E-mu Emulator Sampler User Forum for the EIII EII EI and EIII XP - Convert EII to EII +

 Welcome, Guest. Please login or register.
Did you miss your activation email?
November 23, 2024, 04:50:17 AM
Home Help Search Login Register
News: Problems registering? Send an email to: EIII @ telenet.be (without the spaces)

+  E-mu Emulator Sampler User Forum for the EIII EII EI and EIII XP
|-+  General Category
| |-+  EII Technical Issues / Tips
| | |-+  Convert EII to EII +		 « previous next »
Pages: 1 [2] 3 4 5 Print
Author Topic: Convert EII to EII +  (Read 24646 times)
dfiorucci
Full Member
***
Offline Offline

Posts: 141
« Reply #15 on: August 01, 2018, 07:19:28 PM »
It even still has the stand offs for the piggyback board same as mine.
Logged
Electro disco club
Full Member
***
Offline Offline

Posts: 83

Sp 12 turbo / Emu II /
« Reply #16 on: August 02, 2018, 06:42:37 AM »
Mine is serial 1160 i think. I had never seen the jumpers setting to upgrade memory.

I have the main 2.1 eprom.
Logged
2 hands with 10 fingers
dfiorucci
Full Member
***
Offline Offline

Posts: 141
« Reply #17 on: August 03, 2018, 06:46:01 PM »
The jumper settings are between IC10 & IC11
256k = W1 & W4
64k = W2 & W3

I wired toggle switches to switch the connection for W1 W2 and W3 W4
So I wired the one that goes W1 or W2 to one switch and W3 or W4 to another switch.
Logged
Electro disco club
Full Member
***
Offline Offline

Posts: 83

Sp 12 turbo / Emu II /
« Reply #18 on: August 04, 2018, 03:16:05 AM »
Okai okai.

I've order tms4256 150ns on eBay. I've checked th? digital board S/N ans it is numbered 880!.

I have the eprom 2.1 main but I Saw on EII+ pictures from th? forum that's main 2.1EII+ printed on the eprom. See bushing conversation
Logged
2 hands with 10 fingers
Electro disco club
Full Member
***
Offline Offline

Posts: 83

Sp 12 turbo / Emu II /
« Reply #19 on: August 04, 2018, 03:19:16 AM »
I will never never sell my EII ! My children will play with it on 2049.
Logged
2 hands with 10 fingers
dfiorucci
Full Member
***
Offline Offline

Posts: 141
« Reply #20 on: August 04, 2018, 02:02:32 PM »
My understanding of the Main boot rom is that 2.1 no matter how it is labeled is truly the same.
So the Main 2.1 works for all versions.
I checked two bin files one labeled 2.1 and the other labeled 2.1+ and they where identical.
My order of extra KM41256AP-12 came in yesterday going to have another go at this.

It might be that earlier version of the plus where only compatible with the 150ns chips since that was the speed of the 64k variety.
They may have changed a resistor value capacitor value or one or several chips to get the timing right for using the 120ns variety drams.
I have 16 pictures sent by Alpha maybe I'll be able to find a clue there.
Logged
dfiorucci
Full Member
***
Offline Offline

Posts: 141
« Reply #21 on: August 04, 2018, 06:30:55 PM »
No success today with the 120ns 256k drams so I ordered some 150ns 256k drams.
It may just be a timing issue for my particular Emulator II.
Hopefully I will have success next weekend t get this to an Emulatator II+.
Have my fingers crossed.
I was able to verify that there is no difference in chips that are left empty between the EII and the EII+ when both have the Rev 1 digital board.
Logged
Electro disco club
Full Member
***
Offline Offline

Posts: 83

Sp 12 turbo / Emu II /
« Reply #22 on: August 04, 2018, 11:05:56 PM »
WE crossed th? fingers yeah.

I have ordered Texas instrument 150ns..

EII + or EII - ?
Logged
2 hands with 10 fingers
dfiorucci
Full Member
***
Offline Offline

Posts: 141
« Reply #23 on: August 05, 2018, 11:03:40 PM »
What chip do you have at IC11 on the digital board.
All the pictures I've seen so far of the EII+ has a CD74HCT138E by texas instruments in them
Mine has a 74HCTLS138N I can't seem to find any exact information on the one in mine but I know they are of the same variety Line Decoder/Demultiplexer Inverting and Non-Inverting but they could have different output combinations and this might be the difference.
Logged
Electro disco club
Full Member
***
Offline Offline

Posts: 83

Sp 12 turbo / Emu II /
« Reply #24 on: August 06, 2018, 08:38:29 AM »
It is a CD... on mine
Logged
2 hands with 10 fingers
dfiorucci
Full Member
***
Offline Offline

Posts: 141
« Reply #25 on: August 06, 2018, 05:55:39 PM »
Also check IC98 it should be the same.
This might be why the upgraded memory is not working for me.
Sounds like a Mouser order in my near future.
Thanks,
Dana
Logged
dfiorucci
Full Member
***
Offline Offline

Posts: 141
« Reply #26 on: August 06, 2018, 06:03:45 PM »
Unless the chips that I have in IC11 and IC98 are just an off brand that is labeled different I may have found the difference between the regular and the plus models along with the 256k drams of course.
Logged
Electro disco club
Full Member
***
Offline Offline

Posts: 83

Sp 12 turbo / Emu II /
« Reply #27 on: August 07, 2018, 08:04:45 AM »
It's a CD again.
! Maybe it IS a Good news
Logged
2 hands with 10 fingers
Electro disco club
Full Member
***
Offline Offline

Posts: 83

Sp 12 turbo / Emu II /
« Reply #28 on: August 09, 2018, 12:01:49 PM »
Hy!
I wonder what did you use To make the jumper setting? What kind of harness?
Do you have To solder behind the digital Board( removed the Board... ) Or solder simply above the Board?
I dont receive yet the DRAM..
Thanks
Logged
2 hands with 10 fingers
dfiorucci
Full Member
***
Offline Offline

Posts: 141
« Reply #29 on: August 13, 2018, 05:13:13 PM »
Just two jumper wires on top is all you  probably won't have to pull the board to solder them in.
Logged
Pages: 1 [2] 3 4 5 Print 
« previous next »
Jump to:  


Login with username, password and session length

E-mu Emulator Sampler User Forum for the EIII EII EI and EIII XP - Convert EII to EII +

SEO light theme by © Mustang forums. Powered by SMF 1.1.21 | SMF © 2015, Simple Machines