From b8a0c02402ee5e5de99f88f13550c5961a35e1d4 Mon Sep 17 00:00:00 2001 From: AJR Date: Tue, 11 Jul 2023 11:18:39 -0400 Subject: zac1b1120.cpp: More notes --- src/mame/zaccaria/zac1b1120.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/src/mame/zaccaria/zac1b1120.cpp b/src/mame/zaccaria/zac1b1120.cpp index 03d1dbcc1b1..131830c08a7 100644 --- a/src/mame/zaccaria/zac1b1120.cpp +++ b/src/mame/zaccaria/zac1b1120.cpp @@ -13,6 +13,13 @@ * leave the battery unpopulated (Invaders schematics say "OMIT") and place a * 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 * @@ -443,6 +450,7 @@ INPUT_PORTS_END 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(1, rgb_t::white()); palette.set_pen_color(2, rgb_t::black()); -- cgit v1.2.3