The next part of Robert Price's journey exploring DTMF touch tones on the #RC2014 with source code for generating the DTMF tone pairs in #Z80 assembly with Ed Brindley's AY soundcard and my ZXTT module:
https://mastodonapp.uk/@robertprice/113760746291278416
For anyone interested I've ZXTT modules ready in stock, available directly here:
Tindie: https://www.tindie.com/products/quazar/zxtt-zx-true-tone-add-on-for-rc2014-ymay/
eBay: https://www.ebay.co.uk/itm/116425992600
Released in August 2021 the ZXTT clocks the AY/YM soundchip at the same exact frequency as the ZX Spectrum 128K computers.
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