Vintage Simmons Drums (UK) Users Group

Anyone out there know what's inside the SDE Memory Cartridge? Is it just an HM6264LP-15 RAM chip like on the PCB?

Thanks in advance!

HI, yes i think so. Most external RAM cards use the same chip...i can name numbers of examples so why should this be different. ;) just copy the part of the internal ram circuit going to the cpu. Just adding only an extra chip wont work, it will need some extra circuitry to adress the ext. ram chip. There are schematics available of the Siel DK80 ram card...it uses the same ic. Maybe it will help you ikndentify the other circuitry concerning the SDS.
br, Dennis http://soundcloud.com/wifiwww.facebook.com/matanateknik                               

     On Sunday, November 23, 2014 3:50 AM, "edrose1@... [Simmons_Drums]" <Simmons_Drums@yahoogroups.com> wrote:
   

      Anyone out there know what's inside the SDE Memory Cartridge? Is it just an HM6264LP-15 RAM chip like on the PCB?
Thanks in advance!    <!--#yiv3727965505 #yiv3727965505ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv3727965505 #yiv3727965505ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv3727965505 #yiv3727965505ygrp-mkp #yiv3727965505hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv3727965505 #yiv3727965505ygrp-mkp #yiv3727965505ads {margin-bottom:10px;}#yiv3727965505 #yiv3727965505ygrp-mkp .yiv3727965505ad {padding:0 0;}#yiv3727965505 #yiv3727965505ygrp-mkp .yiv3727965505ad p {margin:0;}#yiv3727965505 #yiv3727965505ygrp-mkp .yiv3727965505ad a {color:#0000ff;text-decoration:none;}#yiv3727965505 #yiv3727965505ygrp-sponsor #yiv3727965505ygrp-lc {font-family:Arial;}#yiv3727965505 #yiv3727965505ygrp-sponsor #yiv3727965505ygrp-lc #yiv3727965505hd {margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;}#yiv3727965505 #yiv3727965505ygrp-sponsor #yiv3727965505ygrp-lc .yiv3727965505ad {margin-bottom:10px;padding:0 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Hi, 
You also will need a battery to hold memory for the 6264 on the card otherwise the ram wont hold its memory. ;)http://users.ece.utexas.edu/~valvano/Datasheets/HM6264.pdf
Here is the data sheet for the 6264 http://soundcloud.com/wifiwww.facebook.com/matanateknik                             


     On Monday, November 24, 2014 9:25 PM, "edrose1@... [Simmons_Drums]" <Simmons_Drums@yahoogroups.com> wrote:



     Thanks for the info, everyone - very much appreciated.
The schematic I found for the Siel uses a 6116 which is only 16k and requires a battery to hold memory. Let me know if that's the wrong schematic.
Regarding Phil's post, what value of capacitor is required for decoupling? And, would it be as simple as a straight 1:1 wiring with the resistors and capacitor between the PCB and 6264?  #yiv1490423245 #yiv1490423245 -- #yiv1490423245ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv1490423245 #yiv1490423245ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv1490423245 #yiv1490423245ygrp-mkp #yiv1490423245hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv1490423245 #yiv1490423245ygrp-mkp #yiv1490423245ads {margin-bottom:10px;}#yiv1490423245 #yiv1490423245ygrp-mkp .yiv1490423245ad {padding:0 0;}#yiv1490423245 #yiv1490423245ygrp-mkp .yiv1490423245ad p {margin:0;}#yiv1490423245 #yiv1490423245ygrp-mkp .yiv1490423245ad a {color:#0000ff;text-decoration:none;}#yiv1490423245 #yiv1490423245ygrp-sponsor #yiv1490423245ygrp-lc {font-family:Arial;}#yiv1490423245 #yiv1490423245ygrp-sponsor #yiv1490423245ygrp-lc #yiv1490423245hd {margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;}#yiv1490423245 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i was under the assumption that the simmons boxes all used the same memory cart.  even the SDS6

 NEW ALLIANCE EAST!!!!

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     On Thursday, November 27, 2014 8:33 AM, "edrose1@... [Simmons_Drums]" <Simmons_Drums@yahoogroups.com> wrote:
   

     Awesome! Many thanks, Dennis. Will this guy work?
http://www.alliancememory.com/pdf/AS6C6264.pdf

Yes that one will do...as a matter of fact..if its a 6264 its a 6264 ;) there are just different manufacturers that use different pre suffix;s etc...
good luck and keeps us up to date about your progress (Y)
br Dennis http://soundcloud.com/wifiwww.facebook.com/matanateknik                               

     On Thursday, November 27, 2014 2:33 PM, "edrose1@... [Simmons_Drums]" <Simmons_Drums@yahoogroups.com> wrote:
   

     Awesome! Many thanks, Dennis. Will this guy work?
http://www.alliancememory.com/pdf/AS6C6264.pdf