Цитата Сообщение от m.d. Посмотреть сообщение
But is Spectrum+ have an additional circuitry for emulating combo key presses with a single 'extended' key? Exteneded keys in many russian clones consist of 2 standard keys which are pressed simulatenously.
ZX Spectrum 16/48kB - dual layer membrane, only single keys(separate shift)
User must manually press SHIFT key + next keys..



All next ZX models (ZX48+,ZX128,ZX128+2,+2A,+3) use new keyboard with 58 keys (added new keys combined with SHIFT).



http://velesoft.speccy.cz/other/zx-membrane/index.htm

This last models use three layer membrane. On all this keys combined with shift is after press as first contact SHIFT and later also KEY.

You emulate also keyboard matrix exxect ?