//c+ switch settings, QWERTY/Dvorak (was Re: IIc+ mouse `A+ Little

From: Patrick Finnegan <pat_at_purdueriots.com>
Date: Fri Aug 30 13:13:00 2002

On Fri, 30 Aug 2002, Sellam Ismail wrote:

> This is the same way the TransWarp accelerator works on my Apple //e. You
> press ESC when it's booting (the TransWarp has control of the system first
> and fades in the "TransWarp" logo, during which time you can hit the key)
> and it boots under regular speed (which is to say it hands control to the
> mainboard 6502, whereas normally it takes control of the system with it's
> on-board accelerated 6502).

OK, now I've never gotten to play with one of these. How exactly does it
hijack the system like this? Does it use some software trick to halt the
motherboard proc, or is there a bus line that lets it grab control, like
the /LOCK line* that's on an 80x86?

It'd be interesting to design a different replacement processor for the
system, maybe even some sort of ICE based that uses a (cheap, old) PC for
control.

* I have never used this in practice, but from reading about the processor
I believe this is what it does (allows a peripheral to steal the processor
bus).

-- Pat
Received on Fri Aug 30 2002 - 13:13:00 BST