External ultra-high loader for the ZX Spectrum

The EAR socket has been the only way to get programs into the Spectrum for years. And not only Spectrum: other 8-bit micros of that era used the same mechanism: an audio cassette playing tones to a some analog-to-digital converter thing inside the computer.

Now, when all the software ever made for the ZX Spectrum fits in a single $20 memory card, we can see that our chance have greatly improved. But all modern solutions come with a cost: the need for a dedicated interface which talks directly to the computer.

Wouldn't be nice if there were a solution as universal as tape recorder was, but with the facilities and speed of modern hardware? This is a proof of concept for something that could fit these needs. The test has been made on a ZX Spectrum, but recall that all 8-bit computers (except the ZX Spectrum 48K/Plus versions) have the neccesary hardware already fitted!

Want to support this and other upcoming projects? I need only one euro from you. That's all. Thank you very much!


Proof of concept: Alchemist
Jueves, 27 de Septiembre de 2007 00:00

There is a project for developing a set of utilities for handling ultra-loads for some vintage machines. Its name is OTLA. One of the key components of this technology is the well-known ultraload maker, k7zx, from "decicoder".

An ultra-load is a routine that is capable of loading programs at a very high speed. This is now possible because of audio sources nowdays are mucho more reliable than the good old tape recorder. Even with a cheap built-in motherboard sound card, a PC can feed a very good quality signal to the "EAR" audio socket of a Spectrum. This, combined with a clever programming to push the machine at its limits, allows moving from a bare 1500 bps to 15.000 bps and beyond.

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