26 Dec 2013

My Magnetic Core Memory module

I’ve got a Core Memory module from a colleague of mine, which is from way before my time
I really see the beauty of these things, so I thought. Let’s share it:

Wikipedia: Magnetic-core memory was the predominant form of random-access computer memory for 20 years (circa 1955–75). It uses tiny magnetic toroids (rings), the cores, through which wires are threaded to write and read information. Each core represents one bit of information. The cores can be magnetized in two different ways (clockwise or counterclockwise) and the bit stored in a core is zero or one depending on that core’s magnetization direction. The wires are arranged to allow an individual core to be set to either a “one” or a “zero”, and for its magnetization to be changed, by sending appropriate electric current pulses through selected wires. The process of reading the core causes the core to be reset to a “zero”, thus erasing it. This is called destructive readout.

See my gallery…


Posted in retro-computing 

02 Jul 2013

SoundChip T-Shirt

"The things that define our style..."

I really felt like dedicating a T-Shirt to my favourite 80’s computer sound chips

SoundChip T-Shirt This is the result… like it?
Okay, it contains more then only sound chips… some machine brands as well!

Posted in life music retro-computing 

02 Jul 2013

Commodore User port MIDI interface

I’m planning to build a PIC 18F2550-based Commodore User port MIDI interface. It should provide an MIDI interface through USB and directly via a DIN connector. Another idea is to make special (simplified) operation modes for it so these can be easily implemented into existing C64 software…

Commodore User Port MIDI Interface

This is a very early beta stage, but I’ll post updates when I make progress!

Posted in electronics retro-computing 

02 Mar 2013

Rare? Steinberg Research MIDI interface for the C64...

At the last Dutch Comodore User Group a friendly neighbor gave me a Steinberg Research MIDI interface!!

Steinberg MIDI Cartridge

I might be wrong, but I can’t seem to find a picture on the interwebs… so maybe it’s a rare one. I popped the case open to find out that it has the usual ACIA-Chip onboard (Asynchronous Communications Interface Adapter).

I didn’t have time to try it out… but I already cleaned the carts-connector’s traces with an eraser. To be continued!

Edit: This interface tested as compatible with Datel / JMS / C-Lab / Siel. And mine is working fine 

Posted in retro-computing