Alesis MMT-8 User Manual download pdf

Alesis MMT8 16x Memory Expansion Modification (Black model MMT8’s)

by Graham Meredith, 2006 Revised 15

January 2009

gmer[email protected]om.au

This modification expands the memory of the Alesis MMT8 to 16x the original memory capacity. It works just as

if you had 16 separate MMT8’s – each “bank” is an entire MMT8 memory bank.

The total cost of the expansion should be around $US45!!

Each bank is accessed by switching a 16 position rotary switch to choose the current memory. Each memory

holds 99 songs, 99 parts, 8 tracks – just like the original MMT8 memory.

The down side of this expansion is that you can’t use a part from, say, memory bank 1, and another part from memory

bank 2, and put them into the same song. Each memory is isolated from the other. However, you can save and load

the memory contents from each memory bank as a whole bank, as individual songs, or individual parts, just like doing

memory dump on the original memory.

You can also save individual parts or songs to MIDI or tape, change memory position, and load them into the

next memory. But you can’t directly copy a part or song from one memory to another. You have to save them to

tape or disk and then load them into the next memory.

Equipment

Soldering iron, 15W (no greater – can damage the circuit tracks by excess heat), solder

Antistatic wrist band and cable

Wire cutters

Components required

RAM chips - x 2 needed:

BSI SRAM memory chip BS62LV4006PC-70 SRAM

(512k x 8 bit) – About US$19 each – 2 needed

http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-

1&storeId=10001&catalogId=10001&productId=157358&

Other bits:

Veroboard stripboard

Heat shrink insulation tubing - small diameter 2-3mm, black and red

Double sided mounting tape

Hookup wires - insulated, of different colours, such as ribbon cable

Resistors - 10k, ¼ watt – x 8 needed

Switches: 4-bit Hexadecimal Rotary encoder switch: about US$6.00 --- x 1 needed

http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-

1&storeId=10001&catalogId=10001&productId=581301&

Or this better, neat pushbutton one instead, with a number display:

https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-

1&storeId=10001&catalogId=10001&productId=577117&

1 2 3 4 5 6 ... 12 13

Summary of Contents

Page 1

Alesis MMT8 16x Memory Expansion Modification (Black model MMT8’s) by Graham Meredith, 2006

Page 2 - Preparation:

Solder a 1k resistor into the red wire as shown. Insulate the resistor connections with heat shrink tubing or insulation tape. So

Page 3

The Encoder power supply Solder the red wire from the encoder board to this solder blob on the board here. This is the board’s +5V power supply poin

Page 4 - Making the Encoder board

Testing the memory expansion and formatting (initializing) the memory 1) Reconnect your memory battery. Solder the cut leg back together. 2) Loose

Page 5 - Wiring up the memory chips

The memories in use The general best practice is to switch the machine off before changing the memory position. If you change the memory position a

Page 6 - Installing the chips

Preparation: Put on the antistatic wrist band and cable; connect the cable somewhere to earth, such as a water tap on the kitchen bench. This will pr

Page 7

The power supply points to the memory chips: Black MMT8’s

Page 8

Making the Encoder board 1) Cut a piece of veroboard strip to the size shown below: 2) Take 4x 10k resistors and solder one end of them toget

Page 9 - Mounting the encoder board

Wiring up the memory chips The top end of the chip is marked by a small notch in the end of the chip. 1) Bend the rows of chip pins slightly in

Page 10

Installing the chips 1) Solder a 5” length of red wire to the solder blob on the board as shown above. This is the power supply wire to the chips

Page 11

1) Remove chip 1 from the socket. Solder 3” lengths of blue, green, yellow, and orange wires to the top of the shoulders of chip 1’s pins 1, 2, 30 an

Page 12

4) Solder the red power wire that is soldered to the solder blob on the board to pin 32 of both chips. This is the power supply pin of the chips. Thi

Page 13 - The memories in use

Mounting the encoder board 1) Place a small strip of double sided sticky tape somewhere convenient in the casing to mount the encoder board. Stick t

Alesis MMT-8 User Manual

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Browse online or download User Manual for Music drums Alesis MMT-8. Alesis MMT8 16x Memory Expansion black version

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