Lovebyte 2025 Apple II sizecoded Demos

Background

Source Code

The Entries

Oldschool 256B -- Heartbeat

Mockingboard bytebeat with Lo-res graphics. You'll need a Mockingboard in Slot #4, also note music only comes out the left channel.

As with my "purple beat" atari 2600 intro, the music code is based on Tjoppen's 128 byte Atari 2600 code, a variant of viznut's combo of xpansive's and varjohukka's work on pouet. It's using the bytebeat code:

(t>>7|t|t>>6)*10+4*(t&t>>13|t>>6)

The Mockingboard us being used as a 4-bit DAC here. When you disable a channel it floats high, but the volume registers still work. So to update sound at 8kHz you just have to write the proper volume register every 128 cycles or so (and remember that the amplitude registers are logarithmic on the AY-3-8910).

It took me a while to figure out how to get the visualization with the heart, I kept thinking up complex ways, but then in the end realized I could just do a bunch of VLIN calls.

Finish: 9/24 256 Byte Oldschool Intro
Download:

Oldschool 128B -- Triscroll

128-byte Intro for Apple II with some nice sound. This was sort of compo-filler trying to qualify for the byteathlon but I really like how the "music" turned out. It's just clicking the speaker during the drawing routines but I think it turned out nice. The graphics are an outtake from a failed attempt at a hi-res parallax effect that I thought looked vaguely cool.

Finish: 13/17 128 Byte Oldschool Intro
Video:

64B Intro -- blackhole

Two hi-res XDRAW shapetables, one for the vaguely circuit or pasta like pattern, then a growing blackhole with an ominous sound.

Finish: 4/14 Oldschool 64-byte Intro
Video:

CALL -151
E7:  20 D8 F3 84 E4 20 57 F4  A9 06 A0 E2 A2 E3 20 5D
F7:  F6 E6 E9 A5 E9 C9 29 D0  EF E8 86 E7 A4 E7 C0 1C
107: F0 E1 A8 A2 8C A9 60 20  11 F4 A2 E0 A0 E2 E6 E8
117: A5 E8 29 3F D0 02 E6 E7  2C 30 C0 20 01 F6 F0 DC
E7G

32B Intro -- Mad Compute

This one is actually only 31 bytes.

Finish: 15/21 Oldschool 32-byte Intro
Download:

CALL -151
E7: 05 EA 20 D8 F3 20 57 F4  A6 D4 2C 30 C0 A4 27 88
F7: D0 FD CA D0 F5 8A A0 E2  A2 E3 20 5D F6 F0 E9
E7G