Vintage Simmons Drums (UK) Users Group

Awesome, guys. Thanks for the tips.
I'll be using an EPB. Does that change anything?

--- In Simmons_Drums@yahoogroups.com, Gordon JC Pearce MM3YEQ <gordon@...> wrote:
>
> On Mon, 2009-04-20 at 13:58 +0000, Simmons_Drums@yahoogroups.com wrote:
> 
> > 1a. Eproms
> >     Posted by: "blacklodgeed" edrose1@... blacklodgeed
> >     Date: Mon Apr 20, 2009 6:32 am ((PDT))
> > 
> > I need to buy eproms to burn for my SDS 7. I know I'm looking for
> > 2764's and 27128's but there seem to be differences within those types
> > of eproms. What do I need to look for and what should I avoid?
> > Thanks in advance.
> > Ed
> 
> Makes no difference to the SDS-7, as long as it's got the right number
> of pins.  Where it does make a difference is in programming - typically
> a 27C128 will require 12.5V programming rather than 21V programming, but
> your programmer should take care of this for you.  On some cheap crappy
> programmers like my Willem PCB3 there's a jumper to set, for the
> voltage.
> 
> You can even use 27C256 and 27C512 EPROMs which are usually cheaper -
> either ground the extra pins or blow two or four samples in and select
> which one by grounding the unused pin (add a 1k pullup resistor to 5v to
> avoid weird glitches).
> 
> Gordon
>