IBM 51xx Memory Expansion Card / Quadram / Quadboard

Homepage

Introduction

This Quadboard is from 1982, has a maximum of 256 KByte RAM, a serial and parallel interface and the RTC. I had to change the battery, because it was completely empty and a bit leaking. The repair of the track hasn't become that fancy, but RTC and battery are working fine again. The new battery is a Varta V2/150H-SLF (NiMH 150 mAh 2.4 V). The contacts fitted perfectly into the old holes.

Figures

Quadram / Quadboard / 1982
Quadram / Quadboard / 1982
Quadram / Quadboard / 1982 / 4x64 KByte RAM
Quadram / Quadboard / 1982 / 4x64 KByte RAM (MCM6665BP15)

All RAM modules (MCM6665BP15, 15 ns, class 4164) are from Motorola and work flawlessly.

Quadram / Quadboard / 1982
Quadram / Quadboard / 1982
Quadram / Quadboard / 1982 / new RTC battery
Quadram / Quadboard / 1982 / new RTC battery

Downloads

Links

Manuals (other)