Demo for Casio fx-9860G graphical calculators

What is it?

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The first ever demoscene release by KittenLabs. Written in C, released at Revision 2026

Tech internals

Audio playback through UART/Serial link port

• 19000Hz @ 8bit PCM, played using DMA-based PWM
• real ProTracker/Amiga 4-channel .mod playback
• fully async (interrupt-driven) playback, no main loop interaction required
• UART being driven in synchronous mode (without start/stop bits) to avoid distortion

Grayscale support through timer/interrupt-driven multiplexing

• 2-bit grayscale rendering

Overclocking through SH7305 CPG/PLL manipulation

• CPU clock -> 29 MHz -> 236 MHz
• Bus clock -> 29 MHz -> 118 MHz
• Battery current increases from ~1mA -> 110mA

Hardware requirements

Hitachi SH-4 CPU required! Won’t work on SH-3 CPUs!
SH-4 CPUs can be identified by software version “2.02.xxx” (instead of “2.01.xxx”)

Tested/developed on a (modded) fx-9750GII.

Might work on:

• fx-9860GII (only the SH-4 variants)
• fx-9860GIIs
• fx-9860G AU+ (australian model)
• Graph 35+E/75+/75+E
• Graph 35+/75/95 (only the SH-4 variants)

Graph 35+E have different displays (T6K11 rev. 2), untested, might glitch at start/crash.

Links

• Sourcecode: GitHub project
• .g1a binary: Release file
• demozoo