Jasmin FTDOS boot sector disassembly by Peter Gordon (pete@petergordon.org.uk) *************************************** start 0400 78 SEI ; Disable interrupts 0401 A9 7F LDA #$7F ; Disable VIA interrupts 0403 8D 0E 03 STA $030E 0406 A9 01 LDA #$01 ; Enable overlay RAM 0408 8D FA 03 STA $03FA 040B A9 00 LDA #$00 ; Enable BASIC ROM 040D 8D FB 03 STA $03FB 0410 85 04 STA $04 ; Set LSB of read address to $00 0412 8D F4 03 STA $03F4 ; Issue a restore command 0415 A2 02 LDX #$02 ; End at track #2 (SMC operand for instruction at $0452) 0417 AC 30 02 LDY $0230 ; Test for ROM v1.0 041A C0 40 CPY #$40 041C D0 04 BNE .rom11 ; ROM 1.1? Stick with tracks 0 to 2 041E A9 04 LDA #$04 ; We want track #4 0420 A2 06 LDX #$06 ; End at track #6 .rom11 0422 85 01 STA $01 ; Store start track number 0424 8E 53 04 STX $0453 ; Modify end track number check at $452 0427 A9 AC LDA #>irqvector ; Set up IRQ vector to $04AC 0429 8D FE FF STA $FFFE 042C A9 04 LDA #