Search found 776 matches

by sirmorris
Sat Feb 15, 2020 11:35 am
Forum: acorn atom and system
Topic: Unknown utility ROM - how to identify w/o dumping?
Replies: 4
Views: 212

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 system
Topic: W65C02S6TPG-14 and AtoMMC (split from YARRB [SOLD OUT])
Replies: 25
Views: 785

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 7:52 pm
Forum: wanted
Topic: Wanted: Atom key posts / ] key
Replies: 30
Views: 1411

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 7:35 pm
Forum: wanted
Topic: Wanted: Atom key posts / ] key
Replies: 30
Views: 1411

Re: Wanted: Atom key posts / ] key

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

C
by sirmorris
Mon Jun 24, 2019 5:42 pm
Forum: acorn atom and system
Topic: Just bought an Atom
Replies: 75
Views: 4243

Re: Just bought an Atom

The version online is very old and incomplete, there is a much more up-to-date version here:

https://github.com/charlierobson/atommc ... ine-Manual
by sirmorris
Fri Jun 14, 2019 6:14 am
Forum: acorn atom and system
Topic: 2AtomFPGA - successor of Yarrb
Replies: 17
Views: 820

Re: 2AtomFPGA - successor of Yarrb

What's the socket for? EEPROM? It all sounds quite exciting Roland!
by sirmorris
Fri Jun 14, 2019 6:10 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 851
Views: 50892

Re: RGB to HDMI using a Pi Zero and a small CPLD

If you need a spectrum edge connector I can sort you out.
by sirmorris
Wed Jun 12, 2019 9:58 am
Forum: acorn atom and system
Topic: YARRB [SOLD OUT]
Replies: 275
Views: 19260

Re: YARRB

I am curious what really caused the problems. Are you willing to figure that out by for example comparing the most critical signals at the good and the bad ic's? I suspect that one or all are marginal in some parameter or other. I'm no detective though, and wouldn't know where to begin with an anal...
by sirmorris
Tue Jun 11, 2019 7:31 pm
Forum: acorn atom and system
Topic: YARRB [SOLD OUT]
Replies: 275
Views: 19260

Re: YARRB

I suspected the 8255 as occasional flips into graphics mode could be explained by it. And indeed changing it out has solved the problems. Ctrl-G now sings beautifully :lol: It was still glitchy though so I set about swapping out chips and the 3 clock related bods around IC44 were my best educated gu...
by sirmorris
Tue Jun 11, 2019 12:48 pm
Forum: acorn atom and system
Topic: YARRB [SOLD OUT]
Replies: 275
Views: 19260

Re: YARRB

@Dace* - I've tried a couple of AtoMMC boards and they behave the same so I don't think it's a mechanical issue, but thanks for the suggestion. Further to that I undid the YARRB mods and swapped in my RAMROM and lo, the machine works perfectly. I can reliably run every program in the collection, the...
by sirmorris
Tue Jun 11, 2019 10:50 am
Forum: acorn atom and system
Topic: YARRB [SOLD OUT]
Replies: 275
Views: 19260

Re: YARRB

So after much probing and messing around I'm still a little stumped. I've checked jumper positions and clock waveforms and I'm happy they're in spec. No IRQ jumper is present. It's an R6502. I've changed the LS04 clock conditioner for a new chip even though the scope showed some nice clean signals. ...
by sirmorris
Sat Jun 08, 2019 10:56 am
Forum: acorn atom and system
Topic: YARRB [SOLD OUT]
Replies: 275
Views: 19260

Re: YARRB

So weirdness continues. This morning I thought I'd get some measuring done and lo, the machine is (almost) behaving itself. I've done nothing, it's in the same state I left it. But I get a (mostly) stable boot, ability to load the menu from SD card, and even run some of the software. I've written a ...
by sirmorris
Fri Jun 07, 2019 2:14 pm
Forum: acorn atom and system
Topic: YARRB [SOLD OUT]
Replies: 275
Views: 19260

Re: YARRB

Hi everyone. As another data point I've currently got a machine on the bench which is showing instability when YARRB is installed. I haven't yet reverted the machine to a pre-YARRB configuration but that's on the cards. The machine was post renovation and said to be working when I received it, but I...
by sirmorris
Thu May 16, 2019 7:53 am
Forum: acorn atom and system
Topic: Atom Econet Adapters
Replies: 7
Views: 672

Re: Atom Econet Adapters

Go for it!
by sirmorris
Tue Apr 16, 2019 2:27 pm
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 135
Views: 9641

Re: Raspberry Pi to 1MHz bus interface

Peripheralmon. Gotta catch them all...

Is there a PCB I could buy please?
by sirmorris
Sat Apr 13, 2019 9:52 pm
Forum: acorn atom and system
Topic: Finally got an Atom
Replies: 19
Views: 1104

Re: Finally got an Atom

Nice ;)
by sirmorris
Sat Apr 13, 2019 2:15 pm
Forum: acorn atom and system
Topic: Atom Video to HDMI Adapter
Replies: 236
Views: 12131

Re: Atom Video to HDMI Adapter

Yes please Dave!
by sirmorris
Thu Mar 07, 2019 10:47 am
Forum: hardware
Topic: Beeb 1MHz Bus FPGA Adaptor
Replies: 149
Views: 7763

Re: Beeb 1MHz Bus FPGA Adaptor

I'd like a board please Dave. I'll be happy to solder the smd bits for anyone unwilling.
by sirmorris
Tue Mar 05, 2019 11:58 am
Forum: acorn atom and system
Topic: System Clone design files....
Replies: 8
Views: 995

Re: System Clone design files....

Beautiful work as always, Phill!
by sirmorris
Sun Jan 13, 2019 2:49 pm
Forum: acorn atom and system
Topic: Atom Colour Board Thread
Replies: 236
Views: 37798

Re: Atom Colour Board Thread

Beautiful work as always, Phill!
by sirmorris
Sun Dec 30, 2018 5:54 pm
Forum: acorn atom and system
Topic: Atom Disk manager
Replies: 8
Views: 571

Re: Atom Disk manager

32? what is this number?
by sirmorris
Sun Dec 30, 2018 5:53 pm
Forum: acorn atom and system
Topic: Where to buy the AtoMMC(2)?
Replies: 3
Views: 442

Re: Where to buy the AtoMMC(2)?

charlie_robson@hotmail.com

You don't even have to be nice.

:lol:
by sirmorris
Sun Dec 02, 2018 10:50 pm
Forum: software: classic games
Topic: what should i write next?
Replies: 204
Views: 21132

Re: what should i write next?

Flicky.

Not only because it's a great game but also ...
by sirmorris
Wed Oct 24, 2018 5:39 pm
Forum: acorn atom and system
Topic: Relocating the AtoMMC2 in the Atom...
Replies: 25
Views: 2743

Re: Relocating the AtoMMC2 in the Atom...

^ what Phill said :D
by sirmorris
Wed Oct 24, 2018 7:43 am
Forum: acorn atom and system
Topic: Relocating the AtoMMC2 in the Atom...
Replies: 25
Views: 2743

Re: Relocating the AtoMMC2 in the Atom...

Is that an issue 3 board Richard?
by sirmorris
Tue Oct 23, 2018 7:34 am
Forum: other vintage computer hardware, software and games
Topic: Fixing the Grundy NewBrains
Replies: 7
Views: 780

Re: Fixing the Grundy NewBrains

Samtec do a range of pre-made cables. Check out their range and if you find anything suitable let me know and I may be able to get one for you.

Would something like this do?

https://www.samtec.com/products/idms
by sirmorris
Fri Oct 19, 2018 11:14 am
Forum: introduce yourself
Topic: New Atom Member
Replies: 29
Views: 1530

Re: New Atom Member

I have a few spare keys - you might get lucky and not need to cannibalise the iss.3. Like Dave says - there's no Atom that can't be fixed.
by sirmorris
Fri Oct 19, 2018 9:38 am
Forum: introduce yourself
Topic: New Atom Member
Replies: 29
Views: 1530

Re: New Atom Member

Yup.