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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'
how do the inputs work? is it modified to use joystick? is the sound cpu reading them / latching them via the AY?
if so how does it communicate, timing?
analog inputs seem to be read by the sound CPU, with serial communication
*/
@ -125,7 +124,7 @@ READ8_MEMBER(spyhuntertec_state::ay2_porta_r)
// read often, even if port is set to output mode
// maybe latches something?
// printf("ay2_porta_r\n");
return 0;
return rand();
}
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)
{
// printf("%04x spyhuntertec_fd00_w %02x\n", space.device().safe_pc(), data);
soundlatch_byte_w(space, 0, data);
m_audiocpu->set_input_line(INPUT_LINE_NMI, PULSE_LINE);
}
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();
// printf("%04x spyhuntertec_in2_r\n", space.device().safe_pc());
return ret;