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Interrupt brings up Monitor: working, but calling "run" leaves garbage in the SP

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Daniele Verducci (ZenPenguin)
2021-01-03 09:37:22 +01:00
parent b98ad3e136
commit 08b32b2064
3 changed files with 32 additions and 41 deletions
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9
pat80-computer/software/z80-assembly/os/main.asm
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@ -21,9 +21,14 @@ jp Sysinit ; Startup vector: DO NOT MOVE! Must be the first instruction
; **** RESET/INTERRUPT VECTOR ****
; Maskable interrupt mode 1: execute memory monitor
; Maskable interrupt mode 1: when the BREAK key is pressed,
; a maskable interrupt is generated and the CPU jumps to this address.
; In this way, BREAK key brings up memory monitor at any time.
ds 0x38
call Monitor_main
di ; Disable maskable interrupts.
exx ; exchange registers
ex af, af'
jp Monitor_main
; **** SYSTEM CALLS ****
; System calls provide access to low level functions (input from keyboard, output to screen etc).