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V4.5 Fix VRC4e carts (Mapper 23)

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The code change only affects readCHR().  It shortens the check to a single byte but that is enough to identify the four VRC4e carts.  The original list of VRC4e carts that I referenced only showed Boku Dracula-kun and Tiny Toon Adventures.  I found out that all four of the Mapper 23 VRC4 carts use the VRC4e submapper.  Mapper 23 includes VRC4f but there are no known examples (BTW, VRC4f = VRC2b).
This commit is contained in:
sanni 2020-03-03 11:16:27 +01:00
parent a8df8d215b
commit f9ca4f9108
2 changed files with 7 additions and 7 deletions
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8
Cart_Reader/Cart_Reader.ino
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@ -2,8 +2,8 @@
Cartridge Reader for Arduino Mega2560
Author: sanni
Date: 21.12.2019
Version: 4.4
Date: 03.03.2020
Version: 4.5
SD lib: https://github.com/greiman/SdFat
LCD lib: https://github.com/adafruit/Adafruit_SSD1306
@ -38,12 +38,12 @@
rama - code speedup & improvements
Gens-gs - Megadrive checksum
Modman - N64 checksum comparison fix
splash5 - EMS GB Smart cart support
splash5 - EMS GB Smart cart support, Wonderswan module
**********************************************************************************/
#include <SdFat.h>
char ver[5] = "4.4";
char ver[5] = "4.5";
/******************************************
Options

6
Cart_Reader/NES.ino
View File

@ -2101,17 +2101,17 @@ void readCHR() {
case 23: // 128K
// Detect VRC4e Carts - read PRG 0x1FFF6 (DATE)
// Boku Dracula-kun = 890810, Tiny Toon = 910809
// Crisis Force = 910701, Parodius Da! = 900916
write_prg_byte(0x8000, 15);
prgchk0 = read_prg_byte(0x9FF6);
prgchk1 = read_prg_byte(0x9FF7);
if ((prgchk0 == 0x30) && (prgchk1 == 0x38)) { // Check for "08" in middle of date
if (prgchk0 == 0x30) { // Check for "0" in middle of date
vrc4e = true; // VRC4e Cart
}
banks = int_pow(2, chrsize) * 4;
for (int i = 0; i < banks; i++) {
write_prg_byte(0xB000, i & 0xF); // CHR Bank Lower 4 bits
if (vrc4e == true)
write_prg_byte(0xB004, (i >> 4) & 0xF); // CHR Bank Upper 4 bits VRC4e (Boku Dracula-kun/Tiny Toon)
write_prg_byte(0xB004, (i >> 4) & 0xF); // CHR Bank Upper 4 bits VRC4e
else
write_prg_byte(0xB001, (i >> 4) & 0xF); // CHR Bank Upper 4 bits VRC2b/VRC4f
for (word address = 0x0; address < 0x400; address += 512) {