Re: How much of a ][ is needed to twitch?

[Tristan Mumford <xtristan.xmumford@xgmail.xcom>]

bieling@terra.es wrote:

-snip-

>> I'd imagine that Michaels hypothesis is the correct one - that the
>> hardware reset pulse in the original Apple ][ is too short. It's
>> possible that later revisions of the mainboard corrected the problem,
>> since there were after all several versions, and it's an easy change
>> to make.
>>
>> Matt
> 
> The disk II controller generates a 0.1 second power-up reset.
> MLBs from rev1 and up generate a 0.3 second power-up reset.
> Rev 0 boards do not generate a power-up reset at all.
> "The controller generated reset was neccesary to achieve autostart
> capability" (for rev 0 boards).
> (James Fielding, Understanding the Apple II, page 9-13)
> 
> Jorge.

very interesting indeed. While we're on the subject of the Disk ii, an
someone point me to a good guide on it? Or at very least tell me whether
the control signals between disk ][ card and floppy drive are active high
or active low?

-- 
-----> http://members.dodo.com.au/~izabellion1/tristan/index.html <-----
=====       It's not pretty, it's not great, but it is mine.       =====