emulatorII-list

Ahh, I did not know it was also an issue with some rev 1s. Apologies.  
So if these mods were made already, I could just swap out the boards?  
Or would I just be able to use the connection jack? If they were not I  
would have to do steps 1-5 below? Is that correct?

Jeremy

> Hi, please note that not all Rev.1 digital boards had the needed  
> mods to utilize the RS422 connection, and you might want to ask the  
> seller if they have been done already, or if he or the seller ever  
> used it along w/a Mac or CD-ROM set-up? Some Rev.1 digital boards  
> made it out w/ the mod done already, but some still require  
> modifications to be done. Emulator II's with Rev.1 digital boards  
> have the RS-422 drivers installed at the factory (IC's 108 & 132 of  
> the digital board). These will be an 8-pin IC vs. the 7-pin on the  
> Rev.0 boards. Rev.1 boards do not require the installation of an  
> additional RS-422 interface board (Mac Int PCB). However, due to E- 
> mu design changes several modifications are made at the factory to  
> allow the Mac and Emulator to communicate. Unfortunately, these mods  
> were not made at the factory to a number of Rev.1 Emulator II's.  
> Check to be sure that
> the following mods have been made to the digital board:
>
> 1. The trace leading to the end of R48 closest to the back panel has  
> been CUT. R48 is immediately to the left of CN12, the 25-pin  
> computer connector.
>
> 2. The trace going to lC132, pin 10 has been cut. This may be  
> difficult to see. The trace runs right next to the body of the IC  
> socket of IC1 32, on the right side of the chip, between the middle  
> and the bottom of the chip (quite near pin 10). If it has not been  
> cut, or you are not sure, then lift pini 0 of 10132 up out of the IC  
> socket so that nothing contacts it. Do this by removing the entire  
> chip from the socket, then bending pin 10 up and re-inserting the  
> chip into the socket. Pin 10 should not go into the socket.
>
> 3. If you do not have AT LEAST VERSION 2.3 of Emulator II OS  
> software, then the following mod must be performed: Lift pin 22 of  
> IC107 and solder one end of a 1K ohm 1/4watt 5% resistor to it.  
> Solder the other end of the resistor to +5 volts DC anywhere nearby.
>
> 4. To improve data integrity, change resistor R47 on the logic board  
> from 10K ohms 1/4W 5% to 1K ohms 1/4W 5%. Soldering a 1K ohm  
> resistor in parallel with the existing 10K ohm resistor at R47 will  
> also work.
>
> 5. Verify that the two internal EPROM’s in the Emulator (MAIN and  
> SCANNER) are AT LEAST Rev. 2.1. Verify that the Emulator II OS  
> software being used is at least Rev. 2.2.
>
> Cheers, emulator_island