Emax

I see what you are saying about the pinout, but it looks like there  
are parts available on ebay for $1 to $7, so its not that expensive to  
get the real deal....


On Nov 8, 2009, at 3:57 PM, dwv1957 wrote:

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
 >





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