Emu XL-7 & MP-7 User's Group

damn!! wish I was that knowledgable... keep it up!

--- In xl7@yahoogroups.com, Jack Pratt <woodsworth1@...> wrote:
>
> Have been very busy, what with home renovations, computer problems, flooding, 
> etc...
> 
> I finally have been able to finish off the PCB layout for the USB programmable 
> FLASH SIMM {top & bottom layers attached so you can see that its pretty full}. 
> It was a lot of effort because I tried to use 8mil (0.008") track and space to 
> reduce board cost but that was a dead cause, and finally I opted for 6mil track 
> and space. I toiled long and hard to fit in on a 4 layer PCB and only just made 
> it, but I had no way to place a USB connecter, other than a 4 pin header so a 
> special cable will be needed for USB connection... We'll have to see how much 
> the PCB costs (per item)
> 
> I need to check that the CPLD can still be programmed after the pin 
> re-arrangements that I made to help it fit but I don't expect that to be a big 
> problem.
> 
> I needed to make the SIMM 1.1" x 4.25" (the E-mu ones are only 1" high) to make 
> room for the JTAG headers - this should still fit in the modules fine by my 
> reckoning. The idea is that the SIMM gets turned upside down into a socket with 
> the notch removed for JTAG programming.
> 
> Fortunately I was able to procure a copy of the EOS TSM from E-mu which includes 
> schematics for all the E4 series products including the ULTRA samplers. Despite 
> assertions that some people have made to the contrary, there is no signal on the 
> Ultra to drive the PRESET line (to access the preset memory) so there is NO WAY 
> the Ultra can write to a FLASH SIMM's preset memory  [if you see dummy presets 
> on a p2k, then the p2k created them, not the Ultra]. In any case, the issue is 
> that the signal is not driven on an Ultra sampler, so I might decide to add a 
> pull down to that pin so that its not floating [which would allow the SIMM to be 
> read (but not written without a modification to EOS) on an Ultra Sampler].
> 
> So the things left to do....
> 
> 1. Create a PCB for the SIMM reader [much much easier than the SIMM itself]
>     - necessary to program the micro & CPLD + read ROM SIMMs
> 2. Compile the CPLD software for the new pin arrangement [trivial]
> 3. Create Software for the SIMM CPU
> 4. Create Software for the programmer CPU
> 
> Have other stuff to do for now butthe hardest part is done [Yay!]
>