Re: Help: info needed for 9-007-001 SVA Apple Disk Controller

[mdj <mdj.mdj@gmail.com>]

On Sep 25, 3:35 pm, "Michael J. Mahon" <mjma...@aol.com> wrote:

> >> That's almost as nasty as the code that WOZ wrote for the original
> >> Apple parallel printer card. Instead of reading a handshaking line
> >> through a data register, his code used that line to change the
> >> addressing on the card's ROM. In one state it was an endless loop, in
> >> the other state, it processed the data.
>
> > That's essentially the same as the Megaflex (or, actually, the Megaflex
> > is the same as Woz's since his came first).  The Megaflex used static
> > RAM to run the on-board code.  I can't remember if there was a boot ROM
> > or not.  Will have to dig it out one of these days.
>
> And note the similarity to the way the Disk ][ Controller state machine
> works by using the read data line as an address bit.
>
> After all, "State machines is state machines."

Not a nasty hack at all - "Simplicity is the ultimate sophistication"

Matt