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

BTW, is the pin-out of those SIMM modules documented anywhere? Any
reverse engineering results available?

--
Przemek

On 16/07/14 04:58, Jack Pratt woodsworth1@... [xl7] wrote:
>  
> The SIMMs are parallel (address mapped) interfaces. Providing a SD
> card socket is only useful if you provide hardware to convert the SD
> card (serial) contents into a compatible parallel format. It seems
> easier to just provide a USB interface and program the SIMM via a
> computer.
>
> ------------------------------------------------------------------------
> *From:* "'Jon Carroll' joncarroll@... [xl7]"
> <xl7@yahoogroups.com>
> *To:* xl7@yahoogroups.com
> *Sent:* Wednesday, 16 July 2014 12:33 PM
> *Subject:* Re: [xl7] Any interest remaining in a self-programming
> FLASH SIMM?
>
>  
> didn't the flash rom use a serial I/O to read the flash?
>
> ----- Original Message -----
> From: "Jack Pratt woodsworth1@... [xl7]" <xl7@yahoogroups.com>
> To: <xl7@yahoogroups.com>
> Sent: Tuesday, July 15, 2014 5:07 PM
> Subject: Re: [xl7] Any interest remaining in a self-programming FLASH
> SIMM?
>
> the problem with the SD card is that the chips on the P2K can not
> inherently
> read it. So there would need to be some conversion from the SD card
> format
> to the memory mapped format used by the P2K. Of course if you put a
> micro on
> the board it could read from the SD card and rewrite FLASH as
> appropriate.
> Again you could use a special preset (accessing certain memory
> locations in
> the address map) to get the micro to copy one of any different ROM images
> into the FLASH based on which key is pressed. To let the user know
> when the
> copy is complete the "SIMM' could generate a stream of silence until the
> operation is over then produce a beep of some sort (if you are still
> holding
> the key down). If the new image(s) involve different presets/riffs etc
> then
> you would need to restart the P2K (because it only reads that
> information at
> startup).
>
> but is this any better than doing it over USB?
>
> You certainly wouldn't want to have the module opened to change the SD
> card
> all the time, and having a USB cable hanging out a hole seems an easy
> solution.
>
> I believe that the preset ROM holds information that looks like the sysex
> infomation. Additionally I think that the wave ROM holds information that
> looks similar to the disk format of the E4/ultra series.
>
> I am in the middle of writing software to dump the contents of a ROM
> SIMM so
> we can know for sure... will take a day or so.
>
> !
>
> ________________________________
> From: "janoch23@... [xl7]" <xl7@yahoogroups.com>
> To: xl7@yahoogroups.com
> Sent: Tuesday, 15 July 2014 7:36 PM
> Subject: Re: [xl7] Any interest remaining in a self-programming FLASH
> SIMM?
>
> I only suggested dynamically modified samples, half jokingly, to get
> "global
> single-lfo rectangular pwm" and true noise say at waveforms #126 and
> #127.
> However, with 128 MB of sample ROM, you are much better off simply using
> samples for those, and not worrying about some clever scheme in the
> address
> decoder.
>
> With regards to the micro on the SIMM, I think the other view is that
> having
> an SD card slot and figuring out the data format would be more useful
> since
> SD cards are cheap and abundant, and you'd have automatic
> compatibility with
> all kinds of PC operating systems via the ubiquitous card reader. This
> view
> doesn't really hold though because you'd be forced to open up your p2k
> / cs
> every time to pull out the SD card.
>
> Personally I'd also worry that figuring out the data format is not
> simple at
> all and you'd risk having the project die out while people spend years
> trying to reverse engineer it, never fully figuring out every detail.
>
> With your (Jack Pratt's) design at least everybody could duplicate
> existing
> ROMs and have something very useful "out of the box". Seeing how
> designing a
> large waveset is no mean feat, that would probably be the most useful.
>
> ---In xl7@yahoogroups.com, <woodsworth1@...> wrote :
>
> The best way to do this (IMO) is to have a micro on the SIMM that will
> allow
> the FLASH to be 'reprogrammed' via USB. With appropriate software any
> image
> (existing or composed) could be transferred to the SIMM.
>
> Finally the logic device can be used to provide access to on-the-fly
> sounds.
> However there are plenty of limitations to this.
>
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