Difference between revisions of "MHT Speech Synthesizer"

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<gallery caption="MHT Speech">
 
<gallery caption="MHT Speech">
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File:MHT-sintetizdor_de_voz-001.jpg|Outside
 
File:MHT-sintetizdor_de_voz-001.jpg|Outside
 
File:MHT-sintetizdor_de_voz-003.jpg|Inside
 
File:MHT-sintetizdor_de_voz-003.jpg|Inside
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File:NoPicture.gif|Part number on GI chip
 
File:NoPicture.gif|Part number on GI chip
 
File:NoPicture.gif|Part number on oscillator
 
File:NoPicture.gif|Part number on oscillator
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</gallery>
 
</gallery>
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<gallery caption="MHT Speech Synthesizer Layout, thanks to Jose Leandro">
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File:MHT Speech Synthesizer - PCB Front.png|PCB Front
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File:MHT Speech Synthesizer - PCB Back.png|PCB Back
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File:MHT Speech Synthesizer - PCB Chips.png|PCB Chips
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File:MHT Speech Synthesizer - PCB Complete.png|PCB Complete
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File:MHT Speech Synthesizer - Layout.png|Layout
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</gallery>
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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 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).
 
The GNDed pins somewhat confirm that it is a SP0256 (Pin1=Supply GND, Pin10,11=A8,A9, ie. only 6bit allophone numbers used).

Revision as of 20:42, 6 March 2014


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).

Port ????h READ: 

 bit?   Status 1 (0=Speech Busy, 1=Ready/Halted)   (SBY Pin, Speech Busy)
 bit?   Status 2 (0=Ready to Receive Data, 1=Busy) (/LRQ Pin, Load Request)
 bit?-? Not used (garbage, probably usually highz)

Port ????h WRITE: 

 bit7-6 Reserved (should be be zero, though SP0256 Pins10-11 are GNDed)
 bit5-0 Allophone number               ;data can be send when Status.Bit?=0

Supported software

  • No (known) software?

Pictures

  • MHT Speech

  • Outside

  • Inside

  • Component Side

  • Solder Side

  • Part number on GI chip

  • Part number on oscillator

  • MHT Speech Synthesizer Layout, thanks to Jose Leandro

  • PCB Front

  • PCB Back

  • PCB Chips

  • PCB Complete

  • Layout


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.

Downloads

  • No included driver/sample program...?
  • 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

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