MHT Speech Synthesizer

MHT Speech Synthesizer aka Sintetizador de voz (MHT Ingenieros)

Technical

Probably uses a SP0256(-AL2?) chip.

• The I/O addresses are unknown.
• The clock frequency is unknown (as shown on the photo, it uses an oscillator, ie. NOT the 4MHz signal on the expansion port).

Supported software

• No (known) software?

Pictures

• MHT Speech
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The part numbers on the chips seem to be scratched-off (or covered by paint). The "GI" logo on the large chip implies that is the popular General Instrument SP0256 speech chip, probably the standard -AL2 version (the ending L2 may be still visible? not sure there - on the photo it vanishes under the pot axis). The clock frequency of the oscillator isn't visible (from the perspective from where the photos were taken).

Other Pictures

• MHT Speech Other Version ?
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Not sure where these photos come from, and if they do actually show a speech synthesizer. There isn't much visible, the upper board contains an enormous amount of logic chips (no idea what for). The lower board contains even more logic chips (strange), and two big chips, which might be ROM, or RAM, or maybe a speech chip...?