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|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>
<gallery caption="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> The part numbers on the chips seem to be scratched-off (or covered by paint, or is it just old glue, from the stickerstickers?). 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. == Other Pictures 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 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 from, why they are here, and if they do actually show a speech synthesizer== Downloads == * [[Media:Software of Sintetizador de voz (MHT Ingenieros). There isn't much visible, the upper board contains an enormous amount zip|Software of logic chips Sintetizador de voz (no idea what MHT Ingenieros).zip]] (CDT forEmulators)* [[Media:MHT Speech Synthesizer (Eagle). The lower board contains even more logic chips zip|MHT Speech Synthesizer (strangeEagle), and two big chips, which might be ROM, or RAM, or maybe a speech chip.zip]] (MHT Speech Synthesizer files for Eagle)* [[Media:Sp0256-al2-reversed-bit-order..? zip|SP0256-AL2 ROM]] ('''Despite of their filenames, these pictures probably do NOT show a speech synthesizer.caution''' Though with - the 3.5mm socketbytes in the file are in reversed bit-order, it may be some kind of audio output or audio input deviceie...?the "Target" values are unreversed, all other opcodes and parameters are reversed)
== Other CPC Speech Synthesizers ==
* [[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]]