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Looking for John Bell "82-300" (6502 board) Doc
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Author:  Mike, K8LH [ Thu Dec 31, 2015 1:30 am ]
Post subject:  Looking for John Bell "82-300" (6502 board) Doc

Greetings...

Has anyone got an electronic copy of the John Bell 82-300 board documentation, please? I'm looking for the schematic with the pin out for the 26-pin connector.

TIA...

Happy Holidays and cheerful regards, Mike

Attachments:
John Bell 82-300 Board.JPG
John Bell 82-300 Board.JPG [ 41.27 KiB | Viewed 13748 times ]

Author:  Garth [ Thu Dec 31, 2015 2:27 am ]
Post subject:  Re: Looking for John Bell "82-300" (6502 board) Doc

I haven't heard of it, but it should be pretty easy to trace it out or use a DMM. The RIOT allowed a full computer board with very few parts for its day.

Author:  Mike, K8LH [ Thu Dec 31, 2015 6:53 am ]
Post subject:  Re: Looking for John Bell "82-300" (6502 board) Doc

Hi Garth:

I don't have one of these boards so I can't really trace it out.

Cheerful regards, Mike

Author:  BigEd [ Thu Dec 31, 2015 4:29 pm ]
Post subject:  Re: Looking for John Bell "82-300" (6502 board) Doc

Probably also worth asking over at forum.6502.org

( I see now you've already found and used the thread at
http://www.vintage-computer.com/vcforum ... 31954.html
- did you mail Bigjeff there?
)

Author:  Mike, K8LH [ Thu Jul 07, 2016 4:45 am ]
Post subject:  Re: Looking for John Bell "82-300" (6502 board) Doc

Special thanks to Mike, VE3IPK, for providing a digital copy of the John Bell 82-300 schematic...

Cheerful regards, Mike

Author:  Mike, K8LH [ Sat Oct 07, 2017 7:16 pm ]
Post subject:  Re: Looking for John Bell "82-300" (6502 board) Doc

A bit late, but... my interpretation of the hand drawn schematic that accompanies the John Bell "82-300" 6502 board.

Cheerful regards, Mike

Attachments:
Bell 6502 #2.png
Bell 6502 #2.png [ 287.81 KiB | Viewed 12525 times ]

Author:  BigEd [ Sat Oct 07, 2017 8:59 pm ]
Post subject:  Re: Looking for John Bell "82-300" (6502 board) Doc

Thanks for following up!

Author:  robfinch [ Sat Oct 07, 2017 9:22 pm ]
Post subject:  Re: Looking for John Bell "82-300" (6502 board) Doc

The schematic shows A6 on the 6532 as grounded. Is this correct ? That would limit memory to 64 bytes.

Author:  Mike, K8LH [ Sat Oct 07, 2017 10:03 pm ]
Post subject:  Re: Looking for John Bell "82-300" (6502 board) Doc

Thanks, Robert. Good catch. Fixed...

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