== Technical ==
Probably It uses a [[SP0256]](-AL2?) chip. * The '''I/O addresses are unknownaddress is &FBE0.'''(only A10,A7,A6,A5 and A4 are decoded)
* The '''clock frequency is unknown''' (as shown on the photo, it uses an oscillator, ie. NOT the 4MHz signal on the expansion port).
Port '''????'''h FBE0h READ: bit'''?''' 6 Status 1 (0=Speech Busy, 1=Ready/Halted) (SBY Pin, Speech Busy) bit'''?''' Status 2 (0=Ready to Receive Data7, 1=Busy) (/LRQ Pin, Load Request) bit'''?D5-?''' D0 Not used (garbage, probably usually highz)Port '''????'''h FBE0h WRITE: bit7-6 Reserved (should be be zero, though SP0256 Pins10-11 are GNDed)Ignored
bit5-0 Allophone number ;data can be send when Status.Bit'''?'''=0
<gallery caption="MHT Speech Synthesizer Layout, thanks to Jose Leandro">
File:MHT Speech Synthesizer - interface_delante.jpg|Top
File:MHT Speech Synthesizer - interface_detras.jpg|Bottom
File:MHT Speech Synthesizer - cara_componentes.jpg|Components
File:MHT Speech Synthesizer - cara_pistas.jpg|Tracks
File:MHT Speech Synthesizer - PCB Front.png|PCB Back
File:MHT Speech Synthesizer - PCB Back.png|PCB Front
File:MHT Speech Synthesizer - PCB Chips.png|PCB Chips
File:MHT Speech Synthesizer - PCB Complete.png|PCB Complete
File:MHT Speech Synthesizer - componentes.png|Components
File:MHT Speech Synthesizer - pistas.png|Tracks
File:MHT Speech Synthesizer - Layout.png|Layout
</gallery>
== Tape ==
=== Software Covertape ===
<gallery caption="Software Covertape">
Image:Software del Sintetizador de Voz (MHT) Front Covertape.jpg|Front Covertape
Image:Software del Sintetizador de Voz (MHT) Back Covertape.jpg|Back Covertape
</gallery>
The part numbers on the chips seem to be scratched-off (or covered by paint, or is it just old glue from stickers?).
The hardware shown on those pics is an [[ARA Video Digitizer]], nothing to do with MHT Speech.
== Software Covertape ==
<gallery caption="Software Covertape">
Image:Software del Sintetizador de Voz (MHT) Front Covertape.jpg|Front Covertape
Image:Software del Sintetizador de Voz (MHT) Back Covertape.jpg|Back Covertape
Image:Software del Sintetizador de Voz (MHT) Tape - Side B.jpg|Tape - Side B
Image:Software del Sintetizador de Voz (MHT) Tape - Side A.jpg|Tape - Side A
</gallery>
== Downloads ==
* [[Media:Software of Sintetizador de voz (MHT Ingenieros).zip|Software of Sintetizador de voz (MHT Ingenieros).zip]] (CDT for Emulators)
* [[Media:MHT Speech Synthesizer (Eagle).zip|MHT Speech Synthesizer (Eagle).zip]] (MHT Speech Synthesizer files for Eagle)
* [[Media:Sp0256-al2-reversed-bit-order.zip|SP0256-AL2 ROM]] ('''caution''' - the bytes in the file are in reversed bit-order, ie. the "Target" values are unreversed, all other opcodes and parameters are reversed)
* [[TMPI speech synthetizer]] ([[MEA8000]] based)
* [[Software Speech Synthesizers]] (Software based)
== Weblinks ==
* [http://www.cpc-power.com/index.php?page=detail&num=10936 ''MHT Speech Synthesizer'' from CPC-Power]
* [https://cpcrulez.fr/hardware-audio-synthetiseur_vocal-MHT-sintetizdor_de_voz.htm ''MHT Speech Synthesizer'' from CPCrulez]
* [http://hardware.speccy.org/temp/Amstrad-SintetizadorMHT.html ''MHT Speech Synthesizer'' from hardware.speccy.org]
[[Category:Music and sound]] [[Category:Peripherals]]