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spider service mode trigger is non-obvious, document it (nw)

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mamehaze 2015-03-29 22:41:06 +01:00
parent 47ab93edd2
commit 3ef319f0af
1 changed files with 9 additions and 3 deletions
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12
src/mame/drivers/twins.c
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@ -52,6 +52,9 @@ It is possible the Twins PCB has them too and doesn't use them.
Twins (set 2) is significantly changed hardware, uses a regular RAMDAC hookup for plaette etc.
To access Service Mode in Spider you must boot with P1 Left and P1 Right held down,
this requires the -joystick_contradictory switch on the commandline.
*/
@ -506,11 +509,14 @@ WRITE16_MEMBER(twins_state::spider_port_1c_w)
// game is only animating sprites at 30fps, maybe there's some double buffering too?
// data written is always 00, only seems to want the upper layer to be cleared
// otherwise you get garbage sprites between rounds and the bg incorrectly wiped
UINT16* vram;
if (m_videorambank & 1)
// if (m_videorambank & 1)
vram = m_videoram2;
else
vram = m_videoram;
// else
// vram = m_videoram;
for (int i = 0; i < 0x8000; i++)
{