stepping machanism of Apple Disk ][ drive (was Re: Heatkit 51 /4

From: Philip.Belben_at_pgen.com <(Philip.Belben_at_pgen.com)>
Date: Wed Apr 14 11:45:10 1999

>> > Then there was the Tektronix 'almost 6800' used in the 4052, etc. It was
>> > a board of 2901's, etc and ran an instruction set that was almost upwards
>> > compatible with the 6800 used in the 4051 (IIRC the DAA instruction was
>>
>> The moto 6800 was protoed using 2901s. It would only need two.
>
> The Tektronix used 4 2901's and was actually a 16 bit processor (for
> address calculations, etc). Just that user data was only calculated using
> 2 of the chips ;-)

Hey, Tony, why the winking smiley? That's no joke, it's really true! Four
2901s and a lovely 16bit architecture, and then they go and implement a 6800 on
it. :-( :-( :-(

Philip.
Received on Wed Apr 14 1999 - 11:45:10 BST