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Add BootROM support.

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This commit is contained in:
Matthieu Bucchianeri
2025-01-12 00:36:46 -08:00
committed by Ted Fried
parent 5662d3988e
commit d2f95788e5
7 changed files with 265 additions and 2 deletions
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18
XTMax/Code/XTMax/XTMax.ino
View File

@@ -37,7 +37,10 @@
//
// Revision 7 01/12/2025
// - Refactor SD card I/O
// - Add support for 16-bit EMS page offsets.
// - Add support for 16-bit EMS page offsets
//
// Revision 8 01/18/2024
// - Add support for BIOS ROM extension (Boot ROM)
//
// Revision 8 01/20/2025
// - Added chip select for a second PSRAM to allow access to 16 MB of Expanded RAM
@@ -71,6 +74,8 @@
#include <stdint.h>
#include <stdio.h>
#include "bootrom.h"
// Teensy 4.1 pin assignments
//
@@ -573,6 +578,16 @@ inline void Mem_Read_Cycle() {
GPIO8_DR = sd_pin_outputs + MUX_DATA_n_HIGH + CHRDY_OE_n_HIGH + DATA_OE_n_HIGH;
}
else if (isa_address>=BOOTROM_ADDR && isa_address<BOOTROM_ADDR+sizeof(BOOTROM)) { // Boot ROM
isa_data_out = BOOTROM[isa_address-BOOTROM_ADDR];
GPIO7_DR = GPIO7_DATA_OUT_UNSCRAMBLE + MUX_ADDR_n_LOW + CHRDY_OUT_LOW + trigger_out;
GPIO8_DR = sd_pin_outputs + MUX_DATA_n_HIGH + CHRDY_OE_n_HIGH + DATA_OE_n_LOW;
while ( (gpio9_int&0xF0) != 0xF0 ) { gpio9_int = GPIO9_DR; } // Wait here until cycle is complete
GPIO8_DR = sd_pin_outputs + MUX_DATA_n_HIGH + CHRDY_OE_n_HIGH + DATA_OE_n_HIGH;
}
return;
}
@@ -612,7 +627,6 @@ inline void Mem_Write_Cycle() {
GPIO7_DR = GPIO7_DATA_OUT_UNSCRAMBLE + MUX_ADDR_n_LOW + CHRDY_OUT_LOW + trigger_out;
GPIO8_DR = sd_pin_outputs + MUX_DATA_n_HIGH + CHRDY_OE_n_HIGH + DATA_OE_n_HIGH;
}
else if (isa_address<0xA0000) { // XTMax stores the full 640 KB conventional memory
GPIO7_DR = GPIO7_DATA_OUT_UNSCRAMBLE + MUX_ADDR_n_HIGH + CHRDY_OUT_LOW + trigger_out;
GPIO8_DR = sd_pin_outputs + MUX_DATA_n_LOW + CHRDY_OE_n_HIGH + DATA_OE_n_HIGH;

130
XTMax/Code/XTMax/bootrom.h Normal file
View File

@@ -0,0 +1,130 @@
#define BOOTROM_ADDR 0xCE000
unsigned char BOOTROM[] = {
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