dennisgunia/Z8C-Homebrew-Computer
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

progress on FAT16 support

Browse Source
This commit is contained in:
Dennis Gunia
2024-01-12 13:29:20 +01:00
parent ee2f22df09
commit 507eb3a017
40 changed files with 19699 additions and 6346 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
OperatingSystem/monitor_v2/include/beep.s
View File

@@ -6,33 +6,32 @@
;------------------------------------------------------------------------------
beep:
push AF
push BC
push DE
beep_loop:
LD A,0x08
OUT (CS_PIO_AD), A
LD BC, 0x28
CALL beep_pause
LD A,0x00
OUT (CS_PIO_AD), A
LD BC, 0x24
CALL beep_pause
DEC DE
ld A,D
or E
jr NZ, beep_loop
pop de
pop bc
pop af
ret
beep_pause:
NEG ; 8 T-states
NEG ; 8 T-states
PUSH BC
_beep_pause_l1:
;NEG ; 8 T-states
;NEG ; 8 T-states
NEG ; 8 T-states
NEG ; 8 T-states
DEC BC ; 6 T-states
LD A,C ; 9 T-states
OR B ; 4 T-states
JP NZ,beep_pause ; 10 T-states
JP NZ,_beep_pause_l1 ; 10 T-states
POP BC
RET ; Pause complete, RETurn