Software › Sound Demo (GG demo)
Sound Demo (GG demo)
A tiny hand-written Z80 program for the Sega Game Gear, authored for emulators.org and released into the public domain. It brings the Mode-4 VDP up to a visible state, paints the whole screen red by writing colour-RAM entry 0, then programs the SN76489 PSG through port 0x7F — exactly as on the Master System, since the Game Gear is SMS hardware in a handheld shell — to play a short ascending four-note loop (C5-E5-G5-C6) on tone channel 0 at full volume. It drives the sound chip directly, so it plays as soon as the Sound button un-mutes it. A clean, readable debugger target: single-step the Z80 through the PSG writes, or watchpoint the note table.
Format: Sega Game Gear cartridge (.gg) · By: emulators.org · Licence: Public domain
Runs on
Preview
Full file (95 bytes) — offset, bytes, ASCII.
00000000 F3 ED 56 31 F0 DF 21 54 00 0E 00 06 0B 7E D3 BF ..V1..!T.....~..
00000010 23 79 F6 80 D3 BF 0C 10 F4 AF D3 BF 3E C0 D3 BF #y..........>...
00000020 3E 0F D3 BE 3E 00 D3 BE 3E 90 D3 7F 21 4B 00 7E >...>...>...!K.~
00000030 FE FF 28 F8 D3 7F 23 7E D3 7F 23 CD 40 00 18 EF ..(...#~..#.@...
00000040 16 30 1E 00 1D 20 FD 15 20 F8 C9 86 0D 8A 0A 8F .0... .. .......
00000050 08 8B 06 FF 04 C0 FF FF FF FF FF 00 00 00 FF ...............