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| From: TLC (all posts)
Date: 2001-05-05
Subject: Re: Question about SIDCARD schematics/ports
|
Hi!
Peter Trauner írta:
>
> Hallo,
>
> does somebody know the exact behaviour of the
> sidcard's IO or have the schematics handy.
There's a GAL (or PAL for the earlier versions) on the card for address decoding.
The SID maps to both $fd40 and $fe80, otherwise nothing special. Also, IIRC there is a 74LS245 that is used as joystick port, its CS is also generated by the GAL somehow (the base address must be somewhere at the end of the SID register map, maybe base+$1f? I don't remember).
As to the sch, I guess the author (Christian Schäffner) has never published it.
Best regards,
Levente
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