MHZ 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 FBE0h READ: bit 6 Status 1 (0=Speech Busy, 1= Support software =Ready/Halted) (SBY Pin, Speech Busy) bit 7,D5-D0 Not used (garbage, probably usually highz)Port FBE0h WRITE: bit7-6 Ignored bit5-0 Allophone number ;data can be send when Status.Bit'''?'''=0
* No (known) software?[[SP0256]]* [[SP0256 Voice Generator]]* [[SP0256 Instruction Set]]* [[SP0256 Allophones]]* [[SP0256 Pin-Outs]] Now, thanks to Jose Leandro, the hardware specialist of the spectrum, with his famous page : 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|OutsideFile:MHT-sintetizdor_de_voz-003.jpg|InsideFile:MHT-sintetizdor_de_voz-004.jpg|Component SideFile:MHT-sintetizdor_de_voz-007.jpg|Solder Side
</gallery>
The part numbers on the chips seem to be scratched-off (or covered by paint). The <gallery caption="GIMHT Speech Synthesizer Layout, thanks to Jose Leandro" logo on the large chip implies that is the polular [[SP0256]](-AL2) speech chip from General Instruments. The clock frequency of the oscillator isn't visible (from the perspective how the photo was taken).>
== Other Pictures ==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="MHT Speech Other Version ?">
File:MHT-sintetizdor_de_voz-005.jpg
File:MHT-sintetizdor_de_voz-008.jpg
</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).
'''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 filesnames, they do NOT show a MHT speech synthesizer - please do not add these files to this page!
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)
== Other CPC Speech Synthesizers ==
* [[Amstrad SSA-1 Speech Synthesizer]] ([[SP0256]] based)
* [[Dk'tronics Speech Synthesizer]] ([[SP0256]] based)
* [[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]]