GRiD GRiDcase 1520 initial support (#269)

* add initial support for GRiD GRiDcase 1520 * add emulation of IDE HDD model Certain BIOSes like GRiD 1520 can only work with a limited selection of IDE hard drives. Add capability to emulate particular HDD model. Add 3 Conner drives that work with GRiD 1520.
sarah-walker-pcem · Nov 25, 2024 · dd1ef68 · dd1ef68
1 parent 1882f17
commit dd1ef68
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Showing 9 changed files with 377 additions and 2 deletions.
diff --git a/includes/private/ibm.h b/includes/private/ibm.h
@@ -192,6 +192,7 @@ enum {
         ROM_TG286M,
         ROM_AWARD286,
         ROM_GDC212M,
+        ROM_GRID1520,
         ROM_GW286CT,
         ROM_SPC4200P,
         ROM_SPC4216P,

diff --git a/includes/private/models/grid.h b/includes/private/models/grid.h
@@ -0,0 +1,5 @@
+#ifndef _GRID_H_
+#define _GRID_H_
+void grid_init();
+
+#endif /* _GRID_H_ */
diff --git a/src/devices/nvr.c b/src/devices/nvr.c
@@ -306,6 +306,10 @@ void loadnvr() {
                 f = nvrfopen("super286tr.nvr", "rb");
                 nvrmask = 127;
                 break;
+        case ROM_GRID1520:
+                f = nvrfopen("grid1520.nvr", "rb");
+                nvrmask = 127;
+                break;
         case ROM_GW286CT:
                 f = nvrfopen("gw286ct.nvr", "rb");
                 nvrmask = 127;
@@ -603,6 +607,9 @@ void savenvr() {
         case ROM_HYUNDAI_SUPER286TR:
                 f = nvrfopen("super286tr.nvr", "wb");
                 break;
+        case ROM_GRID1520:
+                f = nvrfopen("grid1520.nvr", "wb");
+                break;
         case ROM_GW286CT:
                 f = nvrfopen("gw286ct.nvr", "wb");
                 break;

diff --git a/src/ide/ide.c b/src/ide/ide.c
@@ -78,13 +78,30 @@ typedef struct IDE {
         atapi_device_t atapi;
 } IDE;
 
+typedef struct IDE_HDD_EMU {
+        int romset,
+        char *model;
+        int tracks, hpc, spt;
+} IDE_HDD_EMU;
+
 int cdrom_channel = 2;
 int zip_channel = -1;
 
 IDE ide_drives[7];
 
 IDE *ext_ide;
 
+/**
+ * Table of specific emulated HDD models, starting with Conner drives used
+ * by GRiD. Their BIOS only works with these, so this allows running GRiD
+ * BIOS unpatched.
+ */
+static IDE_HDD_EMU hddemu[] = {
+        { ROM_GRID1520, "Conner Peripherals 20MB - CP3024", 615, 4, 17 }, // type 2, 20MB
+        { ROM_GRID1520, "Conner Peripherals 40MB - CP3044", 980, 5, 17 }, // type 17, 
+        { ROM_GRID1520, "Conner Peripherals 104MB - CP3104", 776, 8, 33 }  // extended type 224 104MB
+};
+
 char ide_fn[7][512];
 
 int (*ide_bus_master_read_data)(int channel, uint8_t *data, int size, void *p);
@@ -151,6 +168,8 @@ void ide_padstr(char *str, const char *src, int len) {
  */
 static void ide_identify(IDE *ide) {
         memset(ide->buffer, 0, 512);
+        char *hdd_model = "PCemHD";
+        int h;
 
         // ide->buffer[1] = 101; /* Cylinders */
 
@@ -163,7 +182,16 @@ static void ide_identify(IDE *ide) {
 
         ide_padstr((char *)(ide->buffer + 10), "", 20);       /* Serial Number */
         ide_padstr((char *)(ide->buffer + 23), "v1.0", 8);    /* Firmware */
-        ide_padstr((char *)(ide->buffer + 27), "PCemHD", 40); /* Model */
+        for (h = 0; h < sizeof(hddemu) / sizeof(hddemu[0]); h++)
+                if (romset == hddemu[h].romset
+                        && hdc[cur_ide[ide->board]].tracks == hddemu[h].tracks
+                        && hdc[cur_ide[ide->board]].hpc == hddemu[h].hpc
+                        && hdc[cur_ide[ide->board]].spt == hddemu[h].spt) {
+                        hdd_model = hddemu[h].model;
+                        break;
+                }
+
+        ide_padstr((char *)(ide->buffer + 27), hdd_model, 40); /* Model */
 
         ide->buffer[0] = (1 << 6);             /*Fixed drive*/
         ide->buffer[20] = 3;                   /*Buffer type*/

diff --git a/src/keyboard/keyboard_at.c b/src/keyboard/keyboard_at.c
@@ -304,7 +304,6 @@ void keyboard_at_write(uint16_t port, uint8_t val, void *priv) {
                                 if (romset == ROM_T3100E)
                                         t3100e_mono_set(val);
                                 break;
-
                         case 0xcb: /*AMI - set keyboard mode*/
                                 break;
 
@@ -483,6 +482,10 @@ void keyboard_at_write(uint16_t port, uint8_t val, void *priv) {
                 keyboard_at.command = val;
                 /*New controller command*/
                 switch (val) {
+                case 0x09: /* GRID1520 - set backlight timeout */
+                        if (romset != ROM_GRID1520)
+                                pclog("Bad AT keyboard controller command %02X\n", val);
+                        break;
                 case 0x20:
                 case 0x21:
                 case 0x22:

diff --git a/src/memory/mem_bios.c b/src/memory/mem_bios.c
@@ -427,6 +427,14 @@ int loadbios() {
                 fclose(f);
                 return 1;
 
+        case ROM_GRID1520:
+                f = romfopen("grid1520/grid1520_891025.bin", "rb");
+                if (!f)
+                        break;
+                romfread(rom + 0x8000, 32768, 1, f);
+                fclose(f);
+                return 1;
+
         case ROM_HYUNDAI_SUPER286TR:
                 f = romfopen("super286tr/award.bin", "rb");
                 if (!f)