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PKMNRBY-code-converter

Original framework this is derived from: 8F Helper (KernelEquinox) Logic for Nickwriter function Nickname Writer Code Generator (Scott Maxwell & TimoVM)

All-in-one conversion tool application written in C which is able to convert ASM & HEX machine code for the Sharp SM83 (gbz80) found in the Nintendo Gameboy, as well as translate these codes into various setups used for arbitrary code execution (ACE) in Gen 1 - Pokemon R/B/Y.

Supports the following formats:

  • asm - GB-Z80 assembly language
  • hex - Hexadecimal machine code format
  • joy - Joypad values
  • item - R/B/Y item codes for use with ACE
  • nickname - for use with TimoVM's Nickwriter

Smart Item Conversion

Many modern ACE setups start off with an expanded inventory where j. x00 items are plentiful. By utilizing these free items, it will reduce the number of unique items that need to be obtained. This is accomplished by adding nop instructions to the input code, in places where it will have no detrimental effect, in order to offset the current address to a "quantity" slot. This is avoided where a conversion will be a "friendly" item like Ultra Balls/Master Balls which are easy to obtain

Usage

Usage: pkmnrby-cc [options] [hex]

Options:
  -o format    Display output in specificied format (default: hex)
  -org offset  Specify memory offset for start of code
  -h           Print this help message and exit
  -v           Print version information and exit

Formats:
  asm          GB-Z80 assembly language
  hex          Hexadecimal machine code format
  joy          Joypad values
  item        R/B/Y item codes for use with ACE
  nickname         for used with TimoVM's Nickwriter

Modes:
This is specific to the item output format.
Mode 0 will do normal code -> item conversion
Mode 1 will replace as many instances of the code as possible
with `j. xQQ` since in expanded inventory you will have plenty
of those available. It does so by adding `nop` instructions to your code.
This will reduce the number of unique items needed, and save time
hunting them down.

Examples:
  pkmnrby-cc EA14D7C9
  pkmnrby-cc -o asm bgb_mem.dump
  pkmnrby-cc zzazz.asm
  pkmnrby-cc -o item 0E1626642EBB4140CDD635C9
  pkmnrby-cc -o nickname coin_case.asm

Examples

test_code.asm:

.org $D322

di               ; Kill all interrupts

.testJump        ; Just to show the label/jump processing
dec a
inc a
inc b
jr c, testJump   ; Relative jump to label

ld h, $FF        ; Set hl to $FF00
inc b
xor l

ld a, $20        ; Enter STOP mode until D-pad is pressed
inc c
ld (hl), a
stop

ret              ; Continue normal execution

Program outputs:

root@gbdev:~# pkmnrby-cc test_code.asm

**************************************************************
 ____  _  __ _      _      ____  ____ ___  _
/  __\/ |/ // \__/|/ \  /|/  __\/  __\\  \//
|  \/||   / | |\/||| |\ |||  \/|| | // \  /
|  __/|   \ | |  ||| | \|||    /| |_\\ / /
\_/   \_|\_\\_/  \|\_/  \|\_/\_\\____//_/
 ____  ____  ____  _____   
/   _\/  _ \/  _ \/  __/
|  /  | / \|| | \||  \ _____
|  \_ | \_/|| |_/||  /_\____\
\____/\____/\____/\____\
____  ____  _      _     _____ ____  _____  _____ ____
/   _\/  _ \/ \  /|/ \ |\/  __//  __\/__ __\/  __//  __\ 
|  /  | / \|| |\ ||| | //|  \  |  \/|  / \  |  \  |  \/|
|  \_ | \_/|| | \||| \// |  /_ |    /  | |  |  /_ |    /
\____/\____/\_/  \|\__/  \____\\_/\_\  \_/  \____\\_/\_\ 

**************************************************************
Input format detected as asm!

*********************************************************
Assembly Code:
.org D322

di               ; Kill all interrupts

.testJump        ; Just to show the label/jump processing
dec a
inc a
inc b
jr c, testJump   ; Relative jump to label

ld h, $FF        ; Set hl to $FF00
inc b
xor l

ld a, $20        ; Enter STOP mode until D-pad is pressed
inc c
ld (hl), a
stop

ret              ; Continue normal execution 

*********************************************************
Full Joypad Writer
==================

Joypad Values:
A
DOWN UP LEFT RIGHT B A A
LEFT RIGHT START SELECT A A
LEFT RIGHT START SELECT SELECT
DOWN SELECT DOWN DOWN
LEFT RIGHT START START
DOWN UP LEFT RIGHT START B A A
LEFT SELECT B B
DOWN UP LEFT RIGHT START SELECT B A A
SELECT SELECT
DOWN LEFT START SELECT A A
LEFT RIGHT START SELECT B B
LEFT LEFT
START SELECT SELECT
UP LEFT RIGHT SELECT B A A
RIGHT RIGHT
A A
DOWN UP START A A
START + SELECT

Total number of button presses: 85


*********************************************************
Nicknames for TimOS' Nickname Writer
====================================

Nickname 1 (36 keypresses, checksum: 0x28):	"jbl!l?saj?"
Nickname 2 (24 keypresses, checksum: 0x51):	"jjywvVmmMV"
Nickname 3 (33 keypresses, checksum: 0x71):	"g.yqz([Mn]ttk"
Nickname 4 (11 keypresses, checksum: 0x4A):	"irRh"

Total Keypresses: 108


*********************************************************
Smart Item List:

Item            Quantity
========================
TM43            x61
[item 0x00]     x60
Poke Ball       x56
TM50            x38
CANCEL (TM55)   x4
[item 0xAD]     x62
Fire Stone      x12
[item 0x00]     x119
Full Restore    x1
[item 0x00]     x201


-- WARNING! --
 * Duplicate item stacks detected!
 * Glitch items detected!

*********************************************************
Standard Item List:

Item            Quantity
========================
TM43            x61
Fresh Water     x4
Super Repel     x251
Carbos          x255
Poke Ball       x173
Lemonade        x32
Burn Heal       x119
Full Restore    x1
TM01            xAny

*********************************************************
Machine code: F33D3C0438FB26FF04AD3E200C771001C9

Notes

I've opted to use 10 01 as the STOP opcode instead of the correct 10 00. This is because it's much easier to get 1 of an item rather than 0 of an item. In all tests, the STOP instruction executes normally even with a non-zero argument.