[A83] Re: ports
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[A83] Re: ports
Please note that most of this only counts for the 83-
port 00h
bit 0 \ write to the datalines of the linkport
bit 1 /
bit 2 \ read the data lines
bit 3 /
bit 4 - most significant bit indicating current rompage
bit 5 - always 0 ?
bit 6 - always 1 ?
bit 7 - always 1 ?
port 01h - keyboard
port 02h
bit 0 \ least significant bits indicating current rom page
bit 1 /
bit 2 /
bit 3 - always 1 ?
bit 4 \ used in the interrupt routine when you startup the calc
bit 5 / when set (I'm not sure) the calc resets, (probably when you take out batteries while the calc's still on.
bit 6 - always 1 ?
bit 7 - always 1 ?
port 03h - interrupt mask
bit 0 - \ indicate what code should be called
bit 1 - / during an interrupt
bit 2 - /
bit 3 - status of the ON-key being pressed or not
bit 4 - not used ?
bit 5 - not used ?
bit 6 - not used ?
bit 7 - not used ?
port 04h - ? power settings ?
port 10h - lcd instruction port
port 11h - lcd data port
port 14h - battery check
bit 0 - set when batteries are OK
bit 1 -> bit 7 - not used
> ----------------------------------------
> From: The one and only SUCKER ... <sucker_pvn@hotmail.com>
> Sent: Wed Aug 29 21:04:33 GMT+02:00 2001
> To: <assembly-83@lists.ticalc.org>
> Subject: [A83] ports
>
>
>
> Can somebody describe all the existing ports, with their
> numbers? (like: battery=?, screen=?, keyboard=?, ...)
>
> SUCKER
>
> _________________________________________________________________
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