The 7800 Minnie sound chip - Revision history

MSaarna at 00:54, 7 January 2026

2026-01-07T00:54:54Z

2021-03-05T18:04:27Z

2021-03-04T21:48:28Z

2021-03-04T21:18:19Z

2021-03-04T21:17:56Z

‎Capability Overview

2021-03-04T21:17:29Z

‎Capability Overview

2021-03-04T20:58:50Z

2021-03-04T20:58:22Z

2021-03-04T20:57:01Z

2021-03-04T20:56:40Z

‎Capability Overview

← Older revision		Revision as of 00:54, 7 January 2026
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	==Introduction==		==Introduction==

		+	[[File:Minnie_die_shot_01.jpg\|thumb\|A die shot of the Minnie prototype]]
	Minnie (GCC 1730) was a soundchip designed by GCC as an in-cart audio solution for the 7800 console.		Minnie (GCC 1730) was a soundchip designed by GCC as an in-cart audio solution for the 7800 console.

← Older revision		Revision as of 18:04, 5 March 2021
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	The Minnie and TIA audio was summed together, which added another 2 voices to the system, suitable for sound effects and percussion effects.		The Minnie and TIA audio was summed together, which added another 2 voices to the system, suitable for sound effects and percussion effects.

−	~~Similar to other contemporary sound chips,~~ Minnie relied on the CPU to adjust volume for achieving sound envelopes. This would have commonly occurred once per frame, along with any other sound parameter adjustments desired.	+	Minnie relied on the CPU to adjust volume for achieving sound envelopes. This would have commonly occurred once per frame, along with any other sound parameter adjustments desired.

@@ Line 10: / Line 10: @@
 ==Capability Overview==
-The Minnie design is quite unique compared to other contemporary sound chips. The synthesis technique employed is Digital Wave Synthesis, where sample data is used to represent one cycle of the sound. There  were two rows of sample data and 3 predefined waveforms, so the chip could also be driven in a Wavetable Synthesis fashion.
+The Minnie design is quite unique compared to other contemporary sound chips. The synthesis technique employed is Digital Wave Synthesis, where sample data is used to represent one cycle of the sound. There  were two rows of sample data and 3 predefined waveform rows, so the chip could also be driven in a Wavetable Synthesis fashion.
 Adjustable sound parameters include very fine-grained volume and frequency controls, and a noise parameter. The noise parameter could be used to adjust the wave phase of any of the voices in varying levels, achieving modulation effects ranging from slight frequency instability through to pitched noise.

← Older revision		Revision as of 21:18, 4 March 2021
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	Similar to other contemporary sound chips, Minnie relied on the CPU to adjust volume for achieving sound envelopes. This would have commonly occurred once per frame, along with any other sound parameter adjustments desired.		Similar to other contemporary sound chips, Minnie relied on the CPU to adjust volume for achieving sound envelopes. This would have commonly occurred once per frame, along with any other sound parameter adjustments desired.
		+

	==The GCC Minnie Documentation==		==The GCC Minnie Documentation==

@@ Line 10: / Line 10: @@
 ==Capability Overview==
-The Minnie design is quite unique compared to other contemporary sound chips. The synthesis technique employed is Digital Wave Synthesis, where sample data is used to represent one cycle of the sound. There  were two rows of sample data and 3 predefined waveforms, so the chip could also be driven in a Wavetable Synthesizer fashion.
+The Minnie design is quite unique compared to other contemporary sound chips. The synthesis technique employed is Digital Wave Synthesis, where sample data is used to represent one cycle of the sound. There  were two rows of sample data and 3 predefined waveforms, so the chip could also be driven in a Wavetable Synthesis fashion.
 Adjustable sound parameters include very fine-grained volume and frequency controls, and a noise parameter. The noise parameter could be used to adjust the wave phase of any of the voices in varying levels, achieving modulation effects ranging from slight frequency instability through to pitched noise.

@@ Line 21: / Line 21: @@
 * 2 arbitrary 64-byte waveforms stored in on-chip ROM, which could differ per-game
 * 3 standard waveforms: triangle, square, sawtooth
 The Minnie and TIA audio was summed together, which added another 2 voices to the system, suitable for sound effects and percussion effects.

@@ Line 22: / Line 22: @@
 * 3 standard waveforms: triangle, square, sawtooth
-The Minnie and TIA audio was summed together, which added another 2 voices suitable for sound effects and percussion effects.
+The Minnie and TIA audio was summed together, which added another 2 voices to the system, suitable for sound effects and percussion effects.
 Similar to other contemporary sound chips, Minnie relied on the CPU to adjust volume for achieving sound envelopes. This would have commonly occurred once per frame, along with any other sound parameter adjustments desired.

← Older revision		Revision as of 20:57, 4 March 2021
Line 25:		Line 25:

	Similar to other contemporary sound chips, Minnie relied on the CPU to adjust volume for achieving sound envelopes. This would have commonly occurred once per frame, along with any other sound parameter adjustments desired.		Similar to other contemporary sound chips, Minnie relied on the CPU to adjust volume for achieving sound envelopes. This would have commonly occurred once per frame, along with any other sound parameter adjustments desired.
		+

	==The GCC Minnie Documentation==		==The GCC Minnie Documentation==