DiagROM 1.28

Added a little extra feature to the Spectrum diagROM: Now when you press the NMI button on the SMART Card, an upper/lower bus test runs showing any unexpected bits as red colours bars. Always nice to have an immediate visual representation of things..

C64 Keyboard Variations

Added an article regarding the different keyboard types used in the C64 over its lifetime, and some notes on repair.

About Spectrum Plus Membranes

I’m often asked why I don’t stock Spectrum Plus / 128 membranes so I thought I ought to post something about them.

Hey hey ULA! 

Announcing the Retroleum Nebula – A Spectrum (48) ULA replacement module. (Phew – after many months of tinkering, it feels good to finally get that off my chest!)

The Nebula, as you might’ve guessed, is a small daughterboard that plugs into the Spectrum’s ULA socket and performs the same functions as the original ULA chip. It’ll be a bit cheaper than a second hand ULA, and should last longer ;)

You can read all about it here.

Spectrum RAM replacement boards

I’m certainly not the first person to make these but I’ve designed a couple of low power SRAM modules for the Spectrum to replace the DRAM chips originally used. They can be pressed into DIL sockets or soldered direct to the Spectrum PCB.  Available at the store should you need such a thing :)