8595 / 9595 Ports LPT is standard parallel port  COM DB25 serial port capable of 345K

8595 / 9595 Operator Panel

Jim Shorney
   During my LED adventures poking around a bad 95 planar, I decided to investigate the mysterious J4, since it's right next to the operator panel connector anyway.  Seems it was an easy target.  The outer two pins are connected to ground.  The center pin is tied to operator panel 
connector pin 29 "-Remote power-on request". 

Jim, I followed that pin out a while back. So it goes to remote power on. OK. What, praytell, is the importance of your find? 

Tim Clarke
    Well, doesn't it sound as though he's determined that J4 is the "Wake-On..." header? So, do you just apply 5V for electronic-triggered power-on? 

Um, hadn't thought of that... 

From the Godfather-
   Seriously: the 8595 planar is stage 3 and does not support the stage 4 "synchrostream mode", which is turned off then. It supports the normal 64-bits burst mode with up to 40MB/s. So a Type 4 platform will be significantly slower in an old 8595-type planar than in a Server 95A planar (the one with the two serial and two parallel ports). The systemboard controller on the "single-LPT" planars does not return the proper values on trying to start up the synchro-stream - therefore it is not used. The only advantage left over is the faster CPU and higher calculation data throughput - and the ability to run Pentium software (if required). The overall performance is of course higher compared with e.g. the DX-50 platform - but it does not even come close to the values achieved with the same processor card in the 9595A "double LPT"-planar. At least not in a cumulated / weighted application which includes combined calculation and I/O traffic loads. 
   For information again: The "small" 9595s model -xLx (Type 2) and -xMx (Type 3) had the old planar - all others usually had the 9595A-planar (Type 4 -xNx, -xPx, -xQx). 

Editor's Note: Checked a -xKx and -xMx planar. Same chipset, same oscillator values. Only difference was some SMD oscillators replaced metal ones. A few less logic chips. And the -xLx, -xMx planars are a lovely green.