CERES-16

a shitty fantasy console written in rust using a proprietary MIPS based asm instruction set. a lot of inspiration from PICO-8. ceres is structured of these crates:

• ceres-sys: the core system structure of ceres-16
• ceres-asm: the assembler for ceres-16

Graphics

ceres uses a 256x144 screen with a separate video buffer from the standard memory. colors are 16-bit structured like 0b0000_rrrr_gggg_bbbb where the first four bits are ignored. the video buffer is structured row major where each u16 is an individual pixel

Register layout and info

all registers are unsigned 16 bit

Register number	Register name	Register usage
0	z0	always contains zero
1	pc	program counter
2	sp	stack pointer
3	ra	return address
4-6	a0-a2	argument registers
7	v0	return register
8	v1	return register 2
9-15	t0-t6	temporary registers

Memory map and info

god oh fuck what am i even doing

instructions

load - ld:signifier

can be vram/cram/imed

• immediate ld:immd $dest immediate

  opcode	signifier	destination	padding	immediate
  00001	100	0000	0000	0000000000000000