Emax

The PALs are on the expansion board, and they are the same for the 4/6/8 meg upgrades, but the 5/7 meg upgrades use different PALs.
I have 2 main boards that I removed the 9306's from and soldered sockets in for them, they are both 4 meg boards. I'll order a few 93C06's or 93C46's and do some experiments.

On a side note, if anyone has an EmaxII they want to sell(working or not), let me know, I have a rack unit that I acquired off Ebay, but it is in pretty rough shape, and I could use another case for it.
Then I could also use the extra parts to set up a unit on the workbench, for experimenting on.

--- In emax@yahoogroups.com, Ted Summers <djtbs1@...> wrote:
>
> I am only saying that it might be that you won't get a valid data file  
> out of it due to it being in the board as opposed to being in the IC  
> holder on the EEPROM burner.
> You might get erroneous data.
> I would think you would only damage it if you accidentally shorted the  
> pins when using the clip.
> Or zapped it, plain and simple.
> This can be avoided by using static safe equipment during removal and  
> handling.
> 
> This would only work if you already had the upgrade prior, as I agree  
> with the statements regarding the PALs.
> If the PALs come on the memory upgrade board, then it is a non issue-  
> however if you want to add memory and don't have the board....
> 
> So two scenarios- look at the PAL IP#s to see if the same PALs are  
> used on all the upgrade boards (2,4,8). If the same PAL, then they  
> aren't locking the memory size, beyond telling the system to address  
> the expansion board.
> 
> If different PALs in every model, we would need PAL binaries, and the  
> 9306 versions from each type....
> 
> Maybe Rob at Emulator Archive could sweet talk the guys at E-Mu to get  
> those PAL binariess too.
> If so, then someone could send me the files and I would see if my  
> resources could (once again) help me to convert the original files to  
> make new chips.
> The Emax 1 SCSI PAL binaries were in a non-standard format...only the  
> original programmer module could be used with them, and Emu didn't  
> divulge what the programmer was.....hence the necessary conversion.
> 
> What PAL IC are they? are they the same PAL16R4? If so, I got 140 NOS  
> of them.
> But without an Emax 2, I couldn't test / verify them.
> 
> Just my thoughts,
> Ted
>