Re: Plus/4 Parallel Port I/O question

From: William Levak (wlevak_at_cyberspace.org)
Date: 2000-07-24 06:01:49

On Sun, 23 Jul 2000, Larry Anderson wrote:

> PIN  DESC:
>  B   Parallel Data Line bit 0
>  K   Parallel Data Line bit 1
>  4   Parallel Data Line bit 2 (also 'cassette sense', unplug datasette
> before use)
>  5   Parallel Data Line bit 3   
>  6   Parallel Data Line bit 4
>  7   Parallel Data Line bit 5
>  J   Parallel Data Line bit 6
>  F   Parallel Data Line bit 7

That agrees with the schematics.

> and the 'address' for the port is 64784 ($FD10)
> 
> but I cannot find an entry for the cooresponding Data Direction Register
> which assigns the bits as input or output....  :/  

There isn't one.  This is a 6529 single port interface (data sheet on
funet).  When you read that address, all 8 data lines are read.  When you
write, all 8 data lines are written.

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