct 26, 2019 8:12 am
Forum: software
Topic: RPC J233 hard disk image
Replies: 9
Views: 919

Re: RPC J233 hard disk image

This is brilliant, many thanks for compressing and uploading to dropbox!

I've downloaded to experiment with this under emulation :D
by steve3000
Mon Oct 21, 2019 10:48 pm
Forum: software
Topic: RPC J233 hard disk image
Replies: 9
Views: 919

Re: RPC J233 hard disk image

Oh, yes please! I believe the J233 was the last revision of the RiscPC actually sold by Acorn? It would be great to recreate the HDD under emulation and have a play with it.
by steve3000
Wed Oct 16, 2019 7:06 am
Forum: hardware
Topic: A5000 restoration - Floppy error 23 Fixed :)
Replies: 7
Views: 584

Re: A5000 restoration - Floppy error 23

Have you tried the second floppy drive connector, and checked the nearby links 18, 19, 21 are set correctly?

It is also not uncommon for the motor select IC (IC42) to fail it there was a lot of battery damage.
by steve3000
Sat Oct 12, 2019 12:14 pm
Forum: software
Topic: Should I Worry About Viruses Found By My RISC PC?
Replies: 3
Views: 507

Re: Should I Worry About Viruses Found By My RISC PC?

Definitely run !Killer to clean up your computers. Icon and Extend were fairly tame viruses, but very prolific - they got everywhere, and I'm sure they will be lurking on retro Acorn computer users floppies and HDDs for many years to come... But on that point, is there a formal archive of old RISC O...
by steve3000
Fri Oct 11, 2019 11:26 pm
Forum: hardware
Topic: A4 Laptop - replacement electrolytic capacitors and CMOS battery
Replies: 21
Views: 1260

Re: A4 Laptop - replacement electrolytic capacitors and CMOS battery

Interesting, if you look at the circuit diagram for the A5000, they were obviously thinking about fitting an 80C51 and using a PS/2 keyboard connector with a quadrature mouse. You can see the unpopolated pads for the 80C51 on the PCB. I wonder if they gave up on it because the found they couldn't g...
by steve3000
Fri Oct 11, 2019 10:56 pm
Forum: hardware
Topic: Formatting SD/CF cards for use on RISC OS 3.1
Replies: 120
Views: 25279

Re: Formatting SD/CF cards for use on RISC OS 3.1

And just for completeness, here it is in my A5000 :)
tn_20191011_233353.jpg
by steve3000
Fri Oct 11, 2019 9:27 pm
Forum: hardware
Topic: Formatting SD/CF cards for use on RISC OS 3.1
Replies: 120
Views: 25279

Re: Formatting SD/CF cards for use on RISC OS 3.1

Following my own guide at the start of this thread (on a RPi B+ running RISC OS 5.24 with !HForm 2.75), I get exactly as I described previously, 503mb with HForm offering me a 1024 LFAU.
tn_20191011_221325.jpg
tn_20191011_221347.jpg
by steve3000
Fri Oct 11, 2019 7:04 pm
Forum: software
Topic: WANTED: Patch for Risc PC support of Acorn's software PC Emulator (!PCEm)
Replies: 13
Views: 796

Re: WANTED: Patch for Risc PC support of Acorn's software PC Emulator (!PCEm)

Does Alt-Break also exit PCem single tasking, or is that just for the podule PC card?