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I just finished modding my 1541-II for using a regular off-the-shelf 2A/12V smps with barrel jack. I'm using a step-down buck converter to get 5V from 12V. It works perfectly!!! Here is what everything looks like:

After fixing two 1541-2's, I decided I should make a new power supply for them. However this led me thinking what really is the power requirement for these drives, so I checked it. I have a Chinon and a Mitsumi/Newtronics 1541-II drive so I checked for both. In case you're wondering, the...

Hi speccy friends. The original power supply for the ZX Spectrum is a simple transformer+full rectifier+smoothing capacitor. I am wondering if a modern power supply is better in terms of noise? A modern one is definitely more efficient but is it at a cost for noise? Should I go with an...

Does anyone know the mask ROM settings in the 6530-038 RIOT for A6, A7, A8, A9, A10, A11 and A12? I need to know how it was programmed to be able to check the health of the ROM and RAM. Basically I need to know how to select RAM and ROM. Herer is an example for different configurations of 6530...

Hi everyone, I'm having this strange issue with my business key european universal 8032 (assy 8032089) The problem is, if I do a print chr$(193), I get A as expected. However, if I do a poke (32768~34767),193 I get inverse A. Additionally, if I print any uppercase letter on the screen by...