File:Apu address.jpg: Difference between revisions
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(The NES APU's address decoder, generating enables for all reads/writes within $4000-$401F. Of very special note are the 4 signals at the very top for readable registers at $4018 (pulse 0 output on D0-D3 and pulse 1 output on D4-D7), $4019 (triangle outpu) |
m (anybody capable of interpreting these images is welcome to figure out how to enable these extra registers...) |
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Of very special note are the 4 signals at the very top for readable registers at $4018 (pulse 0 output on D0-D3 and pulse 1 output on D4-D7), $4019 (triangle output on D0-D3, noise output on D4-D7), $401A (DPCM output on D0-D6), and a writable register at $401A (purpose unknown); all 4 of these signals have an additional enable which seems to come from the vicinity of [[CPU pin out and signal description|pin 30]]. | Of very special note are the 4 signals at the very top for readable registers at $4018 (pulse 0 output on D0-D3 and pulse 1 output on D4-D7), $4019 (triangle output on D0-D3, noise output on D4-D7), $401A (DPCM output on D0-D6), and a writable register at $401A (purpose unknown); all 4 of these signals have an additional enable which seems to come from the vicinity of [[CPU pin out and signal description|pin 30]]. | ||
Source: http://uxul.org/~noname/chips/cpu-5/stitched/final/ http://uxul.org/~noname/chips/cpu-2/no-metal/stitched/final/ | |||
Revision as of 15:31, 24 January 2011
The NES APU's address decoder, generating enables for all reads/writes within $4000-$401F.
Of very special note are the 4 signals at the very top for readable registers at $4018 (pulse 0 output on D0-D3 and pulse 1 output on D4-D7), $4019 (triangle output on D0-D3, noise output on D4-D7), $401A (DPCM output on D0-D6), and a writable register at $401A (purpose unknown); all 4 of these signals have an additional enable which seems to come from the vicinity of pin 30.
Source: http://uxul.org/~noname/chips/cpu-5/stitched/final/ http://uxul.org/~noname/chips/cpu-2/no-metal/stitched/final/
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| current | 21:56, 21 September 2021 |  | 1,314 × 400 (294 KB) | >Maintenance script | == Summary == Importing file |
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