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Model: SIMMdoubler II Memory Upgrade

Available for: Macintosh II, IIci, IIsi, IIcx, IIx, IIvx (IIvi & Performa 600) & IIfx

Re-Use Your Old 30-Pin SIMMs

SIMMdoubler II Memory Upgrade

The SIMMdoubler II is an ideal memory hardware upgrade product for your Macintosh II series computer. Expand your Macintosh's memory to its fullest capability by creating different size SIMM modules with various size SIMMs.


SIMMdoubler II Benefits
CheckmarkIncrease your memory up to 64MB
Works with standard 1MB, 2MB and 4MB SIMMs.
CheckmarkReuse your existing SIMMs
The SIMMdoubler II adds additional SIMM slots so you can use existing memory.
CheckmarkUse standard SIMMs
The SIMMdoubler II circuitry eliminates the need for special PAL SIMMs for the Macintosh II and IIx.
CheckmarkCostly ROM exchange not required
The Macintosh II no longer needs a ROM exchange to go beyond 8MB of memory.
CheckmarkCustomize your memory configuration
The SIMMdoubler II allows you to build 2MB, 3MB, 4MB, 5MB and 8MB SIMMs by combining
1MB, 2MB and 4MB SIMMs in various configurations.
CheckmarkEasy 10-minute installation
As easy as adding SIMMs. Just populate a SIMMdoubler II board with two SIMMs, set the
configuration switches and plug it into a SIMM slot on the logic board.

Reuse & Save: If you are looking to expand the RAM capacity of your Macintosh II, IIci, IIvx (IIvi, Performa 600), IIsi, IIcx, IIx or IIfx, then MicroMac has the perfect memory upgrade product for you. The SIMMdoubler II consists of four boards that plug into the SIMM slots on the logic board of your Macintosh. Each SIMMdoubler II board consists of two slots which effectively doubles your SIMM capacity. This is the most cost effective solution to add physical memory to your existing DRAM by combining or using SIMMs you currently own or plan to purchase.

Example: Create a 16MB Macintosh IIci by installing one set of 3MB SIMMdoubler II boards (a combination of one 1MB and two 2MB SIMMs) in Bank A and four 1MB SIMMs in Bank B on the logic board.


Macintosh Model




SIMMdoubler II

Mac II, IIci, IIsi, IIcx & IIx

30-pin SIMM

set of 4 boards


SIMMdoubler II-P600

IIvx (IIvi & Performa 600)
(includes right angle adapter)

30-pin SIMM

set of 4 boards


SIMMdoubler IIfx


64-pin SIMM

set of 4 boards


- Available Files to Download for the SIMMdoubler II -

Memory Upgrade Software:
None required

Utilities Software:
Speedometer 4.0

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Copyright ©1996 MicroMac Technology.
This page last modified on October 1, 1996 (mdh).