Emax

Just try it, add the scsi connector and see what's good.   You could also 
just test it with an internal scsi drive and a ribbon cable with an extra 
connector, instead of drilling.

I think the display board should be fine, what do the capacitors connect?  
it's all data so I don't think there should be much trouble.

Good find!!

I am just guessing here, but check your power supply voltages, and if they 
are off or wobbly see if the emax II PSU can be temp swapped.

they should be very similar since it is the last emax I version.

>From: "esynthesist" <esynthesist@...>
>Reply-To: emax@yahoogroups.com
>To: emax@yahoogroups.com
>Subject: [emax] Repair and SCSI Upgrade question
>Date: Sat, 16 Sep 2006 17:26:57 -0000
>
>I need some help !
>
>I bought the Emax Plus Rack I was talking about earlier. It's a "Plus
>SE with SCSI", serial number 002 (!).
>The sampler works but it has a display problem and quite a strange
>SCSI chipset:
>
>
>1. The DISPLAY Problem
>----------------------
>
>First of all this machine has a problem with the LCD display.
>After pushing some buttons, the contrast on the second line goes to
>zero and the contrast on the first line goes to the maximum.
>There's also an annoying high frequency noise coming from the main
>board (invertor ?) and also from the display (this only when the
>problem occurs)
>
>Now I also have a spare Emax-II rack with a perfectly working
>frontpanel PCB board & display.
>I compared the two boards and they look almost the same:
>- board in Emax Plus = 'Emax Rackpanel version 2 1986' PC328 REV B
>ASSY REV A (AF133)
>- board in Emax II   = 'Emax Rackpanel version 2 1986' PC328 REV D
>(no assy)  (AF133)
>The two capacitors on the board however have different numbers -
>these are actually the only two components on the board which are not
>buttons, sliders, display, lights or chip :-)
>
>My question:
>Do you think it's safe to switch these boards ? Maybe it won't work,
>that's no problem, but I just want to be sure the Emax Plus won't get
>damaged by this experiment.
>Anyone who can give me some advice ???
>
>
>2. The STRANGE Thing
>--------------------
>
>I also want to add an external SCSI port to the sampler. It's not
>fitted on the board, and there's no hole in the backpanel either.
>Now I checked the specs from the sampler:
>- it's a PC333 Rev B main board
>- the SCSI 5380 chip is installed on IC6
>- the IP379A HD/Plus TIM PAL chip is installed on IC49
>...
>- but on IC13 there's a 24-pin IP349C chip instead of the IP355
>mentioned on www.emulatorarchive.com.
>However, it is installed on an 28-pin socket. There's also an IP349
>Rev 3 'piggyback' board installed at the left of the main PC333.
>
>This is a situation not described in the SCSI Upgrade instructions on
>www.emulatorarchive.com.
>According to the upgrade instructions either the 3 chips have to be
>installed or all 3 chips should already have been factory-installed.
>If they're not installed, the IC13 should have no 28 pin socket yet.
>But mine has...
>I really don't know what machine I bought, it seems like a prototype
>of the Emax Plus...
>
>Anyway: can anyone confirm that the specs are sufficient, so that I
>just have to add a DB25 SCSI port and a flat cable ?
>Or should I simply try & check ?
>
>
>
>Thanks !!
>
>///E-Synthesist
>
>
>
>