Search found 1837 matches

by steve3000
Wed Jan 03, 2018 6:53 pm
Forum: hardware
Topic: Think I'm loosing my (beeb) memory
Replies: 22
Views: 830

Re: Think I'm loosing my (beeb) memory

After 2 hours of Exile running without a problem, I switched the computer off and on, and the screen was back full of '$$$$'s as before. Clearing the screen or changing MODE gradually improved the display, with '$$$$'s slowly disappearing with each CLS... Sometimes the computer would behave normally...
by steve3000
Tue Jan 02, 2018 6:06 pm
Forum: hardware
Topic: Think I'm loosing my (beeb) memory
Replies: 22
Views: 830

Re: Think I'm loosing my (beeb) memory

Interesting thought, yes, a short between address and data could certainly explain this... however I've just tested continuity between pins 13 and 14, and there's no indication of a short. Also interesting, the effect now seems to be intermittent. Always there on start-up (at the moment) but sometim...
by steve3000
Mon Jan 01, 2018 9:55 pm
Forum: hardware
Topic: Think I'm loosing my (beeb) memory
Replies: 22
Views: 830

Re: Think I'm loosing my (beeb) memory

Great work guys! Here's a picture of MODE7 on start up, note the pattern of 64 "$"s then 64 " "s. 20180101_210937.png Clearly it should be saying "Acorn TUBE 65C102 Co-Processor" etc. but if bit 2 was set on, you get "Egovn$TUFE$65G546$Go-Tvogewwov" - almost what you see above, but the last 6 charac...
by steve3000
Mon Jan 01, 2018 8:12 pm
Forum: hardware
Topic: Think I'm loosing my (beeb) memory
Replies: 22
Views: 830

Re: Think I'm loosing my (beeb) memory

In MODE 7 I see blocks of $$$$$ signs in some places where it should be black, suggesting certain bits are fixed 'on' in the upper 16k bank of RAM? Will post a photo later.
by steve3000
Mon Jan 01, 2018 5:27 pm
Forum: hardware
Topic: Think I'm loosing my (beeb) memory
Replies: 22
Views: 830

Think I'm loosing my (beeb) memory

I need some help tracking down the cause of a sudden memory problem which occurred today on my Issue 7 Beeb. I hadn't used my Beeb for a few months, and powered it up today to enjoy some 8 bit action before I have to return to work tomorrow... All was going well until I noticed the screen seemed to ...
by steve3000
Sun Dec 31, 2017 11:55 pm
Forum: hardware
Topic: RISC PC (Issue 1) will not play nice with any Podules (apart from a NIC in the NIC slot)
Replies: 2
Views: 371

Re: RISC PC (Issue 1) will not play nice with any Podules (apart from a NIC in the NIC slot)

Track damage (assuming you had battery leakage at sombre point?) or a dirty/corroded socket. I had the same from a RiscPC which I repaired a few years ago - I suspect the podule is being detected but it's ROM loader code isn't passing checksum after making it across to the computer. For me it was qu...
by steve3000
Sat Dec 30, 2017 12:49 am
Forum: for sale / freebies
Topic: Upgraded A310 and software bundle for sale
Replies: 11
Views: 1088

Re: Upgraded A310 and software bundle for sale

That looks like a really high spec genuine A310 in original condition, with a nice software package too. I'm sure it would make a great system for an Archimedes enthusiast or beginner wanting to take a first step into retro 32bit Acorn computing! Looking at your photos, you should also mention that ...
by steve3000
Tue Dec 05, 2017 7:34 am
Forum: hardware
Topic: Switchable/dynamic/expanded RISC OS
Replies: 25
Views: 1302

Re: Switchable/dynamic/expanded RISC OS

Has anyone, ever, put a 4Mbyte ROM set in an Archimedes, or heard of anyone ever doing it? Yes, I've done it (which is why I was suggesting this on the other thread :)) LA21 is present at the sockets on the A540 and latter (mostly selected via a link), so that's the A540, A5000, A4, A3010, A3020, A...
by steve3000
Tue Dec 05, 2017 1:04 am
Forum: hardware
Topic: Switchable/dynamic/expanded RISC OS
Replies: 25
Views: 1302

Re: Switchable/dynamic/expanded RISC OS

Thinking more about this especially considering the above discussion, and the fact that going larger than current RISC OS 3 ROMs, while OK for most Archimedes computers, won't be universally easy as some early computers will need modifications - I'm definitely leaning towards two project approach. (...
by steve3000
Tue Dec 05, 2017 12:44 am
Forum: software
Topic: Roll your own RISC OS 3.1x
Replies: 3
Views: 1214

Re: Roll your own RISC OS 3.1x

Ooh very nice :)

Do the build tools include calculating the ROM checksums and a tool to generate 'striped' 8 bit or 16 bit ROM image files for burning? (The later is simple to write if not...)
by steve3000
Sun Dec 03, 2017 6:14 pm
Forum: for sale / freebies
Topic: New Aneng AN8000 Digital multimeter £10 posted UK
Replies: 1
Views: 339

New Aneng AN8000 Digital multimeter £10 posted UK

As per the title. I accidentally ordered two of these rather neat, entry-level digital multimeters, due to a slight ebay ordering mix up. So here's my spare one for sale. 20171203_151349.jpg Supplied as in picture, all brand new, just needs 2 x AAA batteries. £10 incl. UK postage, if paid by paypal ...
by steve3000
Sun Dec 03, 2017 5:26 pm
Forum: hardware
Topic: RISC OS 3.20 ROM's?
Replies: 120
Views: 6144

Re: RISC OS 3.20 ROM's?

Good point. I ordered some 27C160's from futurlec.com last year and they're still listing them as available now. reichelt.com also lists them as available, but 31-41 day delivery suggests shipping from China. But yes, the more mainstream suppliers don't seem to list these, so would need to confirm a...
by steve3000
Sun Dec 03, 2017 3:46 pm
Forum: hardware
Topic: RISC OS 3.20 ROM's?
Replies: 120
Views: 6144

Re: RISC OS 3.20 ROM's?

Really interesting topic! Great work so far Jon, Jeffrey and all. Considering the squeeze on space trying to fit within the original 2mb RISC OS 3 ROM size, I think this could be a opportunity to use a larger EPROM and create a 4mb RISC OS 3.2. I looked into this very briefly a while back, but never...
by steve3000
Mon Nov 20, 2017 10:11 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2612
Views: 215504

Re: Worth Taking a Look At

Thanks for the hint with the two jumpers to set. But it still remains the same, no reaktion, power led goes on and thats it. Do the keyboard lights come on/off? What happens when pressing reset? What i have recognicsed is, that there is no real serial number on the machine, only handwriting on the ...
by steve3000
Mon Nov 20, 2017 9:38 pm
Forum: wanted
Topic: Adapter and device that reliably produce Disc Error 23
Replies: 14
Views: 861

Re: Adapter and device that reliably produce Disc Error 23

I would have thought it's specific to the adaptor as that's what implements the interface, however I have a few SD cards I can try over the next few days... I've certainly seen this behaviour from some of the SD adaptors I have, as I've also seen Disc Error 23, but I can't be sure I ever carried ou...
by steve3000
Mon Nov 20, 2017 9:23 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2612
Views: 215504

Re: Worth Taking a Look At

Hi! I'm the one who bought this strange A540 with the eproms that have Markes by hand. The problem is, the machine had seriously battery leaking problems and is not booting up. Dead :cry: As Ian says, the pictures show that this A540 has had some previous expansions (most likely a genlock or colour...
by steve3000
Thu Nov 16, 2017 12:54 pm
Forum: hardware
Topic: A5000 Disc Error 21
Replies: 2
Views: 364

Re: A5000 Disc Error 21

If you don't hear the usual spin up and heads engaging noise at startup then this is likely to be a failing drive, but first double check everything, especially that the cable is correctly inserted and not shifted along by one row of pins. I've had a few drives from 90s computers fail. It is possibl...
by steve3000
Sun Nov 12, 2017 9:08 am
Forum: wanted
Topic: Adapter and device that reliably produce Disc Error 23
Replies: 14
Views: 861

Re: Adapter and device that reliably produce Disc Error 23

Hi Jon, I have SD-> IDE adaptors which consistently produce disc error 23 when connected to an A5000. I don't know if they do the same on a RiscPC though (if this is what you're working on?). The adaptors all have a single IC with ST368 and/or Sintechi written on them, and are currently what you rec...
by steve3000
Mon Nov 06, 2017 12:10 am
Forum: hardware
Topic: Another A5000 restoration....
Replies: 10
Views: 816

Re: Another A5000 restoration....

Well done for getting so far! It's easy to give up on these and I know from experience they can be really frustrating at times. I repaired an A5000 with faulty floppy drive in the past, cause was IC42 in that case, but I'm sure the symptoms were different to yours. I vaguely recall the drive was det...
by steve3000
Sun Nov 05, 2017 10:13 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2612
Views: 215504

Re: Worth Taking a Look At

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

d.
The connector that plugs into the motherboard is on the other side.
Also the A540 backplane, at least mine, is incredibly flimsy, flexing at the slightest pressure... Whereas my A5000 backplane is much more sturdy. :)
by steve3000
Sun Nov 05, 2017 9:39 am
Forum: hardware
Topic: Issue 1 BBC, how to tell ?
Replies: 12
Views: 556

Re: Issue 1 BBC, how to tell ?

...I have an Issue 2 Beeb . Are you counting that as one of the two issue 2's... That does ring a bell, my issue 2 is well into the fake tan category, but looks like an original model B. I know of two more issue 2's still in use, so a fair few must have made it out into the wild at the time. Love P...
by steve3000
Sun Nov 05, 2017 8:40 am
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2612
Views: 215504

Re: Worth Taking a Look At

Interesting! So whoever paid out for that A540 may have an early example with possibly a pre-release version of RISC OS 2.01... (unless of course the scribbled date is American format... unlikely though) Not sure this was the driver for the high price, as RO2.01 only added the two extra VIDC clocks,...
by steve3000
Sat Nov 04, 2017 7:49 am
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2612
Views: 215504

Re: Worth Taking a Look At

A well used (and fairly battered looking) 4mb A540 base unit on eBay right now - only few hours left: https://www.ebay.co.uk/itm/Acorn-Archimedes-A540/202096335398?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649 What interests me is the ROMs - labelled "FOX" and dated 8/3/90, which seems ...
by steve3000
Fri Nov 03, 2017 9:52 pm
Forum: hardware
Topic: A310 - late production or relabelled A4x0/1?
Replies: 4
Views: 427

Re: A310 - late production or relabelled A4x0/1?

geraldholdsworth wrote:A similar sort of thing could have happened here (considering that the seller also has a 310 without a label on).
Good spot. Or maybe he just swapped the labels of a A4x0 with his A310...for fun?
by steve3000
Mon Oct 23, 2017 8:55 pm
Forum: hardware
Topic: A5000 IDE interface just died... what to try next?
Replies: 19
Views: 1306

Re: A5000 IDE interface just died... what to try next?

There seems to be a guy on ebay selling 82C711s at the moment. I don't remember what the difference was between the '710 and the '711 though or whether the two parts are footprint-compatible. Interesting find! If you mean item #172883263746, the IC in the picture definitely isn't pin compatible (wr...
by steve3000
Sun Oct 22, 2017 11:14 pm
Forum: hardware
Topic: A5000 IDE interface just died... what to try next?
Replies: 19
Views: 1306

Re: A5000 IDE interface just died... what to try next?

Well, I'm stumped. I cleaned up the PCB and looked for damage. I couldn't find anything, all the tracks looked undamaged, so today soldered the new battery in. Everything works fine battery-wise, but the it's still not noticing the IDE drive. Question - does your computer detect a floppy drive, and...
by steve3000
Fri Oct 20, 2017 8:26 pm
Forum: hardware
Topic: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!
Replies: 69
Views: 5881

Re: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!

sirbod wrote: The source has a 30 sec timeout for reads, so is it actually waiting 30 seconds before reporting the error?
Yes, at least 30 seconds. It felt like longer, but maybe I was impatient, or possibly it tries more than once...?
by steve3000
Thu Oct 19, 2017 10:39 pm
Forum: hardware
Topic: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!
Replies: 69
Views: 5881

Re: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!

:cry: Bad news Jon - I've tried tonight on my CF cards and 'new' SD->IDE adaptor under RISC OS 3.1 on my A4000 and A5000 - and both still fail to read under your modified ADFS. See pics below from my A4000, fitted with a 2Gb CF card formatted to 500Mb and confirmed working fine with Wizzo IDEFS and ...
by steve3000
Thu Oct 19, 2017 4:08 am
Forum: hardware
Topic: 10base-2 crossover?
Replies: 77
Views: 3676

Re: 10base-2 crossover?

I can't do the A3010 HDD mod as it's an Adelaide not an ARM250! That doesn't stop you doing the HDD modification, in fact it should be slightly easier, as the Adelaide board pins are easier to solder onto... The important ide controller IC24 (82c711) is still present, so you 'just' need to tap into...
by steve3000
Mon Oct 16, 2017 5:35 pm
Forum: hardware
Topic: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!
Replies: 69
Views: 5881

Re: ICS Wizzo IDEFS for A5000/A4 (+A3020/A4000...) improves CF card support!

Brilliant work Jon! I'm currently away from home, but have plenty of SD card adaptors and CF cards which fail with ADFS, so will happily spend some time testing later this week. Wizzo solved CF cards, but not the SD adaptors that I have, so it will be intesting to see how these function with your fi...