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Good news, the command you advised to get the HD back worked, I can now see the Apps on the bottom left like I could 18 years ago :). I have also finished cleaning the motherboard and it looks a lot better now. The only things I need to fix now is the mouse. I have already opened it up, and I'd say...

I have done some cleaning with White Vinegar/half water already, but not with the toothbrush. I didn't think that sorting the IC58 area would be necessary now that I have a podule with the CMOS chip. Saying that, could I completely remove the old CMOS chip now that it's out of action? Since the upp...

Hello (and welcome to the forum! - you might want to say hello in the introductions thread). Great to hear you've rescued an A5000, hopefully things aren't as bad as you think for the hard disc. First thing to remember with these old computers is that if you fit a new CMOS RAM chip, all settings wil...

Ah, yes, an AKF60 would certainly explain the issue! :wink: But no harm done and at least you got to the bottom of it, while learning more about your A305. :D Unfortunately the AKF60 isn't great for early Archies, it was sold with the first RiscPCs, and fits better with their graphics capabilities. ...

I suspect that it is not the original PSU - it's a switched mode one (now recapped after it stank out the study). I would have thought that an Issue 2 would have still used the linear PSU. (it is both frustrating and enticing that a lot of the version history of the Beeb appears to be 'fuzzy'). Iss...

These aren't the same as CM8833, because these are multiscan and (should) accept any horizontal frequency from 15khz to 38khz. The CM8833 only accepts 15khz. The AKF65 supports the higher horizontal frequencies 25khz and above I believe, but won't work for games at 15khz... It's interesting that onl...

I followed the instructions (I'm actually using a USB IDE adapter plugged into the IDE CF adapter I use in my Arc) and it all worked first time! 512MB card formatted as 503MB, can copy files to it on the real machine. Happy days! Great you've had success :) Now two minor issues to work through - RI...

BigEd wrote: ↑

Tue Aug 07, 2018 7:20 pm

A bit later than that, I've just found the R140 from 1989 with a floating point coprocessor (at least as an option?)

Ah that's right and makes sense that it came as an option for the RISCiX computers.

First coprocessor was at launch of A440 in 1987/88 I think? It was on a podule card, with full access to address bus via the A440's podule backplane. Later Archie's didn't have this.

Both right sort of. Came in with Arm3 in 1989, and with Arm250 in 1992...

C37 going short has been cause of three dead A310's that I've repaired. It only causes the PSU to trip, so easy repair by pulling the capacitor, but good idea to change while you have everything out

Great to see you back Paul, and nice selfie!

Not sure about the effect of three years continuous use of a CUB monitor, but as Mark says, it's the switching on/off which places most stress on these, so hopefully it'll be good for many more years.

Lots of good advice there from Paul, so it's great to see you've had success! Well guess what? You were both right! The settings I'm using are as follows: sync 0 monitortype 1 mode 20 Does mode 12 display correctly too? If so, games should work without problems. And another good test would of course...

I think I've managed to piece together some information. Next to the RGB monitor connector are two "links" - LK10 and LK11. It seems that these were hardwired at the factory but could be populated with headers and then changed with standard jumper connections to allow future proofing. You don't (sh...

LCDGameModes probably won't help on the AKF50, and may make things worse as it was not intended to be used on CRT screens... But if you want to try you'll need monitortype set to 4 to try it.

AKF50 should work as monitortype 0... It does for me :) It should also display games correctly in monitortype 1...at least mine does...on an A5000. Difference with an A305, like all earlier Archimedes, is that there is no monitor ID circuitry present, so RISC OS 3 guesses what sync and type...and us...

It had a cardboard box with it, so went for something astronomical, over 500 I think...?

RISC PC prototype https://www.ebay.co.uk/itm/PROTOTYPE-Acorn-RISC-PC-600-Working-with-PC-Emulator-Strong-ARM-CPU/132716934855?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D51875%26meid%3Db231128895bd47a9b89d2a3483a06fce%26pid%3D100005%26rk%3D1%26rkt%3D12%26sd%3D202225599020%26itm%3D13271...

Yes they have 32kb ROM sockets. But I've not tired sideways RAM in my US beeb, mainly because it's stopped working :( I suspect it would be possible to get working, but the location any flying leads pick up signals from would be different - although this shouldn't be difficult to work out for sidewa...

The above (*configure changing the 'live' screen mode set) is real hardware behaviour, I used it frequently in the past when developing LCDGameModes.

Why not ask the vendor for the part number? I have an identical looking disc which came with my Brother's Archimedes A310 (I think he got it for Christmas in 1987). The part number on it is 0277,020. Well... I did. They're 0277,020 and 0276,020. The seller also agreed to ship to me in the US. So I ...

Nice work! It's another thing to add to my list of "things I need to fix ArcEm to work with". Thanks Jeffrey! I'd love to see this working under emulation one day :) Let me know if you get round to tweaking ArcEm and need any specific test cases. The Symposium '96 intro also does "interesting" thin...

With a few minor tweaks such as branching to the IRQ/FIQ code in the Module, instead of copying it into the FIQ area, I think it might run on a Pi under ADFFS - I've not figured a way to handle code in Page Zero yet. Admittedly there's no reason to run RasterMan on a Pi, other than the technical ch...

I've just tried this on my A3000. It's very impressive to watch!! Amazing to see this machine display palettes like this on screen for the first time (as far as I know!). I look forward to trying (and failing) to understand some of the source code when you release it. Hey thanks, glad you like it! ...

Hey, thanks Mark. I'm planning on taking a look this weekend, will have the soldering iron on standby

Yes, just behind the RGB socket, Paulv's website shows how his modern VIDC fits in an A310, here: https://www.retro-kit.co.uk/Ultra-VIDC-Enhancer/ Enhancers from back in the day plug in the same location, but look older ;) But even without an enhancer you can usual get some sort of picture, providin...

Yikes, sorry to hear about your A4000 PSU. Glad the main PCB is ok though. I don't recall seeing the schematic for the A4000 PSU in the TRM (the A3010/A3020 on-PCB PSUs are shown, but not sure these would be useful) although it's been a while since I looked so could be wrong. I never got round to fu...

Well there's a blast from the past! Not much to report I'm afraid. I ordered the replacement CMOS RAM chip, but it took a few weeks to arrive, then my wife gave birth and this computer got rapidly packed away into the loft. I later picked up a fully functional A5000 from a friend so had no urgent ne...

Just a quick note that my 'RasterMan' v0.16b technical demo and RISC OS programmer's interface (Raster Manager Module) for the Archimedes are available to download at the link below, and to view on YouTube. Some of you many recall the technical demo was first shown at the Wakefield Acorn show in May...

This is great - enjoyed the demo and equally enjoying reading your write up so far, can't wait for the rest :D ! Some really great techniques there and I love the dithering approach - which looks amazing on my slightly blurry CRT. The use of vertical rupture combined with ordered dithering is awesom...