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Pin 5 of IC10 is connected to Pin 18 of IC2. Pin 6 of IC10 and Pin 19 of IC2 are connected to LK15, which is not made (which is what my circuit diagram suggests should be the case). For reference, this is the signal on IC2 Pin 18: 6314D61A-25C0-4329-BAE8-187DFE3038B0.jpeg Edit: I’ve gone a bit furth...

Okay, small progress. As IanS surmised, I was counting from the wrong end of SK7. :oops: When I looked at the real pin 16, it was reading 0V and no continuity to the 5V pin on the motherboard. One replaced socket, and the keyboard now lights up and the various lock keys glow brighter when reset is p...

Yeah, I meant 16 as well. :roll: It definitely only reads 0.3-0.6V, and it seems to be an issue local to SK7. Other areas that should be 5V read the 4.8V that the psu’s supplying. Since the other pins that should read 0V read the same 0.3-0.6, presumably something’s shorting that 5V supply yo ground...

As there's no battery, I believe the CMOS is reset each time the Arc is when switched off (allowing a little time for the capacitor to lose its charge). Are there any upgrades to the A3000, like an ARM3 or a VIDC enhancer? I found that my RAM upgrade card needed reseating to eliminate my start-up f...

Well spotted. Even close-up it looked intact, but was in fact bad. Pin 29 on IOC now starts low, then changes to high after a second or two, so that’s an improvement. The keyboard is still unresponsive and unlit. The display shows nothing, nor does it beep, but that may well be because the CMOS need...

Thanks. That was my hope originally. I forgot to say it failed. I also forgot to mention that all the keyboards look dead - not even the power LED, let alone the Caps Lock etc ones. Edit: Just tried the scope. The waveforms on LK28 and IC47 look okay (similar to those in arkleyjoe’s post). The wavef...

I’m trying to resurrect an exceedingly dead A3000, previously suffered battery damage. So far, I’ve cleaned it all up with vinegar etc. The zero-ohm links were all shot, so replaced. Same with the keyboard connectors. There are no obviously bad tracks/components left. When I fire it up, nothing. The...

I’m going to be a busy little bee... Now have bare boards for: Atom RGB to HDMI Noise killer Co-pro AtomSID YARRB (many thanks to Roland for finding a last one down the back of the sofa) Plus a massive delivery from Farnell today, and ones from Mouser et al on the way. Along with a few other machine...

Hi Boydie require a GAL16V8 I'll take one for my Atom tube interface please :) Any chance you could program it for me as well [-o< Marcus I'll set one aside. Don't know what the ETA is for them; I suspect they're coming from China. If I can program it (I believe my programmer can), I will. If I can...

These require a GAL16V8, which is now obsolete and hard to find at a reasonable price. I've managed to find a pack of 5 for not much, which are on their way now. When they arrive, and if they're good, then I'll have a few going spare...

I picked up Electron Pascal, boxed, in Oxfam back in the late 90s. Unsurprisingly, both the cartridge and manuals looked like they’d been used once at most!

Interested in Wimp Programming for All and Game Makers Manual.

The original Acorn speech upgrade came with a black plastic plate that clipped over the hole left when you removed the cutout for the cartridge slot, so the slot was covered when not in use (which was all the time, given that Acorn never made any cartridges). May be a nice thing to reproduce so it l...

Or, for thickies like me, there’s the big-print version...

https://www.exxoshost.co.uk/forum/viewtopic.php?t=593

Plenty of pictures. The only bit it won’t cover is how to make it Acorn-specific, but the wiki does that and at worst it’s a case of fiddling with the settings until it works.

I have a (not quite pristine but much better condition than yours) rear label for the cassette/video etc area, if you want to keep things as original as possible. I also have the one from the Bus Extension etc side, which may (or may not) be in better/worse condition than yours...

Thanks for the clarification; I’ll keep that in mind. As an update, Hoglet’s still got HDMI and noise eliminator boards, so one of each will be coming my way soon. :D That’ll teach me to assume that because all the order lists in the relevant threads are full there aren’t any left! So all I need now...

Thanks for the offer, but my FP socket is already occupied. If you’re working on something new I’ll bide my time and keep watching...

I'm working my way slowly through the list :) The Atom SID is good fun, and my next add-on is a Co-Pro via the Atom TUBE I/F I have a spare board of each if you're interested. Having said that I went for a the Colour/HDMI I/F, Noisekiller and a Memory Expansion before the above. Best Andy I already...

Thanks guys. I was aware of the master hardware list, but ufortunately it doesn't give much of an indicator as to what's still available. From the various threads, I could tell I'd missed out on possibly the best options, ie YARRB and HDMI boards. The alternatives seem to be Prime's boards, but agai...

Now I’ve got my atoms up and running, and have an AtoMMC (and have a birthday coming up ), I want to get them up to spec.
As far as I can tell, the essentials are:

RAM upgrade to 32k
Colour
Noise eliminator

What options are still being made/ sold for these?

Dodgy OS rom socket? If it’s anything like the quality of the speech ones...
I’ve had this a few times. With a rom in the socket, try continuity testing between the shoulders of the rom and the soldered pin on the other side on the board.

A possible solution? On the Solidisk, we know where the sideways ram banks are - banks 8 through F (although according to the manual banks 8 & 9 are typically used for shadow, if active). Hence bank F should always be present and available. Rather than have ZMMFS looking for spare ram, and finding t...

I’ve done a bit more exploring with the patched ZMMFS in eprom. It doesn’t seem to be locking up, so much as printing squares for ever more. It does respond to (CTRL) Break, and if I’m quick with CTRL-SHIFT, I can see glimpses of the usual startup banners as they flash by on the screen, as in Lines ...

Dave, Just looking at the code, do you think the subroutine PageIn12K for the Bplus would be the key to this, i.e. for a Solidisk version, everywhere the B+ version would need to page in the 12K, the Solidisk version would need to enable writing to it's own RAM bank? Apologies if this is what you’r...

So, if I understand you correctly, you’re saying that ZMMFS isn’t giving the “No sideways ram banks available” error because it can’t find any at all, but because it does find one but it’s too small and the error message is actually because the first bank it finds is too small and its copy fails? Co...

It's the 4MHz board, so they did indeed supply a 4MHz 65C02. I've now done some more playing. The patched ZMMFS that Coeus supplied won't work if it's burnt into eprom, but will work if it's loaded into sideways ram, and then hard-reset. Soft reset always makes it complain about a ROM/RAM mismatch a...

Okay, I have a "solution", for want of a better word... Having SWMMFS in the backup ROM store and copying it into SRAM from there via *Select just doesn't work, no matter what. Always gives a "Bad Sum" error. The only way to get it to work properly is: Boot with SmartSPI (or other FS) *RLOAD SWMMFS ...

It's this one...

All those screenshots look *very* familiar to me. Could this be a variant of my problem, giving a clock skewed in a slightly different way? Mine started as innocuous and became progressively more blatant as the chip failed. What happens if you leave the machine on for a few minutes, and don’t reset?...

IIRC it’s version 3.01, (c) KTAcres in 1986. I’ll upload an image whenever I get home from work (may be tomorrow morning ).
It took a considerable amount of searching to find which of the many versions actually worked with my board.