Quoted from frenchmarky:
But the noise also disappears at the moment boot up is complete, i.e. start of attract, before and without any sound effects or speech being generated at all by the attract speech kicking in or coin switches, correct?
When this problem occurs, these are the only things that will stop it...
attract mode kicks in, if attract enabled
• add a credit
• start a game
• turn off the machine
If I were to disable attract mode, then this errant phoneme would continue indefinitely or until one of the other actions take place. When attract mode is set to 2 minutes, the errant phoneme continues for 2 minutes. When attract mode is set to 10 seconds, the phoneme continues for 10 seconds... it continues until the attract sounds start. EDIT: attract mode was ignored today... I had to start a game to get it to stop.
At one point a month or two ago, I don't remember what I did or was doing, but the errant phoneme was stopping all by itself fairly quickly after it started. This was temporary, like only for one day it was like that.
Quoted from frenchmarky:
There is a note in the description of their Speech Pac application of the chip of how if certain things don't happen when they should the SC01 can remain 'stuck' on one phenome. 'Remains stuck' seems to imply it keeps repeating it.
It's the only thing in the document that mentions a "stuck" phoneme. After reading about how this chip generates 64 different phonemes, it's really curious how mine is always triggering or getting stuck on one.
I need to absorb this information to understand better...
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So confusing... the quoted section is talking about the SPEECH-PAC™ "Load Line" ... it's entirely unclear how we go from the SC-01 chip data-sheet to a complete stand alone circuit called Speech-Pac in this document. And since the A6 only uses the SC-01 chip, I'm not sure how relevant the pages dealing with Speech-Pac are to this.
Page 11 talks about a "figure 2" schematic but the circuits on page 10 are labeled figures 6, 7, 8, and 9 and contain a SC-01A, which is a totally different chip. The description mentions edge connector J1, which is not shown on any of the circuits. I think this PDF was cobbled together from various bits and pieces, and it's missing something critical.
The "stuck phoneme" is a huge clue but without the relevant information about Speech-Pac back to SC-01, not SC-01A, I don't know what to make of it.
I found another PDF online for the SC-01 and it's the same but stops on page 9 - only contains SC-01 data-sheet and nothing about Speech-Pac.