adapted to Kick Assembler, some documentation update
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@@ -1,9 +1,10 @@
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default_irq_handler:
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default_irq_handler:
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jsr blink_cursor
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jsr JSCNKEY
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jsr JUDTIM ; update jiffy clock
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jsr JUDTIM // update jiffy clock
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;; Acknowledge CIA interrupt and return
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// Acknowledge CIA interrupt and return
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jmp clear_cia1_interrupt_flag_and_return_from_interrupt
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@@ -1,11 +1,11 @@
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;; https://csdb.dk/forums/index.php?roomid=11&topicid=5776
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;; Clear the CIA1 interrupt flag, and then fall through to
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;; the return from interrupt routine
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// https://csdb.dk/forums/index.php?roomid=11&topicid=5776
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// Clear the CIA1 interrupt flag, and then fall through to
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// the return from interrupt routine
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clear_cia1_interrupt_flag_and_return_from_interrupt:
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;; We have free choice of LDA, LDX or LDY to achieve this goal
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;; in 3 bytes and minimum cycles. Thus we randomly choose LDY.
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LDY $DC0D
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// We have free choice of LDA, LDX or LDY to achieve this goal
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// in 3 bytes and minimum cycles. Thus we randomly choose LDY.
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ldy CIA1_ICR
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;; FALL THROUGH to $EA81
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// FALL THROUGH to $EA81
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@@ -1,18 +1,20 @@
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;; The IRQ is a commonly messed with thing on the C64,
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;; so we need to handle entry points that are commonly
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;; relied upon, including:
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;; $EA31 - Standard IRQ routine
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;; $EA61 - Check keyboard, but don't update timer? https://github.com/cc65/cc65/issues/324
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;; $EA81 - https://www.lemon64.com/forum/viewtopic.php?t=2112&sid=6ea01982b26da69783120a7923ca46fb
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;; Also the $0314 vector is widely used (e.g., https://www.lemon64.com/forum/viewtopic.php?t=2112&sid=6ea01982b26da69783120a7923ca46fb)
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// The IRQ is a commonly messed with thing on the C64,
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// so we need to handle entry points that are commonly
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// relied upon, including:
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// $EA31 - Standard IRQ routine
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// $EA61 - Check keyboard, but don't update timer? https://github.com/cc65/cc65/issues/324
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// $EA81 - https://www.lemon64.com/forum/viewtopic.php?t=2112&sid=6ea01982b26da69783120a7923ca46fb
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// Also the $0314 vector is widely used (e.g., https://www.lemon64.com/forum/viewtopic.php?t=2112&sid=6ea01982b26da69783120a7923ca46fb)
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return_from_interrupt:
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;; Restore registers and return
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;; Sequence according to Compute's Mapping the 64 p73
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// Restore registers and return
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// Sequence according to Compute's Mapping the 64 p73
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pla
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tay
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pla
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tax
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pla
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rti
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@@ -1,34 +1,33 @@
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default_nmi_handler:
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;; Implemented according to Compute's Mapping the Commodore 64, page 74
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;; and to https://www.c64-wiki.com/wiki/Interrupt
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// Implemented according to Compute's Mapping the Commodore 64, page 74
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// and to https://www.c64-wiki.com/wiki/Interrupt
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;; Save registers, sequence according to Compute's Mapping the Commodore 64, page 73
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// Save registers, sequence according to Compute's Mapping the Commodore 64, page 73
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pha
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txa
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pha
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tya
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pha
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;; XXX: RS-232 support is not implemented
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// XXX: RS-232 support is not implemented
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;; XXX confirm NMIs from CIA, or no other NMI will arrive!
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// XXX confirm NMIs from CIA, or no other NMI will arrive!
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jsr cartridge_check
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bcc +
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bcc !+
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jmp (ICART_WARM_START)
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*
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!:
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;; According to C64 Wiki, if STOP key is pressed, the routine assumes warm start request
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// According to C64 Wiki, if STOP key is pressed, the routine assumes warm start request
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jsr JSTOP
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bcs +
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jmp return_from_interrupt ; no STOP pressed
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*
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;; STOP + RESTORE - clean the address of the BRK instruction (it's not BRK) first
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bcs !+
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jmp return_from_interrupt // no STOP pressed
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!:
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// STOP + RESTORE - clean the address of the BRK instruction (it's not BRK) first
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lda #$00
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sta CMP0+0
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sta CMP0+1
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jmp (CBINV)
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@@ -1,13 +1,13 @@
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default_brk_handler:
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;; Implemented according to Compute's Mapping the Commodore 64, pages 73-74
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// Implemented according to Compute's Mapping the Commodore 64, pages 73-74
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sei ; disable IRQs, to be sure they won't interfere
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sei // disable IRQs, to be sure they won't interfere
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jsr JRESTOR
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jsr JIOINIT
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jsr CINT_BRK
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jsr cint_brk
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cli
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@@ -1,38 +1,38 @@
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irq_handler:
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;; The IRQ is a commonly messed with thing on the C64,
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;; so we need to handle entry points that are commonly
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;; relied upon, including:
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;; $EA31 - Standard IRQ routine
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;; $EA61 - Check keyboard, but don't update timer? https://github.com/cc65/cc65/issues/324
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;; $EA81 - https://www.lemon64.com/forum/viewtopic.php?t=2112&sid=6ea01982b26da69783120a7923ca46fb
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;; Also the $0314 vector is widely used (e.g., https://www.lemon64.com/forum/viewtopic.php?t=2112&sid=6ea01982b26da69783120a7923ca46fb)
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// The IRQ is a commonly messed with thing on the C64,
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// so we need to handle entry points that are commonly
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// relied upon, including:
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// $EA31 - Standard IRQ routine
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// $EA61 - Check keyboard, but don't update timer? https://github.com/cc65/cc65/issues/324
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// $EA81 - https://www.lemon64.com/forum/viewtopic.php?t=2112&sid=6ea01982b26da69783120a7923ca46fb
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// Also the $0314 vector is widely used (e.g., https://www.lemon64.com/forum/viewtopic.php?t=2112&sid=6ea01982b26da69783120a7923ca46fb)
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;; Save registers, sequence according to Compute's Mapping the Commodore 64, page 73
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// Save registers, sequence according to Compute's Mapping the Commodore 64, page 73
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pha
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txa
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pha
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tya
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pha
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;; Check if caused by BRK
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// Check if caused by BRK
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tsx
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lda $0104, x ; get the pre-interrupt processor state
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lda $0104, x // get the pre-interrupt processor state
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and #$10
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bne irq_handler_brk
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;; Not caused by BRK - call interrupt routine (only if initialised)
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// Not caused by BRK - call interrupt routine (only if initialised)
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lda CINV
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ora CINV+1
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beq +
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beq !+
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jmp (CINV)
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*
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;; Vector not initialized - call default interrupt routine
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!:
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// Vector not initialized - call default interrupt routine
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jmp default_irq_handler
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irq_handler_brk:
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;; Store BRK adddress, to be displayed
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// Store BRK adddress, to be displayed
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sec
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lda $0105, x
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sbc #$02
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@@ -41,6 +41,6 @@ irq_handler_brk:
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sbc #$00
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sta CMP0+1
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;; Interrupt caused by BRK
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// Interrupt caused by BRK
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jmp (CBINV)
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@@ -1,17 +1,17 @@
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nmi_handler:
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sei ;; don't allow IRQ to interfere, see https://www.c64-wiki.com/wiki/Interrupt
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sei // don't allow IRQ to interfere, see https://www.c64-wiki.com/wiki/Interrupt
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;; Call interrupt routine (only if initialised)
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// Call interrupt routine (only if initialised)
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pha
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lda NMINV
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ora NMINV+1
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beq +
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beq !+
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pla
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jmp (NMINV)
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*
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;; Vector not initialized - call default interrupt routine
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!:
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// Vector not initialized - call default interrupt routine
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pla
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jmp default_nmi_handler
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