mirror of
https://github.com/deater/dos33fsprogs.git
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pt3_lib: update the detection code
This commit is contained in:
Vince Weaver
parent
d0c87370c8
commit
4f89601053
@ -23,7 +23,7 @@ PT3_TEST: pt3_test.o
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pt3_test.o: pt3_test.s \
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pt3_lib_init.s pt3_lib_core.s pt3_lib_irq_handler.s \
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pt3_lib_mockingboard.s \
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pt3_lib_mockingboard_detect.s pt3_lib_mockingboard_setup.s \
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interrupt_handler.s zp.inc
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ca65 -o pt3_test.o pt3_test.s -l pt3_test.lst
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#
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196
pt3_lib/pt3_lib_mockingboard_detect.s
Normal file
196
pt3_lib/pt3_lib_mockingboard_detect.s
Normal file
@ -0,0 +1,196 @@
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;===================================================================
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; code to detect mockingboard
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;===================================================================
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; this isn't always easy
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; my inclination is to just assume slot #4 but that isn't always realistic
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; code below based on "hw.mockingboard.a" from "Total Replay"
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;license:MIT
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; By Andrew Roughan
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; in the style of 4am for Total Replay
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;
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; Mockingboard support functions
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;
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;------------------------------------------------------------------------------
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; HasMockingboard
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; detect Mockingboard card by searching for 6522 timers across all slots
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; access 6522 timers with deterministic cycle counts
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;
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; based on prior art in Mockingboard Developers Toolkit
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; with optimisation from deater/french touch
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; also takes into account FastChip //e clock difference
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;
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; in: none
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; accelerators should be off
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; out: C set if Mockingboard found in any slot
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; if card was found, X = #$Cn where n is the slot number of the card
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; C clear if no Mockingboard found
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; other flags clobbered
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; zp $85-$87 clobbered
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; A/Y clobbered
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;------------------------------------------------------------------------------
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mockingboard_detect:
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lda #$00
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sta MB_ADDR_L
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ldx #$C7 ; start at slot #7
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mb_slot_loop:
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stx MB_ADDR_H
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ldy #$04 ; 6522 #1 $Cx04
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jsr mb_timer_check
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bne mb_next_slot
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ldy #$84 ; 6522 #2 $Cx84
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jsr mb_timer_check
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bne mb_next_slot
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mb_found:
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sec ; found
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rts
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mb_next_slot:
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dex
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cpx #$C0
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bne mb_slot_loop
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clc ; not found
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rts
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mb_timer_check:
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lda (MB_ADDR_L),Y ; read 6522 timer low byte
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sta MB_VALUE
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lda (MB_ADDR_L),Y ; second time
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sec
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sbc MB_VALUE
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cmp #$F8 ; looking for (-)8 cycles between reads
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beq mb_timer_check_done
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cmp #$F7 ; FastChip //e clock is different
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mb_timer_check_done:
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rts
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.if 0
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;=======================================
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; Detect a Mockingboard card
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;=======================================
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; Based on code from the French Touch "Pure Noise" Demo
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; Attempts to time an instruction sequence with a 6522
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;
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; If found, puts in bMB
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; MB_ADDRL:MB_ADDRH has address of Mockingboard
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; returns X=0 if not found, X=1 if found
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mockingboard_detect:
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lda #0
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sta MB_ADDRL
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mb_detect_loop: ; self-modifying
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lda #$07 ; we start in slot 7 ($C7) and go down to 0 ($C0)
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ora #$C0 ; make it start with C
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sta MB_ADDRH
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ldy #04 ; $CX04
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ldx #02 ; 2 tries?
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mb_check_cycle_loop:
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lda (MB_ADDRL),Y ; timer 6522 (Low Order Counter)
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; count down
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sta PT3_TEMP ; 3 cycles
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lda (MB_ADDRL),Y ; + 5 cycles = 8 cycles
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; between the two accesses to the timer
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sec
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sbc PT3_TEMP ; subtract to see if we had 8 cycles
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cmp #$f8 ; -8
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bne mb_not_in_this_slot
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dex ; decrement, try one more time
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bne mb_check_cycle_loop ; loop detection
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inx ; Mockingboard found (X=1)
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done_mb_detect:
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;stx bMB ; store result to bMB
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rts ; return
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mb_not_in_this_slot:
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dec mb_detect_loop+1 ; decrement the "slot" (self_modify)
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bne mb_detect_loop ; loop down to one
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ldx #00
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beq done_mb_detect
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;alternative MB detection from Nox Archaist
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; lda #$04
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; sta MB_ADDRL
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; ldx #$c7
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;
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;find_mb:
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; stx MB_ADDRH
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;
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; ;detect sound I
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;
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; sec
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; ldy #$00
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; lda (MB_ADDRL), y
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; sbc (MB_ADDRL), y
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; cmp #$05
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; beq found_mb
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; dex
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; cpx #$c0
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; bne find_mb
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; ldx #$00 ;no mockingboard found
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; rts
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;
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;found_mb:
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; ldx #$01 ;mockingboard found
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; rts
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;
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; ;optionally detect sound II
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;
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; sec
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; ldy #$80
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; lda (MB_ADDRL), y
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; sbc (MB_ADDRL), y
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; cmp #$05
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; beq found_mb
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;=======================================
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; Detect a Mockingboard card in Slot4
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;=======================================
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; Based on code from the French Touch "Pure Noise" Demo
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; Attempts to time an instruction sequence with a 6522
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;
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; MB_ADDRL:MB_ADDRH has address of Mockingboard
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; returns X=0 if not found, X=1 if found
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mockingboard_detect_slot4:
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lda #0
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sta MB_ADDRL
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mb4_detect_loop: ; self-modifying
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lda #$04 ; we're only looking in Slot 4
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ora #$C0 ; make it start with C
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sta MB_ADDRH
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ldy #04 ; $CX04
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ldx #02 ; 2 tries?
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mb4_check_cycle_loop:
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lda (MB_ADDRL),Y ; timer 6522 (Low Order Counter)
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; count down
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sta PT3_TEMP ; 3 cycles
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lda (MB_ADDRL),Y ; + 5 cycles = 8 cycles
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; between the two accesses to the timer
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sec
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sbc PT3_TEMP ; subtract to see if we had 8 cycles
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cmp #$f8 ; -8
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bne mb4_not_in_this_slot
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dex ; decrement, try one more time
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bne mb4_check_cycle_loop ; loop detection
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inx ; Mockingboard found (X=1)
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done_mb4_detect:
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rts ; return
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mb4_not_in_this_slot:
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ldx #00
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beq done_mb4_detect
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.endif
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@ -121,129 +121,11 @@ clear_ay_left_loop:
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bpl clear_ay_left_loop
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rts
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;=======================================
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; Detect a Mockingboard card
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;=======================================
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; Based on code from the French Touch "Pure Noise" Demo
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; Attempts to time an instruction sequence with a 6522
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;
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; If found, puts in bMB
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; MB_ADDRL:MB_ADDRH has address of Mockingboard
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; returns X=0 if not found, X=1 if found
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mockingboard_detect:
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lda #0
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sta MB_ADDRL
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mb_detect_loop: ; self-modifying
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lda #$07 ; we start in slot 7 ($C7) and go down to 0 ($C0)
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ora #$C0 ; make it start with C
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sta MB_ADDRH
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ldy #04 ; $CX04
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ldx #02 ; 2 tries?
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mb_check_cycle_loop:
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lda (MB_ADDRL),Y ; timer 6522 (Low Order Counter)
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; count down
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sta PT3_TEMP ; 3 cycles
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lda (MB_ADDRL),Y ; + 5 cycles = 8 cycles
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; between the two accesses to the timer
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sec
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sbc PT3_TEMP ; subtract to see if we had 8 cycles
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cmp #$f8 ; -8
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bne mb_not_in_this_slot
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dex ; decrement, try one more time
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bne mb_check_cycle_loop ; loop detection
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inx ; Mockingboard found (X=1)
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done_mb_detect:
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;stx bMB ; store result to bMB
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rts ; return
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mb_not_in_this_slot:
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dec mb_detect_loop+1 ; decrement the "slot" (self_modify)
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bne mb_detect_loop ; loop down to one
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ldx #00
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beq done_mb_detect
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;alternative MB detection from Nox Archaist
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; lda #$04
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; sta MB_ADDRL
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; ldx #$c7
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;
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;find_mb:
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; stx MB_ADDRH
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;
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; ;detect sound I
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;
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; sec
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; ldy #$00
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; lda (MB_ADDRL), y
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; sbc (MB_ADDRL), y
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; cmp #$05
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; beq found_mb
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; dex
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; cpx #$c0
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; bne find_mb
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; ldx #$00 ;no mockingboard found
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; rts
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;
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;found_mb:
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; ldx #$01 ;mockingboard found
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; rts
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;
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; ;optionally detect sound II
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;
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; sec
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; ldy #$80
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; lda (MB_ADDRL), y
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; sbc (MB_ADDRL), y
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; cmp #$05
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; beq found_mb
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;=======================================
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; Detect a Mockingboard card in Slot4
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;=======================================
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; Based on code from the French Touch "Pure Noise" Demo
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; Attempts to time an instruction sequence with a 6522
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;
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; MB_ADDRL:MB_ADDRH has address of Mockingboard
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; returns X=0 if not found, X=1 if found
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mockingboard_detect_slot4:
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lda #0
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sta MB_ADDRL
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mb4_detect_loop: ; self-modifying
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lda #$04 ; we're only looking in Slot 4
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ora #$C0 ; make it start with C
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sta MB_ADDRH
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ldy #04 ; $CX04
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ldx #02 ; 2 tries?
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mb4_check_cycle_loop:
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lda (MB_ADDRL),Y ; timer 6522 (Low Order Counter)
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; count down
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sta PT3_TEMP ; 3 cycles
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lda (MB_ADDRL),Y ; + 5 cycles = 8 cycles
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; between the two accesses to the timer
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sec
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sbc PT3_TEMP ; subtract to see if we had 8 cycles
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cmp #$f8 ; -8
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bne mb4_not_in_this_slot
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dex ; decrement, try one more time
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bne mb4_check_cycle_loop ; loop detection
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inx ; Mockingboard found (X=1)
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done_mb4_detect:
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rts ; return
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mb4_not_in_this_slot:
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ldx #00
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beq done_mb4_detect
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;=============================
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; Setup
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;=============================
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pt3_setup_interrupt:
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mockingboard_setup_interrupt:
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;===========================
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; Check for Apple IIc
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@ -300,6 +182,11 @@ done_apple_detect:
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; Enable 50Hz clock on 6522
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;============================
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; 4fe7 / 1e6 = .020s, 50Hz
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; 9c40 / 1e6 = .040s, 25Hz
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; 411a / 1e6 = .016s, 60Hz
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sei ; disable interrupts just in case
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lda #$40 ; Continuous interrupts, don't touch PB7
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@ -318,9 +205,4 @@ done_apple_detect:
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; load both values into counter
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; clear interrupt and start counting
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; 4fe7 / 1e6 = .020s, 50Hz
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rts
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@ -42,9 +42,8 @@ pt3_setup:
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jsr print_mockingboard_detect
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jsr mockingboard_detect_slot4 ; call detection routine
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cpx #$1
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beq mockingboard_found
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jsr mockingboard_detect ; call detection routine
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bcs mockingboard_found
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jsr print_mocking_notfound
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;jmp forever_loop
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@ -53,6 +52,11 @@ pt3_setup:
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mockingboard_found:
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lda MB_ADDR_H
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sec
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sbc #$10
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sta found_message+11
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jsr print_mocking_found
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setup_interrupt:
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@ -61,7 +65,7 @@ setup_interrupt:
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;========================
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jsr mockingboard_init
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jsr pt3_setup_interrupt
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jsr mockingboard_setup_interrupt
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;============================
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; Init the Mockingboard
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@ -149,9 +153,9 @@ done_found_message:
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;=========
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; strings
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;=========
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mocking_message: .asciiz "LOOKING FOR MOCKINGBOARD IN SLOT #4"
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mocking_message: .asciiz "LOOKING FOR MOCKINGBOARD: "
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not_message: .byte "NOT "
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found_message: .asciiz "FOUND"
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found_message: .asciiz "FOUND SLOT#4"
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@ -165,9 +169,11 @@ found_message: .asciiz "FOUND"
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.include "pt3_lib_core.s"
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.include "pt3_lib_init.s"
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.include "pt3_lib_mockingboard.s"
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.include "pt3_lib_mockingboard_setup.s"
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.include "pt3_lib_mockingboard_detect.s"
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.include "interrupt_handler.s"
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;=============
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; include song
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;=============
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@ -25,9 +25,9 @@ SAMPLE_L = $82
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SAMPLE_H = $83
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LOOP = $84
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MB_VALUE = $85
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MB_ADDRL = $86
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MB_ADDRH = $87
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MB_ADDR_L = $85
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MB_ADDR_H = $86
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MB_VALUE = $87
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DONE_PLAYING = $88
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DONE_SONG = $89
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PT3_TEMP = $8A
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