Search found 20 matches

by cjm
Tue Jun 30, 2020 5:57 pm
Forum: acorn atom and acorn system series
Topic: Yarrb - redesigned
Replies: 213
Views: 8604

Re: Yarrb - redesigned

roland wrote:
Sun Oct 06, 2019 12:06 pm
Edit: I attached the user manual to this post to make it easier to find.
Thanks - that's very useful!
by cjm
Tue Jun 30, 2020 4:17 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC2 RPi
Replies: 24
Views: 952

Re: AtoMMC2 RPi

Hi Folks, I now have a custom signal converter - which makes connecting the pi to PL8 on the Atom a lot neater. This provides access to D0-D7, A0-A2, NRST, 1MHz, NB400 and R/NW on the Atom using the same GPIO pins as the PiTubeDirect. In addition A3 is available on BCM pin 5 of the GPIO connector. S...
by cjm
Sat Jun 27, 2020 10:08 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC2 RPi
Replies: 24
Views: 952

Re: AtoMMC2 RPi

My Atom now has a noise killer - a great improvement.
by cjm
Sun Jun 07, 2020 7:27 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC2 RPi
Replies: 24
Views: 952

Re: AtoMMC2 RPi

Just ordered a noise killer PCB
by cjm
Sun Jun 07, 2020 5:43 pm
Forum: wanted
Topic: Wanted: Atom video noise killer
Replies: 8
Views: 589

Re: Wanted: Atom video noise killer

Sorry for missing this thread. I still have a few blank PCBs for the Atom 8K Video RAM and Noise Killer: IMG_1675.JPG This board replaces all the existing video RAM with a single low power 8K RAM and adds the noise killer circuit. The blank boards are £5 plus postage. There are no surface mount com...
by cjm
Sat Jun 06, 2020 9:44 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC2 RPi
Replies: 24
Views: 952

Re: AtoMMC2 RPi

daveejhitchins wrote:
Sat Jun 06, 2020 6:38 am
cjm wrote:
Fri Jun 05, 2020 10:42 pm
https://www.youtube.com/watch?v=G1Rj6dqXuKM QED :D
Who needs a noise-killer then? . . . .

Dave H :D
Me! :D
And some colour.
And another 2k of RAM above the standard Atom 6K graphics ram (to run AGD games I think!?)
by cjm
Sat Jun 06, 2020 9:39 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC2 RPi
Replies: 24
Views: 952

Re: AtoMMC2 RPi

Great ..... in AGD games you can select JoyMMC as input for the PORTB AtoMMC joystick. Greetings Kees I can select the JoyMMC however AGD games lock up shortly after this. I'm trying via the software archive menu and also... *CWD AGD/AEON1 *A1RUN I have 6K video RAM and it looks like AGD expects 8K...
by cjm
Fri Jun 05, 2020 10:42 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC2 RPi
Replies: 24
Views: 952

Re: AtoMMC2 RPi

roland wrote:
Thu Jun 04, 2020 9:07 pm
cjm wrote:
Thu Jun 04, 2020 5:50 pm
Thanks - that fixed it. Now playing Chuckie Egg on the Atom with a PlayStation controller.
Prove it! Pictures please :mrgreen: Another modern device connected to our beloved Atom :lol:
https://www.youtube.com/watch?v=G1Rj6dqXuKM QED :D
by cjm
Thu Jun 04, 2020 5:50 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC2 RPi
Replies: 24
Views: 952

Re: AtoMMC2 RPi

hoglet wrote:
Thu Jun 04, 2020 2:47 pm
I thought it worked the other way around.
Thanks - that fixed it. Now playing Chuckie Egg on the Atom with a PlayStation controller.
by cjm
Thu Jun 04, 2020 2:37 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC2 RPi
Replies: 24
Views: 952

Re: AtoMMC2 RPi

I now have a USB game controller controlling the PORTB values. I assume that a 1 indicates an active state such as button press. It works with the JOYTEST program - are there any games that respond to the MMC joystick?
by cjm
Wed Jun 03, 2020 8:35 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC2 RPi
Replies: 24
Views: 952

Re: AtoMMC2 RPi

Thanks oss!
by cjm
Wed Jun 03, 2020 5:25 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC2 RPi
Replies: 24
Views: 952

Re: AtoMMC2 RPi

Do you have any plans to make the software available, so other people can have a play? Here's the first reasonable version of the MMC-Pi software. I have tried to keep the changes to the existing AtoMMC code to a bare minimum. Apart from running on a RPi the other main change is that it uses a late...
by cjm
Wed May 13, 2020 9:17 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC2 RPi
Replies: 24
Views: 952

Re: AtoMMC2 RPi

Multiwizard wrote:
Wed May 13, 2020 8:31 pm
cjm wrote:
Wed May 13, 2020 8:09 pm
A lot of the software archive seems to work. Although some seems to need hardware I don't have (for example a "SID" - what is a SID?).
A video from Kees (oss003) & his AtomSID:

https://www.youtube.com/watch?v=iKX0m24BEwk&t=40s


Greetings, Wim... :-)
That is awesome!
by cjm
Wed May 13, 2020 8:38 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC2 RPi
Replies: 24
Views: 952

Re: AtoMMC2 RPi

The RPi software is a modified version of the PIC AtoMMC2 software and uses a dedicated core to emulate the PIC parallel slave port for connecting to the Atom. It runs on the Circle bare metal programming environment https://github.com/rsta2/circle . I will put a tidied up copy of the source on gith...
by cjm
Wed May 13, 2020 8:09 pm
Forum: acorn atom and acorn system series
Topic: AtoMMC2 RPi
Replies: 24
Views: 952

AtoMMC2 RPi

Hello Folks, I have been investigating whether it is possible to emulate an AtoMMC using a Raspberry Pi. The setup is a standard Atom with a YARRB board containing the AtoMMC2 s/w A RetroClinic PiTubeDirect level shifter provides the hardware interface between the GPIO on the Pi and the PL8 connecto...
by cjm
Thu Mar 26, 2020 7:45 pm
Forum: acorn atom and acorn system series
Topic: My old Atom for you to see
Replies: 10
Views: 931

Re: My old Atom for you to see

roland wrote:
Sun Mar 22, 2020 2:42 pm
I already contacted Chris by email, he will receive his Yarrb board within a few days.
I have received my Yarrb board, it's up and running 8) - thank you
by cjm
Thu Mar 26, 2020 9:19 am
Forum: acorn atom and acorn system series
Topic: Yarrb - redesigned
Replies: 213
Views: 8604

Re: Yarrb - redesigned

My Yarrb arrived - connected and working. Pin 10 on IC44 managed to connect to the side of the socket and resulted in a mournful ctrl-g sound - my fault - I just needed to bend it a bit more. The Atom is now busy calculating the first 100 digits of pi using BBC basic - I need an AtoMMC now! Many tha...
by cjm
Mon Mar 09, 2020 5:30 pm
Forum: acorn atom and acorn system series
Topic: My old Atom for you to see
Replies: 10
Views: 931

Re: My old Atom for you to see

(Apologies for hijacking this thread but I can't send a PM)

Where can I obtain an AtoMMC and a yarrb board for my atom?

Kind regards
by cjm
Tue Mar 03, 2020 2:06 pm
Forum: introduce yourself
Topic: Hello
Replies: 6
Views: 400

Hello

I've just dusted off my second Acorn Atom, bought for £80+VAT in a sale from Technomatic, Edgware Road in 1983. I built my first Atom from the kit but it has long since expired. I have sourced a 5v SMPS and Atom number 2 still works - what a wonderful machine! Now I would like to expand the memory a...

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