93 lines
1.4 KiB
ArmAsm
93 lines
1.4 KiB
ArmAsm
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//
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// IEC part of the SAVE routine
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//
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// XXX this is untested!
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#if CONFIG_IEC
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save_iec_dev_not_found:
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jmp lvs_device_not_found_error
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save_iec_error:
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jmp lvs_device_not_found_error // XXX find a better error
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save_iec: // XXX finish the implementation
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// Display SAVING
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jsr lvs_display_saving
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// Call device to LISTEN
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lda FA
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jsr LISTEN
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bcs save_iec_dev_not_found
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// Open channel 1 (reserved for file writing)
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lda #$01
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jsr iec_cmd_open
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bcs save_iec_dev_not_found
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// Send file name
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jsr iec_send_file_name
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bcs save_iec_error
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// Call device to LISTEN once again
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lda FA
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jsr LISTEN
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bcs save_iec_dev_not_found
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lda #$60 // open channel / data (p3) , required according to p13
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sta TBTCNT
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jsr iec_tx_command
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bcs save_iec_error
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ldy #$00
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iec_save_loop:
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// Retrieve byte to send
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#if CONFIG_MEMORY_MODEL_60K
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ldx #<STAL+0
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jsr peek_under_roms
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#else // CONFIG_MEMORY_MODEL_38K
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lda (STAL),y
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#endif
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// Check if end of saving
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ldx STAL+0
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cpx EAL+0
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bne !+
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ldx STAL+1
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cpx EAL+1
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beq iec_save_loop_end
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!:
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// Send the byte and do next iteration
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sta TBTCNT
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clc
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jsr iec_tx_byte
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jsr lvs_advance_pointer
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jmp iec_save_loop
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iec_save_loop_end:
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// Send last byte
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sta TBTCNT
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sec // mark end of stream
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jsr iec_tx_byte
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// Close file on drive
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lda FA
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jsr iec_close_save
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// Return success
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clc
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rts
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#endif // CONFIG_IEC
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