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@opt stack_pointer RG
@opt csr_scratch RH
@use ext_std:*
@let vector_table 0x10
@let vt_ISR0 0x10
@let vt_ISR1 0x11
@let vt_ISR2 0x12
@let vt_ISR3 0x13
@let vt_stack_addr 0x14
@let vt_term_pp_addr 0x15
@let vt_kb_pp_addr 0x16
@let vt_gr_mode_addr 0x17
@let vt_sprite_mem 0x18
@let vt_text_mem 0x19
@let stack_segment 0x8000
@let mmio_segment 0xE000
@let terminal_addr 0xE000
@let keyboard_addr 0xE001
@let gr_mode_addr 0xE002
@let sprite_mem 0xE800
@let text_mem 0xF800
@let gr_disabled_mode 0b00
@let gr_text_mode 0b01
@let gr_sprite_mode 0b10
@address 0x0
ldi vt_stack_addr RA
ldr RA SP
jpi program_segment
@address vector_table
keyboard_isr
hlt_isr
hlt_isr
hlt_isr
stack_segment
terminal_addr
keyboard_addr
gr_mode_addr
sprite_mem
text_mem
@label hlt_isr
ldi 0x55 RE
hlt
@label keyboard_isr
spu RA
spu RB
ldi vt_kb_pp_addr RA
ldr RA RA
ldr RA RA
ldi vt_term_pp_addr RB
ldr RB RB
str RA RB
spo RB
spo RA
rti
@label program_segment
ldi vt_gr_mode_addr RA
ldr RA RA
ldi gr_disabled_mode RB
str RB RA
jpi main
@label func
addi SP 1 SP
ldi ${SP - 3} RA
ldr RA RA
ldi ${SP - 1} RB
str RA RB
ldi ${SP - 1} RA
ldr RA RA
ldi ${SP - 1} RB
ldr RB RB
add RA RB RA
spu RA
subi SP 1 SP
rsr
@label main
addi SP 1 SP
ldi 1 RA
spu RA
ldi 3 RA
spu RA
csi func
spo RA
ldi ${SP - 1} RB
str RA RB
subi SP 1 SP
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