start working on boot code, move things around

README.md

@@ -21,4 +21,4 @@ Prototype 1 is currently in progress. It will be a much simpler system. It will
 
 ## License
 
-This project is licensed under the MIT license. This applies to both the hardware (schematics, bill of materials, pcb layouts) and documentation. This does *not* apply to the datasheets/ directory, the code/books/ directory or code/assist09.asm. Those files belong to their respective copyright holders.
+This project is licensed under the MIT license. This applies to both the hardware (schematics, bill of materials, pcb layouts) and documentation. This does *not* apply to the datasheets/ directory, the books/ directory or code/assist09/assist09.asm. Those files belong to their respective copyright holders.

code/README.md

@@ -1,5 +1,13 @@
 # Code
 
+## assist09/
+
 assist09.asm is the original motorola version, and relies on the as9 assembler found [here](http://home.hccnet.nl/a.w.m.van.der.horst/m6809.html).
 
 assemble.sh will assemble assist09.asm to an s19 file and use gnu binutils objcopy to turn that into a bin file.
+
+## boot/
+
+the boot code for prototype 1, uses the lwtools assembler.
+
+assemble.sh will assemble boot.s to an s19 file and use gnu binutils objcopy to turn that into a bin file.

code/boot/assemble.sh

@@ -0,0 +1,3 @@
+lwasm --format=srec --output=boot.s19 boot.s
+objcopy --input-target=srec --output-target=binary boot.s19 boot.bin
+#mot2bin -out boot.bin boot.s19

code/boot/boot.ld

@@ -0,0 +1,3 @@
+section code load 8000
+pad FFFF
+section vectors load FFF0

code/boot/boot.s

@@ -0,0 +1,44 @@
+; 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:
+  sta $cc
+  jmp RESET
+  fdb RESET
+
+;  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

code/boot/boot.s19

@@ -0,0 +1,5 @@
+S01800005B6C77746F6F6C7320342E32335D20626F6F742E73BF
+S10A800097CC7E8000800094
+S113FFF0000000000000000000000000000080007D
+S5030002FA
+S9030000FC

code/boot/devenvironment.md

@@ -0,0 +1,10 @@
+# Dev environment
+
+USE:
+
+- [lwtools](http://www.lwtools.ca/)
+- [f9dasm](https://github.com/Arakula/f9dasm)
+
+lwtools uses lwasm
+
+f9dasm uses f9dasm

docs/prototype-1-specs.md

@@ -1,15 +1,15 @@
 # 6309 Board Prototype #1 Specs
 
 HD63C09 CPU @ 3MHz
-HM62256BLP-7 SRAM
-AT28C256-15 EEPROM
-ST16C550 UART @ 1.8342MHz (XO due to lack of 22pf 1.8432MHz XTALs)
+AS6C62256-55 SRAM (32KB)
+SST39SF010A-70 FLASH (32KB Used)
+PC16550 UART @ 1.8342MHz
 
 ## Memory Map
 
 | Device | Location  |
 |--------|-----------|
-| EEPROM | 8000-FFFF |
+| FLASH  | 8000-FFFF |
 | UART   | 7F00-7FFF |
 | SRAM   | 0000-7EFF |
 
@@ -17,6 +17,6 @@ ST16C550 UART @ 1.8342MHz (XO due to lack of 22pf 1.8432MHz XTALs)
 
 | A15 | A14-A9 | A8 | Chip   |
 |-----|--------|----|--------|
-| H   | x      | x  | EEPROM |
+| H   | x      | x  | FLASH  |
 | L   | x      | L  | SRAM   |
 | L   | H      | H  | UART   |