Search found 801 matches

by sirmorris
Tue Nov 17, 2020 3:48 pm
Forum: acorn atom and acorn system series
Topic: New AtoMMC board: V4
Replies: 57
Views: 1633

Re: New AtoMMC board: V4

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.
by sirmorris
Tue Nov 17, 2020 11:44 am
Forum: acorn atom and acorn system series
Topic: New AtoMMC board: V4
Replies: 57
Views: 1633

Re: New AtoMMC board: V4

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...
by sirmorris
Mon Nov 16, 2020 12:19 pm
Forum: acorn atom and acorn system series
Topic: New AtoMMC board: V4
Replies: 57
Views: 1633

Re: New AtoMMC board: V4

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.
by sirmorris
Mon Nov 16, 2020 9:51 am
Forum: acorn atom and acorn system series
Topic: New AtoMMC board: V4
Replies: 57
Views: 1633

Re: New AtoMMC board: V4

A file.
by sirmorris
Wed Oct 21, 2020 11:57 am
Forum: 8-bit acorn hardware
Topic: Hard Gold or Enig Finish for Edge Connector Fingers
Replies: 11
Views: 249

Re: Hard Gold or Enig Finish for Edge Connector Fingers

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.
by sirmorris
Tue Oct 06, 2020 1:05 pm
Forum: 8-bit acorn hardware
Topic: Music 500/5000 cable question
Replies: 16
Views: 563

Re: Music 500/5000 cable question

The question has already been comprehensively answered but just for completeness here's a good illustrated guide.
by sirmorris
Mon Oct 05, 2020 11:25 am
Forum: other vintage hardware, software and languages
Topic: Jupiter Ace Expansion Bus
Replies: 18
Views: 909

Re: Jupiter Ace Expansion Bus

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...
by sirmorris
Fri Aug 28, 2020 9:56 am
Forum: off-topic
Topic: Rapid not selling 60/40 to general punters anymore?
Replies: 24
Views: 1674

Re: Rapid not selling 60/40 to general punters anymore?

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 8)
by sirmorris
Sat Aug 08, 2020 11:51 am
Forum: for sale / freebies
Topic: Black Atom
Replies: 5
Views: 498

Re: Black Atom

8)
by sirmorris
Tue Aug 04, 2020 7:58 pm
Forum: for sale / freebies
Topic: Black Atom
Replies: 5
Views: 498

Re: Black Atom

It's appreciated quite nicely since its first sale at £200...
by sirmorris
Tue Aug 04, 2020 7:44 pm
Forum: for sale / freebies
Topic: Black Atom
Replies: 5
Views: 498

Re: Black Atom

I didn't know there were any?
Really? No idea at all?
:lol: :lol: :lol:
by sirmorris
Mon Jul 06, 2020 1:26 pm
Forum: off-topic
Topic: Rapid not selling 60/40 to general punters anymore?
Replies: 24
Views: 1674

Re: Rapid not selling 60/40 to general punters anymore?

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...
by sirmorris
Sat Jul 04, 2020 8:39 am
Forum: off-topic
Topic: Rapid not selling 60/40 to general punters anymore?
Replies: 24
Views: 1674

Rapid not selling 60/40 to general punters anymore?

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...
by sirmorris
Fri Jul 03, 2020 8:22 pm
Forum: acorn atom and acorn system series
Topic: TimeData MZ163 User manual and schematic
Replies: 2
Views: 951

Re: TimeData MZ163 User manual and schematic

Thank you so much for uploading this. I couldn't have upgraded this 16K board to 32K without it! 8) Also thanks to Mark @ Retroclinic for the chips =D>
IMG_20200703_200538.jpg
by sirmorris
Sat May 30, 2020 3:51 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC extensions
Replies: 8
Views: 743

Re: AtoMMC extensions

:shock: 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 8)
by sirmorris
Sat May 30, 2020 12:02 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC extensions
Replies: 8
Views: 743

AtoMMC extensions

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...
by sirmorris
Sat May 30, 2020 11:43 am
Forum: acorn atom and acorn system series
Topic: Expanding the Atom with more memory
Replies: 4
Views: 502

Re: Expanding the Atom with more memory

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...
by sirmorris
Sat May 23, 2020 11:31 am
Forum: acorn atom and acorn system series
Topic: Odd reset/Atom MMC behaviour
Replies: 5
Views: 634

Re: Odd reset/Atom MMC behaviour

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...
by sirmorris
Sat May 23, 2020 11:18 am
Forum: acorn atom and acorn system series
Topic: Crystal replacement
Replies: 5
Views: 509

Crystal replacement

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...
by sirmorris
Sat May 23, 2020 10:23 am
Forum: acorn atom and acorn system series
Topic: AtoMMC2 help needed
Replies: 4
Views: 453

Re: AtoMMC2 help needed

We're on it 8)
by sirmorris
Wed May 20, 2020 12:22 pm
Forum: acorn atom and acorn system series
Topic: Replacement power jack for Atom
Replies: 6
Views: 692

Re: Replacement power jack for Atom

I've got plugs to fit the old socket but I wanted something more standard. Perhaps usb-c? :lol: 8)
by sirmorris
Wed May 20, 2020 11:44 am
Forum: acorn atom and acorn system series
Topic: AtoMMC2 RPi
Replies: 24
Views: 1746

Re: AtoMMC2 RPi

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 :lol:
:cry:
by sirmorris
Mon May 18, 2020 11:34 am
Forum: acorn atom and acorn system series
Topic: Replacement power jack for Atom
Replies: 6
Views: 692

Replacement power jack for Atom

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!
by sirmorris
Sat Feb 15, 2020 11:35 am
Forum: acorn atom and acorn system series
Topic: Unknown utility ROM - how to identify w/o dumping?
Replies: 4
Views: 697

Unknown utility ROM - how to identify w/o dumping?

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 ...
by sirmorris
Mon Nov 18, 2019 12:42 pm
Forum: acorn atom and acorn system series
Topic: W65C02S6TPG-14 and AtoMMC (split from YARRB [SOLD OUT])
Replies: 25
Views: 1693

Re: W65C02S6TPG-14 and AtoMMC (split from YARRB [SOLD OUT])

I think this is a great idea. I am working actively on a new board so this would work perfectly.
by sirmorris
Wed Sep 11, 2019 8:52 pm
Forum: wanted
Topic: Wanted: Atom key posts / ] key
Replies: 30
Views: 2563

Re: Wanted: Atom key posts / ] key

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?
by sirmorris
Mon Sep 09, 2019 8:35 pm
Forum: wanted
Topic: Wanted: Atom key posts / ] key
Replies: 30
Views: 2563

Re: Wanted: Atom key posts / ] key

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

C

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