You are purchasing a newly made memory module manufactured by myself. The memory modules have been engineered using high quality 4 layer gold plated printed circuit board with internal power and ground planes for maximum data integrity and low power supply ripple. Each memory modules has been professionally hand assembled using new old stock Hitachi 70ns SRAM memory chips. Modules are guaranteed to be functional and have been fully tested in a vintage PowerBook machine.

Low power: Instead of using original pseudo-static RAM (PSRAM), my modules are using more costly real static RAM (SRAM) which do not need refresh and use a third of the power used by original PSRAM.

Compatible with: - PowerBook 140 - PowerBook 145 - PowerBook 170

This module is not compatible with the PowerBook 145B because it has 4MB already soldered on the motherboard. If needed, contact me for a compatible 4MB upgrade module to get up to 8MB.

This module will not fit the 165c and 180c Color Powerbooks.