Re: Connector P2 on 2040/4040 mainboard?

Am 18.06.2019 um 19:08 schrieb Ethan Dicks:
> Hi, All,
> 
> Some recent postings on one of the CBM groups on Facebook has turned
> my attention back to a bit of hardware I bought more than 30 years
> ago, a bare 2040/4040 mainboard.  I've been looking over the
> schematics on zimmers.net in pub/cbm/schematics/drives/old/4040 and
> there's a scan glitch on one of the pin assignments for P2, the 20-pin
> connector that goes to the analog board.
> 
> Here's the pinout as I've collected from the three digital board
> schematic sheets:
> 
> P2
>  1 ?
>  2 HD SEL 1
>  3 -MTR0
>  4 WP0
>  5 ACT LED 0
>  6 WP1
>  7 -MTR1
>  8 ACT LED 1
>  9 S1B
> 10 ?
> 11 ?
> 12 ?
> 13 ?
> 14 DATA OUT
> 15 DATA IN
> 16 ?
> 17 S0A
> 18 S0B
> 19 S1A
> 20 ?
> 
> and a loose tag at the lower left corner of 320806-3.gif
> ? READ INHIBIT
> 
> The scan glitch is I can't clearly read what pin is READ INHIBIT.  It
> could be pin 16 if the 1 is totally missing and the 6 has a void
> through it.

Reading this today, I remebered scans from various CBM drive schematics
I made some time ago. I uploaded them to zimmers.net right now.


-- 
Christian Dirks
Toast_r_at_Idealine.info