mirror of
https://github.com/garrettsworkshop/GWRAM.SYSTEM.git
synced 2024-09-28 00:54:47 +00:00
254 lines
5.8 KiB
C
254 lines
5.8 KiB
C
#include <stdlib.h>
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#include <conio.h>
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#include <string.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <stdint.h>
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#define true 1
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#define false 0
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#define VBL ((signed char*)0xC019)
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const uint8_t SPIN_HALFCYCLES = 3;
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const uint8_t SPIN_FRAMESPERCHAR = 4;
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#define PB0 ((char*)0xC061)
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#define PB1 ((char*)0xC062)
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static char read_applekey(void) { return (*PB0 | *PB1) & 0x80; }
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char _cmd;
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char _arg;
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/* ram2e_cmd(...) issues a coded command+argument sequence to the RAM2E */
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static void ram2e_cmd(char cmd, char arg) {
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// Load operation and data bytes into X and Y registers
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// in preparation for command sequence
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_cmd = cmd;
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_arg = arg;
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__asm__("ldx %v", _cmd); // X = command
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__asm__("ldy %v", _arg); // Y = argument
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// First, reset command sequence just in case it,
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// for some reason, has not timed out. (e.g. crazy fast accelerator?)
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// Write 0 twice because command and argument steps always advance seq.
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__asm__("lda #0");
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__asm__("sta $C073");
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__asm__("sta $C073");
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// Command sequence
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__asm__("lda #$FF");
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__asm__("sta $C073");
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__asm__("lda #$00");
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__asm__("sta $C073");
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__asm__("lda #$55");
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__asm__("sta $C073");
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__asm__("lda #$AA");
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__asm__("sta $C073");
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__asm__("lda #$C1");
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__asm__("sta $C073");
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__asm__("lda #$AD");
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__asm__("sta $C073");
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// Command
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__asm__("stx $C073");
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// Argument
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__asm__("sty $C073");
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// Reset RAMWorks bank register just in case
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__asm__("lda #0");
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__asm__("sta $C073");
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}
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/* set_mask_temp(...) sends the "Set RAMWorks Capacity Mask" to the RAM2E */
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static void set_mask_temp(char mask) { ram2e_cmd(0xE0, mask); }
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/* ufm_bitbang(...) sends the "Set UFM Bitbang Outputs" to the RAM2E */
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static void ufm_bitbang(char bitbang) { ram2e_cmd(0xEA, bitbang); }
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/* ufm_program(...) sends the "UFM Program Once" command to the RAM2E */
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static void ufm_program() { ram2e_cmd(0xEF, 0x00); }
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/* ufm_erase(...) sends the "UFM Erase Once" command to the RAM2E */
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static void ufm_erase() { ram2e_cmd(0xEE, 0x00); }
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/* set_mask_temp(...) sends the "Set RAMWorks Capacity Mask" */
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static void set_nvm(char mask) {
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int i;
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// Shift mask OR'd with data register clock pulse trigger into UFMD twice
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for (i = 0; i < 2; i++) {
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ufm_bitbang(0x80 | ((mask >> 1) & 0x40));
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ufm_bitbang(0x80 | ((mask >> 0) & 0x40));
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ufm_bitbang(0x80 | ((mask << 1) & 0x40));
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ufm_bitbang(0x80 | ((mask << 2) & 0x40));
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ufm_bitbang(0x80 | ((mask << 3) & 0x40));
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ufm_bitbang(0x80 | ((mask << 4) & 0x40));
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ufm_bitbang(0x80 | ((mask << 5) & 0x40));
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ufm_bitbang(0x80 | ((mask << 6) & 0x40));
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}
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// Program UFM
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ufm_program();
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}
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static void menu(void)
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{
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gotoxy(5, 1);
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cputs("-- RAM2E Capacity Settings --");
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gotoxy(1, 4);
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cputs("Select desired memory capacity:");
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gotoxy(4, 6);
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cputs("1. 64 kilobytes");
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gotoxy(4, 8);
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cputs("2. 512 kilobytes");
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gotoxy(4, 10);
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cputs("3. 1 megabyte");
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gotoxy(4, 12);
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cputs("4. 4 megabytes");
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gotoxy(4, 14);
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cputs("5. 8 megabytes");
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gotoxy(1, 17);
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cputs("Capacity will be saved until power-off.");
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gotoxy(1, 19);
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cputs("To remember capacity setting in");
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gotoxy(1, 20);
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cputs("nonvolatile memory, press Apple+number.");
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gotoxy(1, 22);
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cputs("Press [Q] to quit without saving.");
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}
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static void spin(uint8_t x, uint8_t y) {
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char i;
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// Sync to frame before starting
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while (*VBL >= 0);
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// Wait and animate spinner.
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// Spin_half
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for (i = 0; i < SPIN_HALFCYCLES; i++) {
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char j;
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for (j = 0; j < 4; j++) {
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char spinchar;
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char k;
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// Assign spinner char based on j
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switch (j) {
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case 0: spinchar = '\\'; break;
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case 1: spinchar = '|'; break;
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case 2: spinchar = '/'; break;
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case 3: spinchar = '-'; break;
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default: spinchar = '-'; break;
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}
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// Write it to screen
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gotoxy(x, y);
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putchar(spinchar);
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// Wait specificed number of frames
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for (k = 0; k < SPIN_FRAMESPERCHAR; k++) {
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while (*VBL < 0);
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while (*VBL >= 0);
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}
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}
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}
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// Wait a frame when finished
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while (*VBL < 0);
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while (*VBL >= 0);
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}
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int main(void)
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{
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char mask;
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char nvm;
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int reset_count;
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// First clear screen
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clrscr();
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// Make sure we are running on an Apple IIe
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if((get_ostype() & 0xF0) != APPLE_IIE) {
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// If not on Apple IIe, show an error message and quit
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gotoxy(0, 8);
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cputs(" THIS PROGRAM REQUIRES AN APPLE IIE.");
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gotoxy(0, 10);
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cputs(" PRESS ANY KEY TO QUIT.");
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cgetc(); // Wait for key
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clrscr(); // Clear screen before quitting
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return EXIT_SUCCESS;
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}
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// Show menu
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menu();
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// Get user choice from menu
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mask = 0;
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nvm = 0;
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reset_count = 0;
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while (true) {
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// Set capacity mask or quit according to keypress.
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switch (toupper(cgetc())) {
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case 'Q' : {
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clrscr();
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return EXIT_SUCCESS;
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}
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case '1': mask = 0x00; break;
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case '2': mask = 0x07; break;
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case '3': mask = 0x0F; break;
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case '4': mask = 0x3F; break;
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case '5': mask = 0x7F; break;
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case 'R': {
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if (reset_count > 127) {
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ufm_erase();
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reset_count = 0;
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} else { reset_count++; }
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} default: continue;
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}
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// Check if pressed with apple key.
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// If so, save to nonvolatile memory.
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if (read_applekey()) { nvm = true; }
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break;
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}
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// Set capacity in volatile memory.
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set_mask_temp(mask);
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// Clear screen in preparation to show saving or success message.
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clrscr();
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if (nvm) { // Save in NVM if requested.
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// Show message about saving.
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gotoxy(1, 8);
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cputs("Saving RAM2E capacity setting.");
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gotoxy(1, 9);
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cputs("Do not turn off your Apple.");
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// Save capacity in nonvolatile memory.
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set_nvm(mask);
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// Wait for >= 500ms on even the fastest systems.
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spin(32, 8);
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// Clear screen again.
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clrscr();
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gotoxy(1, 8);
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cputs("RAM2E capacity saved successfully.");
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} else { // Print success message if not saving in NVM.
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gotoxy(1, 8);
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cputs("RAM2E capacity set successfully.");
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}
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gotoxy(1, 10);
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cputs("Press any key to quit.");
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gotoxy(1, 11);
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cputs("You may also turn off your Apple.");
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cgetc();
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// Quit
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clrscr();
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return EXIT_SUCCESS;
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}
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