MHT Speech Synthesizer aka Sintetizador de voz ([[MHT Ingenieros]])
== 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
* [[SP0256 Pin-Outs]]
== Supported software ==Now, thanks to Jose Leandro, the hardware specialist of the spectrum, with his famous page :
* No (known) software?http://trastero.speccy.org/cosas/JL/JL.htm We can know more about this hardware.
== Pictures ==
<gallery caption="MHT Speech">
File:MHT-sintetizdor_de_voz-001.jpg|Outside
File:MHT-sintetizdor_de_voz-003.jpg|Inside
File:MHT-sintetizdor_de_voz-004.jpg|Component Side
File:MHT-sintetizdor_de_voz-007.jpg|Solder Side
File:NoPicture.gif|Part number on GI chipFile:NoPicture.gif|Part number on oscillator
</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 "GI" logo on the large chip implies that it 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).
The GNDed pins somewhat confirm that it is a SP0256 (Pin1=Supply GND, Pin10,11=A8,A9, ie. only 6bit allophone numbers used).
<gallery caption== Other Pictures =="MHT Speech Synthesizer Layout, thanks to Jose Leandro"> File:MHT Speech Synthesizer - interface_delante.jpg|TopFile:MHT Speech Synthesizer - interface_detras.jpg|BottomFile:MHT Speech Synthesizer - cara_componentes.jpg|ComponentsFile:MHT Speech Synthesizer - cara_pistas.jpg|TracksFile:MHT Speech Synthesizer - PCB Front.png|PCB BackFile:MHT Speech Synthesizer - PCB Back.png|PCB FrontFile:MHT Speech Synthesizer - PCB Chips.png|PCB ChipsFile:MHT Speech Synthesizer - PCB Complete.png|PCB CompleteFile:MHT Speech Synthesizer - componentes.png|ComponentsFile:MHT Speech Synthesizer - pistas.png|TracksFile:MHT Speech Synthesizer - Layout.png|Layout
<gallery caption="Probably NOT another version of the MHT Speech Synthesizer?">
File:MHT-sintetizdor_de_voz-005.jpg
File:MHT-sintetizdor_de_voz-008.jpg
</gallery>
Not sure where these photos come fromThe part numbers on the chips seem to be scratched-off (or covered by paint, why they are here, and if they do actually show a or is it just old glue from stickers?). The "GI" logo on the large chip implies that it is the popular General Instrument [[SP0256]] speech synthesizerchip, probably the standard -AL2 version (the ending L2 may be still visible? not sure there - on the photo it vanishes under the pot axis). There The clock frequency of the oscillator isn't much visible, the upper board contains an enormous amount of logic chips (no idea what forfrom the perspective from where the photos were taken). The lower board contains even more logic chips GNDed pins somewhat confirm that it is a SP0256 (strange)Pin1=Supply GND, and two big chipsPin10, which might be ROM11=A8, or RAMA9, or maybe a speech chipie.only 6bit allophone numbers used)..? '''Caution''' - There are two files, [[:Image:MHT-sintetizdor_de_voz-005.jpg]] and [[:Image:MHT-sintetizdor_de_voz-008.jpg]] circulated in internet. Despite of their filenamesfilesnames, these pictures probably they do NOT show a MHT speech synthesizer.''' Though - please do not add these files to this page! The hardware shown on those pics is an [[ARA Video Digitizer]], nothing to do with the 3MHT Speech.5mm socket, it may be some kind of audio output or audio input device == Software Covertape == <gallery caption="Software Covertape"> Image:Software del Sintetizador de Voz (MHT) Front Covertape.jpg|Front CovertapeImage:Software del Sintetizador de Voz (MHT) Back Covertape.jpg|Back CovertapeImage:Software del Sintetizador de Voz (MHT) Tape - Side B.?jpg|Tape - Side BImage:Software del Sintetizador de Voz (MHT) Tape - Side A.jpg|Tape - Side A </gallery>
== Downloads ==
* No included driver/sample program[[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]]