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notes about inputs (nw)

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This commit is contained in:
David Haywood 2016-03-28 13:16:08 +01:00
parent b8d22b6c90
commit b2ee87f136
1 changed files with 18 additions and 3 deletions
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21
src/mame/drivers/spyhuntertec.cpp
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@ -15,8 +15,7 @@ non-interlaced
sound system appears to be the same as 'spartanxtec.cpp' sound system appears to be the same as 'spartanxtec.cpp'
how do the inputs work? is it modified to use joystick? is the sound cpu reading them / latching them via the AY? analog inputs seem to be read by the sound CPU, with serial communication
if so how does it communicate, timing?
*/ */
@ -125,7 +124,7 @@ READ8_MEMBER(spyhuntertec_state::ay2_porta_r)
// read often, even if port is set to output mode // read often, even if port is set to output mode
// maybe latches something? // maybe latches something?
// printf("ay2_porta_r\n"); // printf("ay2_porta_r\n");
return 0; return rand();
} }
WRITE8_MEMBER(spyhuntertec_state::spyhunt_videoram_w) WRITE8_MEMBER(spyhuntertec_state::spyhunt_videoram_w)
@ -310,12 +309,28 @@ UINT32 spyhuntertec_state::screen_update_spyhuntertec(screen_device &screen, bit
WRITE8_MEMBER(spyhuntertec_state::spyhuntertec_fd00_w) WRITE8_MEMBER(spyhuntertec_state::spyhuntertec_fd00_w)
{ {
// printf("%04x spyhuntertec_fd00_w %02x\n", space.device().safe_pc(), data);
soundlatch_byte_w(space, 0, data); soundlatch_byte_w(space, 0, data);
m_audiocpu->set_input_line(INPUT_LINE_NMI, PULSE_LINE); m_audiocpu->set_input_line(INPUT_LINE_NMI, PULSE_LINE);
} }
READ8_MEMBER(spyhuntertec_state::spyhuntertec_in2_r) READ8_MEMBER(spyhuntertec_state::spyhuntertec_in2_r)
{ {
// it writes 04 / 14 to the sound latch (spyhuntertec_fd00_w) before
// reading bit 6 here a minimum of 32 times.
// seems to be how it reads the analog controls? probably via sound CPU??
/* note, these commands trigger a read from ay2_porta on the sound cpu side, followed by 2 writes
a52a spyhuntertec_fd00_w 14
ay2_porta_r
ay2_porta_w 80
ay2_porta_w 00
a52a spyhuntertec_fd00_w 04
ay2_porta_r
ay2_porta_w 81
ay2_porta_w 01
*/
UINT8 ret = ioport("IN2")->read(); UINT8 ret = ioport("IN2")->read();
// printf("%04x spyhuntertec_in2_r\n", space.device().safe_pc()); // printf("%04x spyhuntertec_in2_r\n", space.device().safe_pc());
return ret; return ret;