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r36784 Sunday 29th March, 2015 at 21:41:06 UTC by David Haywood
spider service mode trigger is non-obvious, document it (nw)
[src/mame/drivers]twins.c

trunk/src/mame/drivers/twins.c
r245295r245296
5252
5353Twins (set 2) is significantly changed hardware, uses a regular RAMDAC hookup for plaette etc.
5454
55To access Service Mode in Spider you must boot with P1 Left and P1 Right held down,
56this requires the -joystick_contradictory switch on the commandline.
5557
58
5659*/
5760
5861#include "emu.h"
r245295r245296
506509
507510   // game is only animating sprites at 30fps, maybe there's some double buffering too?
508511
512//  data written is always 00, only seems to want the upper layer to be cleared
513//  otherwise you get garbage sprites between rounds and the bg incorrectly wiped
514
509515   UINT16* vram;
510   if (m_videorambank & 1)
516//   if (m_videorambank & 1)
511517      vram = m_videoram2;
512   else
513      vram = m_videoram;
518//   else
519//      vram = m_videoram;
514520
515521   for (int i = 0; i < 0x8000; i++)
516522   {


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