130 lines
4.7 KiB
ArmAsm
130 lines
4.7 KiB
ArmAsm
; Names of ZP and low memory locations
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; (Only those of relevance for the KERNAL)
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; (And only those for now that we feel the need to implement initially)
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; (https://www.c64-wiki.com/wiki/Zeropage)
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.alias TXTTAB $2B
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.alias IOSTATUS $90
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; Keys down clears bits. STOP=bit 7, C= bit 6, SPACE bit 4, CTRL bit 2
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.alias BUCKYSTATUS $91
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.alias kernal_load_or_verify_flag $93
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.alias current_file_num $98
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.alias LDTND $98 ; number of entries in LAT / FAT / SAT tables
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.alias DFLTN $99
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.alias input_device_number DFLTN
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; bit 6 = error messages, bit 7 = control messages
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.alias kernal_message_control_flags $9d
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.alias jiffy_clock_24bits $a0
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.alias cassette_buffer_bytes_used $A6
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.alias load_or_scroll_temp_pointer $AC
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;; We also use the following for temp colour pointer when scrolling
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.alias load_save_verify_end_address $AE
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.alias cassette_buffer_ptr $B2
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.alias current_filename_length $B7
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.alias current_logical_filenum $B8
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.alias current_secondary_address $B9
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.alias current_device_number $BA
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.alias current_filename_ptr $BB
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.alias load_save_start_ptr $C1
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.alias load_save_end_ptr $C3
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.alias last_key_matrix_position $C5
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.alias keys_in_key_buffer $C6
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.alias reverse_video_flag $C7
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.alias end_of_input_line $C8
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.alias start_of_keyboard_input $C9
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.alias current_key_index_entry $CB
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.alias cursor_blink_disable $CC
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.alias cursor_blink_countdown $CD
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.alias cursor_saved_character $CE
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.alias cursor_is_visible $CF
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.alias keyboard_input_ready $D0
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.alias current_screen_line_ptr $D1
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.alias current_screen_x $D3
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.alias quote_mode_flag $D4
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.alias logical_line_length $D5
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.alias current_screen_y $D6
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.alias last_printed_character_ascii $D7
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.alias insert_mode $D8
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; Bits 0 -3 = bits 8-11 of screen line address
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; Bit 7 = line spans multiple physical lines
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.alias screen_line_link_table $D9
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.alias current_screen_line_colour_ptr $F3
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.alias keyboard_decoding_table_ptr $F5
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.alias rs232_rx_buffer_ptr $F7
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.alias rs232_tx_buffer_ptr $F9
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;; 2-byte location below seems to be a good place for temporary storage,
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;; it seems used for timing during tape reads only - see:
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;; - 'C64 Programmer's Reference Guide', page 314
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;; - 'Compute's Mapping the Commodore 64', page 32
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.alias CMP0 $B0 ;; $B0-$B1
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;; Kernal tables for opened files, 10 entries each
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.alias LAT $0259 ; logical file numbers
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.alias FAT $0263 ; device numbers
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.alias SAT $026D ; secondary addresses
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; "Compute's Mapping the 64" book
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.alias keyboard_buffer $0277
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.alias MEMSTR $0281
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.alias MEMSIZ $0283 ; NOTE: Mapping the 64 erroniously has the hex as $282, while the DEC is correct
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.alias text_colour $0286 ; p55
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.alias colour_under_cursor $0287 ; p56
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.alias HIBASE $0288 ; p56 (high byte of start of screen)
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.alias key_buffer_size $0289 ; p57
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;; 0 = cursor keys, insert, delete and space repeat, but nothing else
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;; 128 = all keys repeat
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;; 64 = no keys repeat
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.alias key_repeat_flags $028A ; p58
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;; https://www.c64-wiki.com/wiki/Page_2
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.alias key_repeat_counter $028B
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.alias key_first_repeat_delay $028C
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;; bit 0 = shift, 1 = Vendor Key, 2 = Control
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.alias key_bucky_state $028D
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.alias key_last_bucky_state $028E
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.alias keyboard_decoding_ptr $028F
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.alias enable_case_switch $0291
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.alias screen_scroll_disable $0292
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.alias RSSTAT $0297 ; RS-232 status
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.alias pal_or_ntsc $02A6
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;; Kernal vectors - interrupts
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.alias CINV $0314
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.alias CBINV $0316
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.alias NMINV $0318
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;; Kernal vectors - routines
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.alias IOPEN $031A
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.alias ICLOSE $031C
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.alias ICHKIN $031E
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.alias ICKOUT $0320
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.alias ICLRCH $0322
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.alias IBASIN $0324
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.alias IBASOUT $0326
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.alias ISTOP $0328
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.alias IGETIN $032A
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.alias ICLALL $032C
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.alias USRCMD $032E
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.alias ILOAD $0330
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.alias ISAVE $0331
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;; Under-ROM routines
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;; (BASIC also includes them. XXX - We should de-duplicate them in a safe manner)
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.alias missed_nmi_flag $2A7
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.alias tiny_nmi_handler $2A8
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.alias peek_under_roms tiny_nmi_handler+peek_under_roms_routine-tiny_nmi_handler_routine
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.alias poke_under_roms tiny_nmi_handler+poke_under_roms_routine-tiny_nmi_handler_routine
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.alias memmap_allram tiny_nmi_handler+memmap_allram_routine-tiny_nmi_handler_routine
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.alias memmap_normal tiny_nmi_handler+memmap_normal_routine-tiny_nmi_handler_routine
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;; CIA#2 - https://www.c64-wiki.com/wiki/CIA#CIA_2
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.alias CI2PRA $DD00 ; VIC bank switching and IEC port
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.alias BIT_CI2PRA_ATN_OUT $08 ; 1 - low (pulled), 0 - high (released)
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.alias BIT_CI2PRA_CLK_OUT $10 ; 1 - low (pulled), 0 - high (released)
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.alias BIT_CI2PRA_DAT_OUT $20 ; 1 - low (pulled), 0 - high (released)
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.alias BIT_CI2PRA_CLK_IN $40 ; 0 - low (pulled), 1 - high (released)
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.alias BIT_CI2PRA_DAT_IN $80 ; 0 - low (pulled), 1 - high (released)
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