Remind us again what cycles per frame setting is more/most “realistic” to best emulate older devices?
CHIP-8 on the COSMAC VIP ran at something resembling 7-15 cycles/frame and forced a vsync after every 'sprite' instruction, which places severe limits on maximum framerate in inverse proportion to the number of sprites being updated at any given time.
SCHIP on the HP-48 is closer to 20-30 cycles/frame.
The "normal" speed of XO-CHIP is 1000 cycles/frame, though it can be a satisfying challenge to create responsive programs in less.