chore: renamed source file to move it to src dir

code/boot/src/boot.s

@@ -0,0 +1,58 @@
+; CHIBI PC-09 Prototype #1 Boot ROM
+; (Copyright (c) 2024 Amber Zeller
+
+; UART registers
+UART = $7F00
+
+; When DLAB = 0
+BUFR = UART  ; TX/RX Buffer (Read for RX, Write for TX)
+IER = UART+1 ; Interrupt Enable Register
+IIR = UART+1 ; Interrupt Enable Register (Upon Read)
+; When DLAB = 1
+DLL = UART   ; Divisor Latch (LSB)
+DLM = UART+1 ; Divisor Latch (MSB)
+
+FCR = UART+2 ; FIFO Control Register (Upon Write)
+LCR = UART+3 ; Line Control Register
+MCR = UART+4 ; MODEM Control Register
+LSR = UART+5 ; Line Status Register
+MSR = UART+6 ; MODEM Status Register
+SCR = UART+7 ; Scratch Register (Not for control just spare RAM)
+
+;  SECTION code
+
+  ORG $8000
+
+RESET:
+  ; UART Setup
+  lda %11000001 ; 8n1 serial, enable DLAB
+  sta LCR
+
+  lda $00       ; Set divisor to 12 (9600 baud)
+  sta DLL
+  lda $0C
+  sta DLM
+
+  lda %11000000 ; 8n1 serial, disable DLAB
+  sta LCR
+
+  lda %01000000 ; Enable RTS
+  sta MCR
+
+  lda 'H        ; send H
+  STA BUFR
+
+;  ENDSECTION
+
+;  SECTION vectors
+  ORG $FFF0
+  ; Reset/Interrupt Vectors
+  fdb  $0000 ; Reserved
+  fdb  $0000 ; SWI3
+  fdb  $0000 ; SWI2
+  fdb  $0000 ; FIRQ
+  fdb  $0000 ; IRQ
+  fdb  $0000 ; SWI
+  fdb  $0000 ; NMI
+  fdb  RESET ; Reset
+;  ENDSECTION