Posts by AanotherAardvark

Re: Well the requirements of loading data overlap with the requirements for audio

I built a home brewed Z80 machine around the time of the Spectrum. Programs were stored on audio tape with a 1 represented by 5V for 1 tick followed by 0V for 1 tick. Zero was 5V for 2 ticks followed by 0V for 2 ticks. This ensured that there was no DC component in the signal. Data was stored in 1k blocks with a checksum. It ran reliably for years.

I also vaguely remember a system of transmission of Spectrum code with a flashing square on the TV screen. It was picked up by a photo detector. Does anyone know anything about it.

Re: I once had to do something similar in a Skoda...

The Devil's Elbow, now bypassed, was a very steep double bend at the end of a long steep hill on the main road north in Scotland.

In the 1950's there was a layby at the top. It had a watering can, with the AA logo, filled from a stream. There was a very large sign warning drivers to allow the engine to cool down before removing the radiator cap.

My grandfather's car had to stop there every time we travelled north.