August 30th, 2009
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Categories: C64/SX64, News & Rumors, Today
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ZX Spectrum +3 (Issue 1) Sound Fix *updated*
August 22nd, 2009
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Sound fix diagram here. (pdf)
from Cristian Secară Homepage:
The first release (the +3) has a fatal hardware mistake: the 128K sound output is completely distorted.
- Tech explanation: the analog output of the AY-3-8912 sound chip was intended to be amplified by a one stage common-emitter transistor. In practice, they have forgot to put a resistor to the transistor’s emitter. The result: the transistor works in switch-mode – the sound is converted from analog multi-level amplitude to digitized two-level amplitude, same as the old 48K sound system.
source: secarica.ro ay8912 Demos
Categories: Gallery, Projects / Repairs, Retro Computers and other stuff..., Sinclair family, Today, Various
August 18th, 2009
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Categories: C128/128D/128DCR, C16/116/264/Plus4, C64/SX64, DTV, News & Rumors, Today, VIC20/VC20
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