Need Older PDP-8/I Schematics - test-drb@ccmp.vtda.org

26 Aug 2012

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  From: Vincent Slyngstad <vrs at msn.com>
 Date: Sun, 26 Aug 2012 02:00:35 -0700
 Subject: Re: Need Older PDP-8/I Schematics

 We are debugging an interrupt problem with the PDP-8/I at the RICM.
 Today we found that the INT RQST signal is not routed through the M117
 module in slot F11 as shown on page 7 in the
 PDP8-I_CPU_blueprints_1969.pdf.

 Does anyone have a set of prints where page 7 is older than revision L? 

 Yes.  I have a schematic in which INT_RQST goes to F21D1, F_SET goes to F21E1, and the
result from F21F1 goes to the flip-flop at E33J1.

 The ECO added KEY_LAEXDEP_L to the NAND, which required the M117 instead
 of the M113.

 The PDF is called "dec-8i-hr2a-d-pr (PDP8i Schematics -- OLD).pdf" on my box,
but I'm not sure where I got it.

 Ah.  I found it here:
 http://pdp-8.org/scans/highgate/pdp8i-docs/dec-8i-hr2a-d-pr.pdf

 Hope that helps!

    Vince 
Perfect. Thanks!
-- 
Michael Thompson