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zac1b1120.cpp: More notes

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AJR 2023-07-11 11:18:39 -04:00
parent 888b12f291
commit b8a0c02402
1 changed files with 8 additions and 0 deletions
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src/mame/zaccaria/zac1b1120.cpp
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@ -13,6 +13,13 @@
* leave the battery unpopulated (Invaders schematics say "OMIT") and place a * leave the battery unpopulated (Invaders schematics say "OMIT") and place a
* 2101 RAM there instead. * 2101 RAM there instead.
* *
* Sound on these games is generated partly by the 2636 and partly by a
* daughterboard containing discrete components, TTL logic, and a SN76477
* (The Invaders only).
*
* A later revision of The Invaders, apparently cocktail only, runs on a single
* board labeled 1B1124/1. The discrete sound hardware is different here again.
*
* *
* TODO: discrete sound * TODO: discrete sound
* *
@ -443,6 +450,7 @@ INPUT_PORTS_END
void zac1b1120_state::palette(palette_device &palette) const void zac1b1120_state::palette(palette_device &palette) const
{ {
// FIXME: this PCB actually outputs RGB signals, not monochrome video!
palette.set_pen_color(0, rgb_t::black()); palette.set_pen_color(0, rgb_t::black());
palette.set_pen_color(1, rgb_t::white()); palette.set_pen_color(1, rgb_t::white());
palette.set_pen_color(2, rgb_t::black()); palette.set_pen_color(2, rgb_t::black());