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audio/mw8080bw.cpp: added some notes deriving from comparison between driver and original Taito Space Invaders PCB [Guru]

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Ivan Vangelista 2021-08-12 07:00:47 +02:00 committed by GitHub
parent 79e4e21eae
commit b5926fe24f
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1 changed files with 3 additions and 3 deletions
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src/mame/audio/mw8080bw.cpp
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@ -324,7 +324,7 @@ discrete_op_amp_1sht_info const invaders_missle_1sht =
RES_M(1), // R31
RES_M(1), // R33
RES_M(2.2), // R34
CAP_U(1), // C12
CAP_U(1), // C12, CAP_U(0.22) on Taito PCB
CAP_P(470), // C15
0, // vN
12 // vP
@ -344,14 +344,14 @@ discrete_op_amp_info const invaders_missle_op_amp_B3 =
discrete_op_amp_osc_info const invaders_missle_op_amp_osc =
{
DISC_OP_AMP_OSCILLATOR_VCO_3 | DISC_OP_AMP_IS_NORTON | DISC_OP_AMP_OSCILLATOR_OUT_SQW,
DISC_OP_AMP_OSCILLATOR_VCO_3 | DISC_OP_AMP_IS_NORTON | DISC_OP_AMP_OSCILLATOR_OUT_SQW, // DISC_OP_AMP_OSCILLATOR_VCO_3 doesn't fully represent the actual circuit on a Taito PCB, missile sound is off
1.0 / (1.0 / RES_M(1) + 1.0 / RES_K(330)) + RES_M(1.5), // R29||R11 + R12
RES_M(1), // R16
RES_K(560), // R17
RES_M(2.2), // R19
RES_M(1), // R16
RES_M(4.7), // R14
RES_M(3.3), // R13
RES_M(3.3), // R13, RES_M(2.2) on Taito PCB
0, // no r8
CAP_P(330), // C58
12, // vP