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«The biggest problem is the fact that the high or low time of the signal driving the piezo element has to be a multiple of the instruction cycle time. This cycle time is nominally 155.6uS. So, for example TONE 9 has a three-instruction low and high time, giving a frequency of 1071Hz. TONE 8 has a four-instruction low and high time, giving a frequency of 803Hz. TONE 7 has a five-instruction low and high time, giving a frequency of 643Hz. These tones are individually coded. The remainder of the tones use a common routine to save code space. This common routine is 6+n instruction time long (for each phase of the piezo drive). And n is set by the TONE number as follows: TONE 6 has n=2, TONE 5 has n=4, and so on, down to TONE 0 with n=14. So, you could get better control at the low end of the frequency range, but it would take more code space. I guess that what they came up with was a reasonable compromise.»
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KEYBOARDLOCKY
KEYBOARDLOCKY
'Twas octal, and the synthetic codes
were scanned without a loss.
In and out of PRGM mode,
Byte-jumpers nybbled the CMOS.
«Beware 0 STO c, my son,
The MEMORY LOST, the keyboard lock.
Beware the NNN, and shun
The curious phase 1 clock.»
He took his black box codes in hand,
Long time the backwards goose he sought;
The secret beast from Aitchpee land--
All searches came to nought.
In demented thought he stood, and then:
The goose, with LCD's alight,
A leap for every LBL 10,
Came honking left-to-right!
STO b! STO d!, and RCL P!
His keyboard went clickety-clack.
With the proper code in number mode
The goose came flapping back.
«And hast thou found the phantom fowl?
Come to my arms, my binary boy.
Let Corvallis hear us howl
As we chortle in our joy!»
'Twas octal, and the synthetic codes
Were scanned without a loss.
In and out of PRGM mode,
Byte-jumpers nybbled the CMOS.
--Apologies to Lewis Carroll
'Twas octal, and the synthetic codes
were scanned without a loss.
In and out of PRGM mode,
Byte-jumpers nybbled the CMOS.
«Beware 0 STO c, my son,
The MEMORY LOST, the keyboard lock.
Beware the NNN, and shun
The curious phase 1 clock.»
He took his black box codes in hand,
Long time the backwards goose he sought;
The secret beast from Aitchpee land--
All searches came to nought.
In demented thought he stood, and then:
The goose, with LCD's alight,
A leap for every LBL 10,
Came honking left-to-right!
STO b! STO d!, and RCL P!
His keyboard went clickety-clack.
With the proper code in number mode
The goose came flapping back.
«And hast thou found the phantom fowl?
Come to my arms, my binary boy.
Let Corvallis hear us howl
As we chortle in our joy!»
'Twas octal, and the synthetic codes
Were scanned without a loss.
In and out of PRGM mode,
Byte-jumpers nybbled the CMOS.
--Apologies to Lewis Carroll
MCODE
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