62 lines
948 B
ArmAsm
62 lines
948 B
ArmAsm
// BASIC Cold start entry point
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// Compute's Mapping the 64 p211
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basic_cold_start:
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// Setup vectors at $300
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ldy #$0B
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!:
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lda basic_vector_defaults_1, y
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sta IERROR, y
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dey
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bpl !-
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// Setup misc vectors
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ldy #$04
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!:
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lda basic_vector_defaults_2, y
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sta ADRAY1, y
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dey
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bpl !-
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// Setup USRPOK
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lda #$4C // JMP opcode
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sta USRPOK
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lda #<do_ILLEGAL_QUANTITY_error
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sta USRADD+0
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lda #>do_ILLEGAL_QUANTITY_error
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sta USRADD+1
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// Print startup banner
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jsr printf // XXX don't use printf, keep it for debug purposes only
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TARGET_HOOK_BANNER()
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// Print PAL/NTSC
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ldx #30 // NTSC
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lda TVSFLG
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beq !+
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ldx #31 // PAL
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!:
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jsr print_packed_message
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// Work out free bytes, display them
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jsr basic_do_new
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lda MEMSIZ+0
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sec
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sbc TXTTAB+0
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tax
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lda MEMSIZ+1
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sbc TXTTAB+1
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jsr print_integer
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lda #$20
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jsr JCHROUT
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// Print the rest of the start up message
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ldx #34
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jsr print_packed_message
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// jump into warm start loop
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jmp basic_warm_start
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