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Here's a high res photo taken by a BBC Micro. Great fun!
Paul.

I can come to both days!

Paul.

Amazing, thanks for these. That makes sense. I might grab a pencil snd draw out the circuit if I find the time, although, at the very least, it's documented.

Cheers,

Paul.

And to finish, here is a close up of the circuit board rear: Hybrid-Music-6000-Circuit-Board-Closeup.jpg And some shots of the sensor: Hybrid-Music-6000-Sensor-Part-Front.jpg Hybrid-Music-6000-Sensor-Part-Back.jpg Not sure if the bubble wrap is designed to hold the sensor front in place, or serves s...

The Music 6000 Circuit Board The circuit board has a few supporting components, and: - TL851CN - SONAR RANGING CONTROL Datasheet - https://www.ti.com/lit/ds/symlink/tl851.pdf?HQS=dis-mous-null-mousermode-dsf-pf-null-wwe&ts=1691919954989&ref_url=https%253A%252F%252Fwww.mouser.co.uk%252F Desig...

Following a chat, I was reminded that I acquired a Hybrid Music 6000 a number of years back, and aside from an outing to a RISC OS London Show, it's been stored with my Hybrid box, waiting for me to set up my retro space. As such, I promised to non-destructively dissect it and share the electronic m...

I can imagine that's so frustrating. Make sure you find ways to enjoy the things you love. Sorry about your stroke. Best wishes, Paul.

I can be there on 29th

Paul

dudleysoft71 wrote: ↑Sun Apr 16, 2023 5:21 pm I think I left my jacket hanging on the back of my chair when I left. I was in a bit of a rush to get off because dinner was delayed, so I didn't check before I left. If you have seen it or picked it up then let me know via PM.

Found it. I'll take it and post it to you!

Anyone missing a black coat?

Just the Sunday for me, sadly I've got a work event on Friday and Saturday.

Cheers, Paul.

The A5000 is remembering the config, but the clock reverts to whatever it was last set to in !Alarm. I need to check back over the capacitor / crystal with a scope to see what's occurring on power and off.

Subject to a nice long test, we are nearly there..! Thanks IanJeffray. There was a little track damage between the negative battery terminal and the via leading to R301. A little repair wire about 1 cm long later on the underside and we're now getting 1.24v across 4 and 8. I thought I'd checked ever...

Thank you for the ideas. Saving the config is a good idea, although I'm specifically keen to resolve the underlying issue and nurse the machine back to full health. My config consists of 5 commands, monitor type, sync, mode, and 2 zidefs commands. My AK85 monitor shows a blank screen until then. The...

Thanks, I'll check the diode!

An odd one here, but I think I know the answer. Having fixed an A5000 by confirming power, I2C and battery charging / supply, it now works with a power on delete, or power cycle. Otherwise, settings become scrambled. What it doesn't do, is remember anything after a few hours. Battery power is fine p...

Thanks IanJeffray. Yes, IanS pointed that to me. I scanned lightly through it yesterday. The descriptions seem quite helpful in interpreting meanings. Now I've done the POST code and Memory interpretation (subject to testing and feedback!), I'll go read that A540 service manual before adding more.

The A5000 I've got in front of me (which needs some TLC around the CMOS) acts very oddly and generally inconsistently because of that fault.
Sometimes I get stretched interlaced visuals, sometimes it looks healthier, but I still have a long list of unplugged. Time to do some more reading!

Paul.

Next step: Philpem: Watch out as this part of the test changes on RISC OS 3.50+. It does two or four RAM Bank tests then gives a memory size summary. I can't remember if it's in decimal or hex. Another one which might benefit from special handling is "PC Style I/O Detected" This should app...

OK I've written a method to find the Memory readout from the POST output, and then resolve it into something easier to read. We can use this method on any part of the output, so I just need to determine more human readable values for the other POST readouts. Give me time and I'll work through some m...

I've added it to the top post, but here's the fork with the POST descriptions added. Its version 1, so there's a few things I want to return back to the original code, and a few bits to tidy (code wise), but it works (happy for any feedback to the contrary!). https://github.com/verifie/acorn_postbox...

Interesting thought there - I think key resources, e.g. waveforms may need to be hosted online anyway, and indeed that would make it useful to the wider community. However there's no need / I don't want to replace Paul-V's Retro-Kit.co.uk effort which is well resourced / functional. Certainly a few ...

Perfect, thanks DanielJ and 1024MAK. Nothing like me to try entering a room quietly, is there? :lol: Good, now it's all in one place, and away from other very different and useful threads, I'd love to hear any feedback / ideas. I'm learning my way through the code, and the next thing maybe is to sha...

It's funny, I certainly thought this needed to be moved over to the POST Thread. I'll do that now.

Thanks for the help so far!

Thanks Ian. You are right, it is just a 'friendly description' repetition of the above technical description. Although im comfortable with soldering, using a scope and other tools, as well as some coding and use of these machines, I'm still learning how the heart of riscos and acorn machines beat so...

Following on from the impressive and excellent work done on getting an incredibly useful POST Box system together by other expert stardotters, and also following a chat with IanS at Abug in January 2023, the idea to expand the software to show the POST Error. Forked version, with HEX description rea...

Power swap was my first fear, but I checked the connectors and they were correct and in spec. I'll check that machine again shortly (no pun intended or hoped for!) Once I've figured out what's going on, I'll ask very kindly for a VidC :D but only when I know the board won't fry that one up too! I've...

That's very detailed, thank you. We're the A5000s made with leaded solder? I've often found the lead free stuff needs a high temperature to work with and is generally a bit horrible. Ive got a few non Acorn boards i can practice on. My hot air station came with a range of nozzles, but none like the ...

Hi Ian,

What temperature do you set your hot air rework station to when removing ics and particularly memory chips?

Paul.

I'll bring my greaseweazle kit for 5 1/4 and 3 1/2. We'll test drives first.