[Coco] Superboard discussion: Serial EEPROM
mmarlett at isd.net
Mon May 3 11:22:02 EDT 2004
At 09:57 AM 5/3/2004 -0500, you wrote:
Darn software guys...... The "SuperBoard Rev 1.0 (Serial #0001)" would be
nice but it would require a different .pof file for each SuperBoard and
chew up a ton of the CPLD. Not something I would want to maintain.
We could VERY easily add a register that would be a byte or two wide that
could handle configuration, options data and SB presence info.
>On May 3, 2004, at 9:40 AM, Bob wrote:
>>So, next question, and possibly one for a new sub-topic... how does a 3rd
>>program detect the Superboard? and the installed options? Perhaps another
>>in the EEPROM with a bit for each option (would the unused 2 bits be
>>enough?)... just thinking out loud.
>Probably the easiest and most sure-fired way to detect the presence of the
>SuperBoard would be to reserve an address in the $FF1X or $FF3X region
>which when POKEd, would return data about the board. For instance:
>Would return 'S'. Then...
>Would return 'u'....
>And so on and so forth. The value POKEd into $FF3F would correspond to
>the position in the string where the character would be returned on the
>next read. We could also embed serial number information this way. So a
>maximum of 256 characters could be stored this way. Such a string could be:
>SuperBoard Rev 1.0 (Serial #0001)
>Of course, when POKING and PEEKING on a non SuperBoard CoCo 3, you would
>likely NOT get an S, u, etc... so you could immediately detect the
>presence of a SuperBoard.
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>Coco at maltedmedia.com
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