Just bought an Atom

discussion of games, software, hardware & emulators relating to the Acorn Atom and Acorn System machines.
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Lardo Boffin
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Re: Just bought an Atom

Post by Lardo Boffin » Thu May 09, 2019 5:38 pm

roland wrote:
Thu May 09, 2019 4:45 pm
It looks all fine to me. I once had an Atom with a similar behavior and the problem was the 6502 socket. After I replaced that by a decent socket the Atom ran stable.

Is there somebody in your neighborhood with a scope so that you can check some signals? Before we start removing sockets from the board....
Sadly I am scope-less and nobody I know close-by has one.

I have a logic probe and multi-meter but thats it. :(

I have changed a number of sockets on various Sinclair computers but they were not worth enough to make my hands shake with nerves! (No Sinclair computers were hurt in the making of this statement).

I could send it off for professional prodding but that would be time and money. :?
Atom, issue 5
Elk
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
USA Model B
BBC Master, Datacentre + HDD, pi co-proc, econet, NULA

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oss003
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Re: Just bought an Atom

Post by oss003 » Thu May 09, 2019 6:43 pm

When it switches to graphics mode, can you type: P.&?#B000;?#B000=0 and see what that does?
It should print the current graphics mode and return to text mode.

Could be the 8255 because it switches to graphics mode sometimes and looks like the program runs ok.

Greetings
Kees

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Elminster
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Re: Just bought an Atom

Post by Elminster » Thu May 09, 2019 6:53 pm

Lardo Boffin wrote:
Thu May 09, 2019 5:38 pm

Sadly I am scope-less and nobody I know close-by has one.
I know someone who just bought a new one and has an old one to sell on :)

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Lardo Boffin
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Re: Just bought an Atom

Post by Lardo Boffin » Thu May 09, 2019 6:59 pm

Elminster wrote:
Thu May 09, 2019 6:53 pm
Lardo Boffin wrote:
Thu May 09, 2019 5:38 pm

Sadly I am scope-less and nobody I know close-by has one.
I know someone who just bought a new one and has an old one to sell on :)
I wonder who that might be? :lol:

What do these things go for? I am assuming they are not cheap.
Atom, issue 5
Elk
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
USA Model B
BBC Master, Datacentre + HDD, pi co-proc, econet, NULA

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Lardo Boffin
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Re: Just bought an Atom

Post by Lardo Boffin » Thu May 09, 2019 7:00 pm

oss003 wrote:
Thu May 09, 2019 6:43 pm
When it switches to graphics mode, can you type: P.&?#B000;?#B000=0 and see what that does?
It should print the current graphics mode and return to text mode.

Could be the 8255 because it switches to graphics mode sometimes and looks like the program runs ok.

Greetings
Kees
Thanks. Will try that later.
Atom, issue 5
Elk
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
USA Model B
BBC Master, Datacentre + HDD, pi co-proc, econet, NULA

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Lardo Boffin
Posts: 1838
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Re: Just bought an Atom

Post by Lardo Boffin » Thu May 09, 2019 7:26 pm

oss003 wrote:
Thu May 09, 2019 6:43 pm
When it switches to graphics mode, can you type: P.&?#B000;?#B000=0 and see what that does?
It should print the current graphics mode and return to text mode.

Could be the 8255 because it switches to graphics mode sometimes and looks like the program runs ok.

Greetings
Kees
When it went into graphics mode I typed this and got the following:-

667D1992-059A-4B8C-9E90-162A9207E0DC.jpeg
Once it printed out 30 rather than B0.

And then quickly back to this:-
0BAF4A2D-61B9-4338-9F35-AA5B696A9308.jpeg
Atom, issue 5
Elk
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
USA Model B
BBC Master, Datacentre + HDD, pi co-proc, econet, NULA

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roland
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Re: Just bought an Atom

Post by roland » Thu May 09, 2019 7:45 pm

My "bad Atom" had exactly the same problem before I changed the socket. It was related to phi2 from the Yarrb board to the Atom's main board. The #B0 value is a result of an undefined write to #B000 which can be caused by a distortion on phi2 so that there is an early write to #B000 (which is often written to for selecting a row of the keyboard matrix).

You can try and change JP4 to position 1-2, maybe that helps but I don't expect so.

Also follow the track from the Phi2 pin of the 6502 (pin 39) to somewhere on the main board (for example pin 25 of the VIA). Check if that has no bad joints or so.
FPGAtom: 512 KB RAM, Real Time Clock and 64 colours
MAN WOMAN :shock:

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Elminster
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Re: Just bought an Atom

Post by Elminster » Thu May 09, 2019 9:22 pm

Lardo Boffin wrote:
Thu May 09, 2019 6:59 pm
Elminster wrote:
Thu May 09, 2019 6:53 pm
Lardo Boffin wrote:
Thu May 09, 2019 5:38 pm

Sadly I am scope-less and nobody I know close-by has one.
I know someone who just bought a new one and has an old one to sell on :)
I wonder who that might be? :lol:

What do these things go for? I am assuming they are not cheap.
They hold there value better than my car that’s for sure. The rigol 1102e new are £300, not sure what they are secondhand, not many in UK on eBay. One went for £200 with postage in Feb. About £150 in US but get crippled on postage.

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Lardo Boffin
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Re: Just bought an Atom

Post by Lardo Boffin » Mon Jun 24, 2019 4:14 pm

Thanks to Sir Morris I now have a working Atom with a YAARB and AtoMMC! Truly an 8 bit Knight!

Is there an idiots guide to the usage of the AtoMMC anywhere on here? Thanks!


895C223D-63F7-407A-A3C1-8AE0AF4FDA31.jpeg
Atom, issue 5
Elk
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
USA Model B
BBC Master, Datacentre + HDD, pi co-proc, econet, NULA

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oss003
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Re: Just bought an Atom

Post by oss003 » Mon Jun 24, 2019 4:42 pm

There is a manual here: http://members.casema.nl/hhaydn/SD-files/atommmc2.html

@hoglet, the AtoMMC rom manual is missing in your Google Drive roms.
If you have one, can you upload it, or otherwise upload the attached pdf?
(The only disadvantage of the pdf is that there are link in it.)
Thanks.

Greetings
Kees
Attachments
AtoMMC2.pdf
(182.69 KiB) Downloaded 12 times
Last edited by oss003 on Mon Jun 24, 2019 4:43 pm, edited 1 time in total.

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anightin
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Re: Just bought an Atom

Post by anightin » Mon Jun 24, 2019 4:43 pm

I found a website here:

http://ext.acornatom.nl/storage/atommc/


... and a a few useful commands in the code:

https://github.com/hoglet67/AtoMMC2

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hoglet
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Re: Just bought an Atom

Post by hoglet » Mon Jun 24, 2019 5:32 pm

oss003 wrote:
Mon Jun 24, 2019 4:42 pm
@hoglet, the AtoMMC rom manual is missing in your Google Drive roms.
If you have one, can you upload it, or otherwise upload the attached pdf?
I've uploaded the file you attached to the ROM Manual Archive:
http://tinyurl.com/atomroms

Dave
Last edited by hoglet on Mon Jun 24, 2019 5:34 pm, edited 2 times in total.

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sirmorris
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Re: Just bought an Atom

Post by sirmorris » Mon Jun 24, 2019 5:42 pm

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

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Lardo Boffin
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Re: Just bought an Atom

Post by Lardo Boffin » Tue Jun 25, 2019 6:21 am

Thanks all. I am up and running with the rather awesome ‘Atom Software Archive’. :D
Atom, issue 5
Elk
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
USA Model B
BBC Master, Datacentre + HDD, pi co-proc, econet, NULA

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hoglet
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Re: Just bought an Atom

Post by hoglet » Tue Jun 25, 2019 8:09 am

Lardo Boffin wrote:
Tue Jun 25, 2019 6:21 am
Thanks all. I am up and running with the rather awesome ‘Atom Software Archive’. :D
Do make sure you read the help page (press the key with ? on it).

Useful capabilities include search ("S") and filtering (""6" "7" "8").

Dave

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Lardo Boffin
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Re: Just bought an Atom

Post by Lardo Boffin » Tue Jun 25, 2019 8:29 am

hoglet wrote:
Tue Jun 25, 2019 8:09 am
Lardo Boffin wrote:
Tue Jun 25, 2019 6:21 am
Thanks all. I am up and running with the rather awesome ‘Atom Software Archive’. :D
Do make sure you read the help page (press the key with ? on it).

Useful capabilities include search ("S") and filtering (""6" "7" "8").

Dave
Thanks Dave. The help would have probably saved me 5 minutes trying to change page. :D
Atom, issue 5
Elk
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
USA Model B
BBC Master, Datacentre + HDD, pi co-proc, econet, NULA

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