mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-07 08:30:20 +00:00
fake_bios: add 6502, aux, and mockingboard detection
This commit is contained in:
Vince Weaver
parent
1ead39db6e
commit
9aa045e297
10
graphics/hgr/fake_bios/65c02_detect.s
Normal file
10
graphics/hgr/fake_bios/65c02_detect.s
Normal file
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@ -0,0 +1,10 @@
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; relies on different behavior of decimal mode on 6502 vs 65c02
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detect_65c02:
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sed ; set decimal mode
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clc ; clear carry for add
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lda #$99 ; 99 decimal
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adc #$01 ; +1 gives 00 and sets Z on 65C02
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cld ; exit decimal mode
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rts
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@ -26,7 +26,9 @@ FAKE_BIOS: fake_bios.o
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fake_bios.o: fake_bios.s \
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hgr_clear_screen.s \
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font_console_1x8.s fonts/a2_cga_thin.inc \
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pt3_lib_detect_model.s lc_detect.s \
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pt3_lib_detect_model.s lc_detect.s aux_detect.s \
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65c02_detect.s pt3_lib_mockingboard_detect.s \
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pt3_lib_mockingboard_setup.s \
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zx02_optim.s graphics/a2_energy.hgr.zx02
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ca65 -o fake_bios.o fake_bios.s -l fake_bios.lst
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51
graphics/hgr/fake_bios/aux_detect.s
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51
graphics/hgr/fake_bios/aux_detect.s
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@ -0,0 +1,51 @@
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detect_aux_ram:
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; if Apple IIgs or IIc assume 128k
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; FIXME: Apple IIgs there are routines to get more accurate count
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lda APPLEII_MODEL
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cmp #'g'
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beq return_64k
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cmp #'c'
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beq return_64k
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cmp #'e'
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bne return_0k ; assume none if not IIe
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; enable AUX zp
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sta $C009
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; write $AA to $FF FF:AUX = AA, FF:MAIN=??
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lda #$AA
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sta $FF
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; disable AUX zp
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sta $C008
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; write $55 to $FF FF:AUX=AA, FF:MAIN=55
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lda #$55
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sta $FF
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; enable AUX zp
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sta $C009
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ldx $FF
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; disable AUX zp ; if aux, then X=AA, else X=55
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sta $C008
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cpx #$AA
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bne return_0k
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return_64k:
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lda #64
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rts
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return_1k:
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lda #1
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rts
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return_0k:
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lda #0
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rts
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@ -21,6 +21,7 @@ bios_test:
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;=======================
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; Hardware Detect Model
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;=======================
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; Yes Michaelangel007 I will eventually update linux_logo 6502
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jsr detect_appleii_model
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@ -42,23 +43,56 @@ is_a_iigs:
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sta CLOCKCTL ; black border
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sta CLOCKCTL ; set twice for VidHD
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lda 's'
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lda #'s'
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sta model_patch_1+9
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lda #'C'
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sta cpu_patch_1+14
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sta cpu_patch_2+2
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lda #'8'
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sta cpu_patch_1+15
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sta cpu_patch_2+3
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lda #'1'
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sta cpu_patch_1+16
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sta cpu_patch_2+4
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lda #'6'
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sta cpu_patch_1+17
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sta cpu_patch_2+5
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not_iigs:
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; update text printed
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lda APPLEII_MODEL
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cmp #'3'
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bne no_not_a_iii
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lda #'/' ; 3 slashes
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sta model_patch_1+6
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sta model_patch_1+7
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sta model_patch_1+8
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bne hardware_detect_ram ; bra
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no_not_a_iii:
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lda APPLEII_MODEL
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sta model_patch_1+8 ; patch to ' ' '+' 'e' 'c' or 'g'
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;=======================
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; Hardware Detect RAM
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;=======================
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hardware_detect_ram:
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;=================================================
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; assume 48k for base model (not necessarily true)
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lda #48 ; FIXME: detect less on earlier models?
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sta TOTAL_RAM
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;================================================
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; detect language card 16k
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; could cheat and just make it 64k in this case
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; can you have a language card on a 4k system?
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jsr detect_language_card
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bcs ram_no_lc
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ram_yes_lc:
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@ -73,10 +107,110 @@ ram_yes_lc:
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lda #'6'
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sta lang_card_patch+35
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ram_no_lc:
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;================================================
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; detect aux memory
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; iigs we're lazy and say 64k
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; iic always 64k AUX
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; iie we have to probe
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; in theory can have 0k, 1k or 64k of it
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jsr detect_aux_ram
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cmp #0
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beq ram_no_aux
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cmp #1
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beq ram_1k_aux
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ram_64k_aux:
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clc
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lda TOTAL_RAM
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adc #64
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sta TOTAL_RAM
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lda #'6'
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sta aux_mem_patch+34
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lda #'4'
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sta aux_mem_patch+35
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bne ram_done_aux ; bra
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ram_1k_aux:
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inc TOTAL_RAM
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lda #'1'
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sta aux_mem_patch+35
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ram_no_aux:
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ram_done_aux:
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;====================
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; detect CPU
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;====================
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lda APPLEII_MODEL
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cmp #'g' ; already handled IIgs
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beq done_detect_cpu
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jsr detect_65c02
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bne was_not_65c02
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lda #'C'
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sta cpu_patch_1+14
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sta cpu_patch_2+2
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lda #'0'
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sta cpu_patch_1+15
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sta cpu_patch_2+3
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lda #'2'
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sta cpu_patch_1+16
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sta cpu_patch_2+4
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was_not_65c02:
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done_detect_cpu:
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;====================
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; detect disk slot
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;====================
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; this depends on DOS3.3 loading
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lda $B5F7 ; slot*16
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lsr
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lsr
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lsr
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lsr
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adc #'0'
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sta slot_patch1+1
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sta slot_patch2+1
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sta slot_patch3+1
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sta slot_patch5+7
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sta slot_patch6+7
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;=====================
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; Detect mockingboard
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;=====================
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lda #0
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sta SOUND_STATUS
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PT3_ENABLE_APPLE_IIC = 1
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jsr mockingboard_detect
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bcc mockingboard_notfound
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mockingboard_found:
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lda MB_ADDR_H
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and #$7
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ora #$30
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sta mock_slot_patch+7
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lda SOUND_STATUS
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ora #SOUND_MOCKINGBOARD
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sta SOUND_STATUS
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mockingboard_notfound:
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;===================
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; Load graphics
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@ -172,6 +306,7 @@ done_memcount:
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jsr BELL
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; print first part of message
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lda #10
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sta CH
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@ -180,9 +315,26 @@ done_memcount:
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lda #<bios_message_2
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ldy #>bios_message_2
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ldx #11
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ldx #8
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jsr draw_multiple_strings
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; optionally print mockingboard text
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lda SOUND_STATUS
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beq print_rest
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jsr DrawCondensedStringAgain
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print_rest:
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; print rest
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lda #<super_serial_text
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ldy #>super_serial_text
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ldx #2
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jsr draw_multiple_strings
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ldx #10
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jsr long_wait
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@ -244,9 +396,10 @@ end:
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bios_message_1:
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.byte "Apple II Modular BIOS",13,0
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.byte "Copyright (C) 1977-1991",13,13,0
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model_patch_1: ;+8
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model_patch_1: ; +8
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.byte "Apple II ",13,13,0
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.byte "65C02 CPU at 1.023MHz",13,0
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cpu_patch_2: ; +2
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.byte "6502 CPU at 1.023MHz",13,0
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.byte "Memory Test: 0B OK",13,0
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bios_message_1a:
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.byte "Press ",$17,"-D to enter SETUP",13,0
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@ -263,9 +416,10 @@ bios_message_2:
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.byte $1E,$1E,$1E,$1E,$1E,$1E,$1E,$1E
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.byte $1E,$1E,$1E,$1E,$1E,$1E
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.byte $1C, 13,0
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.byte $1F," CPU Type: 6502 ",$14," Base Memory: 48K ",$1F,13,0 ; 16
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cpu_patch_1: ; +14
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.byte $1F," CPU Type: 6502 ",$14," Base Memory: 48K ",$1F,13,0 ; 16
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lang_card_patch: ; +34
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.byte $1F," Co-Proc: NONE ",$14," Lang Card: 0K ",$1F,13,0 ; 24
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.byte $1F," Co-Proc: NONE ",$14," Lang Card: 0K ",$1F,13,0 ; 24
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aux_mem_patch: ; +34
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.byte $1F," Clock: 1.023MHz ",$14," AUX Memory: 0K ",$1F,13,0 ; 32
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@ -277,9 +431,16 @@ aux_mem_patch: ; +34
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.byte $1E,$1E,$1E,$1E,$1E,$1E
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.byte $18, 13, 0
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disk_text:
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slot_patch5: ;+7
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.byte $1F," Slot 6 Disk 1: Disk II 140K ",$1F,13,0 ; 48
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slot_patch6:
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.byte $1F," Slot 6 Disk 2: Disk II 140K ",$1F,13,0 ; 56
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mockingboard_text:
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mock_slot_patch: ; +7
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.byte $1F," Slot 4 : VIA 6522/Mockingboard ",$1F,13,0 ; 64
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super_serial_text:
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.byte $1F," Slot 1 : Super Serial Card ",$1F,13,0 ; 72
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@ -296,6 +457,7 @@ bios_message3:
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bios_message4:
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slot_patch1:
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.byte "S6D1>",0 ; 104
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.byte "c",0
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.byte "d",0
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@ -317,6 +479,7 @@ bios_message4:
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bios_message5:
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.byte 13,0
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slot_patch2:
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.byte "S6D1>",0 ; 112
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.byte "d",0
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.byte "i",0
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@ -335,6 +498,7 @@ bios_message_6:
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.byte " 2 Dir(s) 52,736 Bytes free.",13,13,0
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bios_message7:
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slot_patch3:
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.byte "S6D1>",0 ; 184
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.byte "l",0
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.byte "e",0
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@ -590,3 +754,7 @@ early_out:
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.include "pt3_lib_detect_model.s"
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.include "lc_detect.s"
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.include "aux_detect.s"
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.include "65c02_detect.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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@ -4,30 +4,54 @@
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; this is mostly for IIc support
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; as it does interrupts differently
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; ' ' ($20) = Apple II
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; '+' ($2B) = Apple II+
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; 'e' ($45) = Apple IIe
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; 'c' ($43) = Apple IIc
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; 'g' ($47) = Apple IIgs
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; some of this info from the document:
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; Apple II Family Identification Routines 2.2
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;
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; ' ' = Apple II
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; '+' = Apple II+
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; 'e' = Apple IIe
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; 'c' = Apple IIc
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; 'g' = Apple IIgs
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; 'm' = mac L/C with board
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; 'j' = jplus
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; '3' = Apple III
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detect_appleii_model:
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lda #' '
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ldx $FBB3
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; II is $38
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; J-plus is $C9
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; II+ is $EA (so is III)
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; IIe and newer is $06
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cpx #$38
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cpx #$38 ; ii
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beq done_apple_detect
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lda #'+'
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; ii+ is EA FB1E=AD
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; iii is EA FB1E=8A 00
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cpx #$EA
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bne not_ii_iii
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ii_or_iii:
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lda #'+' ; ii+/iii
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ldx $FB1E
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cpx #$AD
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beq done_apple_detect ; ii+
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lda #'3'
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bne done_apple_detect ; bra iii
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not_ii_iii:
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lda #'j' ; jplus
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cpx #$C9
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beq done_apple_detect
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; TODO: check for J-plus or III?
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cpx #$06
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bne done_apple_detect
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222
graphics/hgr/fake_bios/pt3_lib_mockingboard_detect.s
Normal file
222
graphics/hgr/fake_bios/pt3_lib_mockingboard_detect.s
Normal file
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@ -0,0 +1,222 @@
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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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; A/Y clobbered
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;------------------------------------------------------------------------------
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mockingboard_detect:
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; activate Mockingboard IIc
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; + the Mockingboard has to take over Slot#4 (IIc has no slots)
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; in theory any write to the firmware area in $C400 will
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; activate it, but that might not be fast enough when detecting
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; so writing $FF to $C403/$C404 is official way to enable
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; + Note this disables permanently the mouse firmware in $C400
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; so "normal" interrupts are broken :( The hack to fix things
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; is to switch in RAM for $F000 and just replace the IRQ
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; vectors at $FFFE/$FFFF instead of $3FE/$3FF but that makes
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; it difficult if you actually wanted to use any
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; Applesoft/Monitor ROM routines
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;.ifdef PT3_ENABLE_APPLE_IIC
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lda APPLEII_MODEL
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cmp #'C'
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bne not_iic
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lda #$ff
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; don't bother patching these, IIc mockingboard always slot 4
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sta MOCK_6522_DDRA1 ; $C403
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sta MOCK_6522_T1CL ; $C404
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;.endif
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not_iic:
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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:
|
||||
lda (MB_ADDR_L),Y ; read 6522 timer low byte
|
||||
sta MB_VALUE
|
||||
lda (MB_ADDR_L),Y ; second time
|
||||
sec
|
||||
sbc MB_VALUE
|
||||
cmp #$F8 ; looking for (-)8 cycles between reads
|
||||
beq mb_timer_check_done
|
||||
cmp #$F7 ; FastChip //e clock is different
|
||||
mb_timer_check_done:
|
||||
rts
|
||||
|
||||
|
||||
|
||||
.if 0
|
||||
|
||||
|
||||
;=======================================
|
||||
; Detect a Mockingboard card
|
||||
;=======================================
|
||||
; Based on code from the French Touch "Pure Noise" Demo
|
||||
; Attempts to time an instruction sequence with a 6522
|
||||
;
|
||||
; If found, puts in bMB
|
||||
; MB_ADDRL:MB_ADDRH has address of Mockingboard
|
||||
; returns X=0 if not found, X=1 if found
|
||||
|
||||
mockingboard_detect:
|
||||
lda #0
|
||||
sta MB_ADDRL
|
||||
|
||||
mb_detect_loop: ; self-modifying
|
||||
lda #$07 ; we start in slot 7 ($C7) and go down to 0 ($C0)
|
||||
ora #$C0 ; make it start with C
|
||||
sta MB_ADDRH
|
||||
ldy #04 ; $CX04
|
||||
ldx #02 ; 2 tries?
|
||||
mb_check_cycle_loop:
|
||||
lda (MB_ADDRL),Y ; timer 6522 (Low Order Counter)
|
||||
; count down
|
||||
sta PT3_TEMP ; 3 cycles
|
||||
lda (MB_ADDRL),Y ; + 5 cycles = 8 cycles
|
||||
; between the two accesses to the timer
|
||||
sec
|
||||
sbc PT3_TEMP ; subtract to see if we had 8 cycles
|
||||
cmp #$f8 ; -8
|
||||
bne mb_not_in_this_slot
|
||||
dex ; decrement, try one more time
|
||||
bne mb_check_cycle_loop ; loop detection
|
||||
inx ; Mockingboard found (X=1)
|
||||
done_mb_detect:
|
||||
;stx bMB ; store result to bMB
|
||||
rts ; return
|
||||
|
||||
mb_not_in_this_slot:
|
||||
dec mb_detect_loop+1 ; decrement the "slot" (self_modify)
|
||||
bne mb_detect_loop ; loop down to one
|
||||
ldx #00
|
||||
beq done_mb_detect
|
||||
|
||||
;alternative MB detection from Nox Archaist
|
||||
; lda #$04
|
||||
; sta MB_ADDRL
|
||||
; ldx #$c7
|
||||
;
|
||||
;find_mb:
|
||||
; stx MB_ADDRH
|
||||
;
|
||||
; ;detect sound I
|
||||
;
|
||||
; sec
|
||||
; ldy #$00
|
||||
; lda (MB_ADDRL), y
|
||||
; sbc (MB_ADDRL), y
|
||||
; cmp #$05
|
||||
; beq found_mb
|
||||
; dex
|
||||
; cpx #$c0
|
||||
; bne find_mb
|
||||
; ldx #$00 ;no mockingboard found
|
||||
; rts
|
||||
;
|
||||
;found_mb:
|
||||
; ldx #$01 ;mockingboard found
|
||||
; rts
|
||||
;
|
||||
; ;optionally detect sound II
|
||||
;
|
||||
; sec
|
||||
; ldy #$80
|
||||
; lda (MB_ADDRL), y
|
||||
; sbc (MB_ADDRL), y
|
||||
; cmp #$05
|
||||
; beq found_mb
|
||||
|
||||
|
||||
;=======================================
|
||||
; Detect a Mockingboard card in Slot4
|
||||
;=======================================
|
||||
; Based on code from the French Touch "Pure Noise" Demo
|
||||
; Attempts to time an instruction sequence with a 6522
|
||||
;
|
||||
; MB_ADDRL:MB_ADDRH has address of Mockingboard
|
||||
; returns X=0 if not found, X=1 if found
|
||||
|
||||
mockingboard_detect_slot4:
|
||||
lda #0
|
||||
sta MB_ADDRL
|
||||
|
||||
mb4_detect_loop: ; self-modifying
|
||||
lda #$04 ; we're only looking in Slot 4
|
||||
ora #$C0 ; make it start with C
|
||||
sta MB_ADDRH
|
||||
ldy #04 ; $CX04
|
||||
ldx #02 ; 2 tries?
|
||||
mb4_check_cycle_loop:
|
||||
lda (MB_ADDRL),Y ; timer 6522 (Low Order Counter)
|
||||
; count down
|
||||
sta PT3_TEMP ; 3 cycles
|
||||
lda (MB_ADDRL),Y ; + 5 cycles = 8 cycles
|
||||
; between the two accesses to the timer
|
||||
sec
|
||||
sbc PT3_TEMP ; subtract to see if we had 8 cycles
|
||||
cmp #$f8 ; -8
|
||||
bne mb4_not_in_this_slot
|
||||
dex ; decrement, try one more time
|
||||
bne mb4_check_cycle_loop ; loop detection
|
||||
inx ; Mockingboard found (X=1)
|
||||
done_mb4_detect:
|
||||
rts ; return
|
||||
|
||||
mb4_not_in_this_slot:
|
||||
ldx #00
|
||||
beq done_mb4_detect
|
||||
|
||||
|
||||
|
||||
.endif
|
||||
262
graphics/hgr/fake_bios/pt3_lib_mockingboard_setup.s
Normal file
262
graphics/hgr/fake_bios/pt3_lib_mockingboard_setup.s
Normal file
|
|
@ -0,0 +1,262 @@
|
|||
; Mockingboad programming:
|
||||
; + Has two 6522 I/O chips connected to two AY-3-8910 chips
|
||||
; + Optionally has some speech chips controlled via the outport on the AY
|
||||
; + Often in slot 4
|
||||
; TODO: how to auto-detect?
|
||||
; References used:
|
||||
; http://macgui.com/usenet/?group=2&id=8366
|
||||
; 6522 Data Sheet
|
||||
; AY-3-8910 Data Sheet
|
||||
|
||||
;========================
|
||||
; Mockingboard card
|
||||
; Essentially two 6522s hooked to the Apple II bus
|
||||
; Connected to AY-3-8910 chips
|
||||
; PA0-PA7 on 6522 connected to DA0-DA7 on AY
|
||||
; PB0 on 6522 connected to BC1
|
||||
; PB1 on 6522 connected to BDIR
|
||||
; PB2 on 6522 connected to RESET
|
||||
|
||||
|
||||
; left speaker
|
||||
MOCK_6522_ORB1 = $C400 ; 6522 #1 port b data
|
||||
MOCK_6522_ORA1 = $C401 ; 6522 #1 port a data
|
||||
MOCK_6522_DDRB1 = $C402 ; 6522 #1 data direction port B
|
||||
MOCK_6522_DDRA1 = $C403 ; 6522 #1 data direction port A
|
||||
MOCK_6522_T1CL = $C404 ; 6522 #1 t1 low order latches
|
||||
MOCK_6522_T1CH = $C405 ; 6522 #1 t1 high order counter
|
||||
MOCK_6522_T1LL = $C406 ; 6522 #1 t1 low order latches
|
||||
MOCK_6522_T1LH = $C407 ; 6522 #1 t1 high order latches
|
||||
MOCK_6522_T2CL = $C408 ; 6522 #1 t2 low order latches
|
||||
MOCK_6522_T2CH = $C409 ; 6522 #1 t2 high order counters
|
||||
MOCK_6522_SR = $C40A ; 6522 #1 shift register
|
||||
MOCK_6522_ACR = $C40B ; 6522 #1 auxilliary control register
|
||||
MOCK_6522_PCR = $C40C ; 6522 #1 peripheral control register
|
||||
MOCK_6522_IFR = $C40D ; 6522 #1 interrupt flag register
|
||||
MOCK_6522_IER = $C40E ; 6522 #1 interrupt enable register
|
||||
MOCK_6522_ORANH = $C40F ; 6522 #1 port a data no handshake
|
||||
|
||||
|
||||
; right speaker
|
||||
MOCK_6522_ORB2 = $C480 ; 6522 #2 port b data
|
||||
MOCK_6522_ORA2 = $C481 ; 6522 #2 port a data
|
||||
MOCK_6522_DDRB2 = $C482 ; 6522 #2 data direction port B
|
||||
MOCK_6522_DDRA2 = $C483 ; 6522 #2 data direction port A
|
||||
|
||||
; AY-3-8910 commands on port B
|
||||
; RESET BDIR BC1
|
||||
MOCK_AY_RESET = $0 ; 0 0 0
|
||||
MOCK_AY_INACTIVE = $4 ; 1 0 0
|
||||
MOCK_AY_READ = $5 ; 1 0 1
|
||||
MOCK_AY_WRITE = $6 ; 1 1 0
|
||||
MOCK_AY_LATCH_ADDR = $7 ; 1 1 1
|
||||
|
||||
.if 0
|
||||
;========================
|
||||
; Mockingboard Init
|
||||
;========================
|
||||
; Initialize the 6522s
|
||||
; set the data direction for all pins of PortA/PortB to be output
|
||||
|
||||
mockingboard_init:
|
||||
lda #$ff ; all output (1)
|
||||
|
||||
mock_init_smc1:
|
||||
sta MOCK_6522_DDRB1
|
||||
sta MOCK_6522_DDRA1
|
||||
mock_init_smc2:
|
||||
sta MOCK_6522_DDRB2
|
||||
sta MOCK_6522_DDRA2
|
||||
rts
|
||||
|
||||
;===================================
|
||||
;===================================
|
||||
; Reset Both AY-3-8910s
|
||||
;===================================
|
||||
;===================================
|
||||
|
||||
;======================
|
||||
; Reset Left AY-3-8910
|
||||
;======================
|
||||
reset_ay_both:
|
||||
lda #MOCK_AY_RESET
|
||||
reset_ay_smc1:
|
||||
sta MOCK_6522_ORB1
|
||||
lda #MOCK_AY_INACTIVE
|
||||
reset_ay_smc2:
|
||||
sta MOCK_6522_ORB1
|
||||
|
||||
;======================
|
||||
; Reset Right AY-3-8910
|
||||
;======================
|
||||
;reset_ay_right:
|
||||
;could be merged with both
|
||||
lda #MOCK_AY_RESET
|
||||
reset_ay_smc3:
|
||||
sta MOCK_6522_ORB2
|
||||
lda #MOCK_AY_INACTIVE
|
||||
reset_ay_smc4:
|
||||
sta MOCK_6522_ORB2
|
||||
rts
|
||||
|
||||
|
||||
; Write sequence
|
||||
; Inactive -> Latch Address -> Inactive -> Write Data -> Inactive
|
||||
|
||||
;=========================================
|
||||
; Write Right/Left to save value AY-3-8910
|
||||
;=========================================
|
||||
; register in X
|
||||
; value in MB_VALUE
|
||||
|
||||
write_ay_both:
|
||||
; address
|
||||
|
||||
write_ay_smc1:
|
||||
stx MOCK_6522_ORA1 ; put address on PA1 ; 4
|
||||
stx MOCK_6522_ORA2 ; put address on PA2 ; 4
|
||||
lda #MOCK_AY_LATCH_ADDR ; latch_address on PB1 ; 2
|
||||
write_ay_smc2:
|
||||
sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
|
||||
sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
|
||||
ldy #MOCK_AY_INACTIVE ; go inactive ; 2
|
||||
write_ay_smc3:
|
||||
sty MOCK_6522_ORB1 ; 4
|
||||
sty MOCK_6522_ORB2 ; 4
|
||||
;===========
|
||||
; 28
|
||||
; value
|
||||
lda MB_VALUE ; 3
|
||||
write_ay_smc4:
|
||||
sta MOCK_6522_ORA1 ; put value on PA1 ; 4
|
||||
sta MOCK_6522_ORA2 ; put value on PA2 ; 4
|
||||
lda #MOCK_AY_WRITE ; ; 2
|
||||
write_ay_smc5:
|
||||
sta MOCK_6522_ORB1 ; write on PB1 ; 4
|
||||
sta MOCK_6522_ORB2 ; write on PB2 ; 4
|
||||
write_ay_smc6:
|
||||
sty MOCK_6522_ORB1 ; 4
|
||||
sty MOCK_6522_ORB2 ; 4
|
||||
;===========
|
||||
; 29
|
||||
|
||||
rts ; 6
|
||||
;===========
|
||||
; 63
|
||||
write_ay_both_end:
|
||||
;.assert >write_ay_both = >write_ay_both_end, error, "write_ay_both crosses page"
|
||||
|
||||
;=======================================
|
||||
; clear ay -- clear all 14 AY registers
|
||||
; should silence the card
|
||||
;=======================================
|
||||
; 7+(74*14)+5=1048
|
||||
clear_ay_both:
|
||||
ldx #13 ; 2
|
||||
lda #0 ; 2
|
||||
sta MB_VALUE ; 3
|
||||
clear_ay_left_loop:
|
||||
jsr write_ay_both ; 6+63
|
||||
dex ; 2
|
||||
bpl clear_ay_left_loop ; 3
|
||||
; -1
|
||||
rts ; 6
|
||||
|
||||
clear_ay_end:
|
||||
;.assert >clear_ay_both = >clear_ay_end, error, "clear_ay_both crosses page"
|
||||
|
||||
;=============================
|
||||
; Setup
|
||||
;=============================
|
||||
mockingboard_setup_interrupt:
|
||||
|
||||
|
||||
; for this game with things in language card including
|
||||
; irq handler, always force IIc mode (where RAM swapped in
|
||||
; and we put the irq handler address directly up at $FFFE)
|
||||
|
||||
lda #<interrupt_handler
|
||||
sta $fffe
|
||||
lda #>interrupt_handler
|
||||
sta $ffff
|
||||
|
||||
; nop out the "lda $45" since we are bypassing the ROM irq handler
|
||||
; that puts A in $45
|
||||
lda #$EA
|
||||
sta interrupt_smc
|
||||
sta interrupt_smc+1
|
||||
|
||||
|
||||
;=========================
|
||||
; Setup Interrupt Handler
|
||||
;=========================
|
||||
; Vector address goes to 0x3fe/0x3ff
|
||||
; FIXME: should chain any existing handler
|
||||
|
||||
; lda #<interrupt_handler
|
||||
; sta $03fe
|
||||
; lda #>interrupt_handler
|
||||
; sta $03ff
|
||||
|
||||
;============================
|
||||
; Enable 50Hz clock on 6522
|
||||
;============================
|
||||
|
||||
|
||||
; Note, on Apple II the clock isn't 1MHz but is actually closer to
|
||||
; roughly 1.023MHz, and every 65th clock is stretched (it's complicated)
|
||||
|
||||
; 4fe7 / 1.023e6 = .020s, 50Hz
|
||||
; 9c40 / 1.023e6 = .040s, 25Hz
|
||||
; 411a / 1.023e6 = .016s, 60Hz
|
||||
|
||||
; French Touch uses
|
||||
; 4e20 / 1.000e6 = .020s, 50Hz, which assumes 1MHz clock freq
|
||||
|
||||
sei ; disable interrupts just in case
|
||||
|
||||
lda #$40 ; Continuous interrupts, don't touch PB7
|
||||
setup_irq_smc1:
|
||||
sta MOCK_6522_ACR ; ACR register
|
||||
lda #$7F ; clear all interrupt flags
|
||||
setup_irq_smc2:
|
||||
sta MOCK_6522_IER ; IER register (interrupt enable)
|
||||
|
||||
lda #$C0
|
||||
setup_irq_smc3:
|
||||
sta MOCK_6522_IFR ; IFR: 1100, enable interrupt on timer one oflow
|
||||
setup_irq_smc4:
|
||||
sta MOCK_6522_IER ; IER: 1100, enable timer one interrupt
|
||||
|
||||
lda #$E7
|
||||
; lda #$20
|
||||
setup_irq_smc5:
|
||||
sta MOCK_6522_T1CL ; write into low-order latch
|
||||
lda #$4f
|
||||
; lda #$4E
|
||||
setup_irq_smc6:
|
||||
sta MOCK_6522_T1CH ; write into high-order latch,
|
||||
; load both values into counter
|
||||
; clear interrupt and start counting
|
||||
|
||||
rts
|
||||
|
||||
|
||||
|
||||
;=============================
|
||||
; Disable Interrupt
|
||||
;=============================
|
||||
mockingboard_disable_interrupt:
|
||||
|
||||
sei ; disable interrupts just in case
|
||||
|
||||
lda #$40 ; Continuous interrupts, don't touch PB7
|
||||
disable_irq_smc1:
|
||||
sta MOCK_6522_ACR ; ACR register
|
||||
lda #$7F ; clear all interrupt flags
|
||||
disable_irq_smc2:
|
||||
sta MOCK_6522_IER ; IER register (interrupt enable)
|
||||
|
||||
rts
|
||||
|
||||
.endif
|
||||
|
|
@ -27,6 +27,14 @@ CURSOR_X = $62
|
|||
CURSOR_Y = $63
|
||||
|
||||
APPLEII_MODEL = $8B
|
||||
TOTAL_RAM = $8C
|
||||
|
||||
MB_VALUE = $DB
|
||||
MB_ADDR_L = $DC
|
||||
MB_ADDR_H = $DD
|
||||
SOUND_STATUS = $DE
|
||||
SOUND_MOCKINGBOARD = $02
|
||||
|
||||
|
||||
HGR_COLOR = $E4
|
||||
P0 = $F1
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user