This post gives a short overview about the RLV12 Emulator. There are two versions, one for my PDP-11/Hack and one for normal Q-Bus systems. It plugs into the backplane of a PDP-11 system and emulates a RLV12 controller with 4 RL01/02 units attached.
A PDP-11 is more fun to use, when you have more memory, especially when your system supports 22-bit addressing. Therefore I decided to build my own PDP-11 Q-Bus memory board.
This is a short resume about my Plessey Peripherals PDP-11. Or let’s say about the remains of the system which for a long time was just a play ground and today I could revive it as a fully functional PDP-11. Even only the core is of the original system, adding new components for the surround still let’s you experience the real look and feel of a small PDP-11.
This is a loose collection describing my hobby projects in electronics of the past few years. I started with electronics a long time ago at a time when the technology was not as widespread as it is today. Transistors were very expensive and using 74xx as a hobbyist was the bleeding edge. Later I irregularly got back to this hobby but only since about five years I was seriously resuming the hobby again.
A PDP-11 is more fun to use, when you have more memory, especially when your system supports 22-bit addressing. This article is about the first memory card I have built for Q-Bus systems. This is a very simple Memory Card which uses 1M x 16 bit SRAM. It supports one or two SRAM for a total of either 2Mbyte or 4Mbyte of RAM.