Re: Switchless ROMs

From: smf <smf_at_null.net>
Date: Mon, 26 Dec 2016 23:13:58 +0000
Message-ID: <c04b1cb9-a734-197b-5045-d94e0f90e313@null.net>
On 26/12/2016 22:51, Michał Pleban wrote:
> If you accept this limitation, then you actually don't need any magic
> sequence at all. You just boot into the menu, the user selects the
> KERNAL from the menu, then a single read from e.g. $E0xx selects the
> KERNAL and disables further selections.

You do need to guarantee that your bank switch register powers up in the 
correct state. Which might be a little tricky with only the standard rom 
signals.

But yeah if you're only allowing a switch in your special kernel then 
you don't need any magic sequences, but I quite like the idea of being 
able to switch. It would for example allow you to create a kernel that 
has both tape and jiffydos routines in, with automatic switching between 
the two 8k images.

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Received on 2016-12-27 00:00:02

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