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roland wrote: ↑

Tue Nov 17, 2020 12:31 pm

If you send me your latest firmware I can also do some testing.

Absolutely. I will do this.

Lift pin 25 and tie it to pin 6 with some fine wire. Should do the job. If you PM me I'll swap a PIC with you. The new repo was work in progress and got sidelined. Approach with suspicion. I don't actually know what state it's in at the moment, other than the pin definitions are not correct. I'll lo...

You're right Dave, it is asserted in the bootloader.

Changing this in the main firmware could do the job though. From:

TRISA = 0b11011111;

to:

TRISA = 0b11001111;

might work. Ideally IRQ should be asserted ready for when the atom enables interrupts.

A file.

My development zx81 has had ~750 zxpands on and off its HASL edge connector. Now I won't pretend it's in good shape, but it still works.

The question has already been comprehensively answered but just for completeness here's a good illustrated guide.

If you have room/space, it may be worthwhile buffering the following control lines: /WR, /RD, /MREQ, /IOREQ as its always good to have nice clean control signals with reasonably fast edges. Don't forget !M1. This is needed to disambiguate IO requests and INTACK. M1 is high for IO, and LOW for INTAC...

I'm fairly certain now that the rapid solder is re-badged 'duratool' brand. The reels are identical pink. I bought a small amount to test and it's identical in use, too. Searching the bay of E for 'duratool solder wire' will get you the results

It's appreciated quite nicely since its first sale at £200...

I didn't know there were any?

Really? No idea at all?

Having had a Rapid cash account for years now I spoke to a very nice person who converted it to a credit account for me =D> The 'speak to a human' advice was top notch. Thanks for the input everyone, especially re: unleaded. I don't think I'm about to change over yet, especially since it costs way m...

Good tips, thanks!

I love the Rapid 60/40 solder. It cleans super easy with IPA, it doesn't smell and it's a joy to use. Great wetting and a lovely shine. AND NOW THEY WONT SELL IT TO ME :cry: :cry: :cry: Apparently you need to be a credit customer to be able to order it. Screenshot 2020-07-04 at 08.35.05.png I've app...

Thank you so much for uploading this. I couldn't have upgraded this 16K board to 32K without it! Also thanks to Mark @ Retroclinic for the chips

excellent! The very latest (not yet prototyped) AtoMMC board has serial broken out. This should act as a driver for me to implement something!

Very cool work Roland, very cool indeed

Because my project stack is only about 295 deep at the moment I've been thinking about things I can do with the extension header. Joystick. Networking with ESP. PS2 Keyboard. Disco lights, automated fish feeder, electric curtains might have to wait 8) :lol: The joystick is already supported. It's al...

A RAMROM/YARRB is definitely the best-of-the-best solution. It gives way more options than a bunch of individual mods. ROM paging, selectable windows in the memory map etc etc. That said, you might already have a RAM expansion and don't need the additional facilities that a modern solution will prov...

Hi Gav, I think I've fixed the issue. The latest firmware only releases the IRQ once a command has been received from the Atom. This will ensure that the IRQ is serviced no matter how fast or slow a card/Atom is. I have attached the latest build, which you can update your AtoMMC with. If you've done...

Hi all, A crystal on my issue 3 is huge. ENORMOUS. I'd like to replace it with something a little more discreet. Well both actually. In case I come to fit a RAMROM. crystaltips.jpg From my readings there are parallel and series cut crystals. They have different use cases. Referencing the Atom schema...

We're on it

I would very much like to attend please.

I've got plugs to fit the old socket but I wanted something more standard. Perhaps usb-c?

roland wrote: ↑

Wed May 13, 2020 8:16 pm

we'll end up with an Atom full of Pi Zero's: one for video, a TubePi and now also a MMC-Pi

Hi All,

Any recommendations for a replacement jack? I'd like something to drop in, using a modern style plug ideally. That funky old long connector is a pain. If anyone has a part number and supplier that would be great, thanks!

Thanks Dave!

A quick ? through the ROM's content might show commands etc but this wouldn't identify versions. I'd imagine a checksum would be the best way to positively identify a utility ROM when there is little chance of dumping it. There is a checksum algo in the manual IIRC, but I also seem to remember it's ...

I think this is a great idea. I am working actively on a new board so this would work perfectly.

OK you're most welcome to it. Just let me have your address and I'll pop it in the post for you. Can you PM yet?

Is a ] key still required? I have one. Or is it a [ ?

C