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Optimize for 80186-compatible.

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This commit is contained in:
Matthieu Bucchianeri 2025-02-04 00:26:59 -08:00
parent 75288843f4
commit 1392520b6c
3 changed files with 181 additions and 116 deletions
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21
XTMax/Code/XTMax/XTMax.ino
View File

@ -197,7 +197,7 @@ uint8_t spi_shift_out =0;
uint8_t sd_spi_datain =0;
uint32_t sd_spi_cs_n = 0x0;
uint32_t sd_spi_dataout =0;
uint8_t sd_scratch_register[4] = {0, 0, 0, 0};
uint8_t sd_scratch_register[5] = {0, 0, 0, 0, 0};
uint8_t XTMax_MEM_Response_Array[16];
@ -681,10 +681,12 @@ inline void IO_Read_Cycle() {
switch (isa_address) {
case SD_BASE: // First two registers serve the same function (to allow use of Word I/O)
case SD_BASE+1: sd_spi_dataout = 0xff; SD_SPI_Cycle(); isa_data_out = sd_spi_datain; break;
case SD_BASE+4: isa_data_out = sd_scratch_register[0]; break;
case SD_BASE+5: isa_data_out = sd_scratch_register[1]; break;
case SD_BASE+6: isa_data_out = sd_scratch_register[2]; break;
case SD_BASE+7: isa_data_out = sd_scratch_register[3]; break;
case SD_BASE+2: break; // Write only
case SD_BASE+3: isa_data_out = sd_scratch_register[0]; break;
case SD_BASE+4: isa_data_out = sd_scratch_register[1]; break;
case SD_BASE+5: isa_data_out = sd_scratch_register[2]; break;
case SD_BASE+6: isa_data_out = sd_scratch_register[3]; break;
case SD_BASE+7: isa_data_out = sd_scratch_register[4]; break;
}
GPIO7_DR = GPIO7_DATA_OUT_UNSCRAMBLE + MUX_ADDR_n_LOW + CHRDY_OUT_LOW + trigger_out;
@ -745,10 +747,11 @@ inline void IO_Write_Cycle() {
case SD_BASE: // First two registers serve the same function (to allow use of Word I/O)
case SD_BASE+1: sd_spi_dataout = data_in; SD_SPI_Cycle(); break;
case SD_BASE+2: sd_spi_cs_n = data_in&0x1; break;
case SD_BASE+4: sd_scratch_register[0] = data_in; break;
case SD_BASE+5: sd_scratch_register[1] = data_in; break;
case SD_BASE+6: sd_scratch_register[2] = data_in; break;
case SD_BASE+7: sd_scratch_register[3] = data_in; break;
case SD_BASE+3: sd_scratch_register[0] = data_in; break;
case SD_BASE+4: sd_scratch_register[1] = data_in; break;
case SD_BASE+5: sd_scratch_register[2] = data_in; break;
case SD_BASE+6: sd_scratch_register[3] = data_in; break;
case SD_BASE+7: sd_scratch_register[4] = data_in; break;
}
//gpio9_int = GPIO9_DR;

202
XTMax/Code/XTMax/bootrom.h
View File

@ -1,97 +1,105 @@
#define BOOTROM_ADDR 0xCE000
unsigned char BOOTROM[] = {
85, 170, 4, 6, 80, 82, 250, 184, 200, 228, 232, 54, 4, 232, 57, 3,
115, 3, 233, 130, 0, 184, 10, 229, 232, 40, 4, 49, 192, 142, 192, 38,
161, 78, 0, 186, 132, 2, 239, 232, 55, 4, 184, 181, 229, 232, 19, 4,
38, 161, 76, 0, 186, 134, 2, 239, 232, 38, 4, 184, 185, 229, 232, 2,
4, 184, 31, 229, 232, 252, 3, 184, 0, 192, 38, 163, 78, 0, 232, 16,
4, 184, 181, 229, 232, 236, 3, 184, 156, 224, 38, 163, 76, 0, 232, 0,
4, 184, 185, 229, 232, 220, 3, 184, 52, 229, 232, 214, 3, 184, 0, 192,
38, 163, 6, 1, 232, 234, 3, 184, 181, 229, 232, 198, 3, 184, 81, 225,
38, 163, 4, 1, 232, 218, 3, 184, 185, 229, 232, 182, 3, 184, 64, 0,
142, 192, 38, 254, 6, 117, 0, 251, 90, 88, 7, 203, 85, 86, 128, 250,
128, 116, 28, 137, 197, 137, 214, 156, 14, 184, 189, 224, 80, 156, 186, 132,
2, 237, 80, 186, 134, 2, 237, 80, 137, 232, 137, 242, 207, 235, 56, 128,
252, 21, 126, 5, 232, 112, 0, 235, 34, 128, 252, 1, 116, 10, 128, 252,
21, 116, 5, 190, 235, 224, 235, 3, 190, 247, 224, 86, 83, 136, 227, 48,
255, 208, 227, 137, 222, 91, 46, 255, 164, 11, 225, 6, 190, 64, 0, 142,
198, 38, 136, 38, 116, 0, 7, 137, 229, 139, 118, 8, 156, 131, 230, 254,
157, 131, 214, 0, 86, 157, 94, 93, 202, 2, 0, 221, 226, 97, 225, 117,
225, 248, 225, 156, 226, 55, 225, 55, 225, 55, 225, 183, 226, 221, 226, 55,
225, 55, 225, 207, 226, 221, 226, 55, 225, 55, 225, 221, 226, 221, 226, 55,
225, 55, 225, 221, 226, 223, 226, 80, 184, 152, 229, 232, 5, 3, 88, 80,
136, 224, 48, 228, 232, 26, 3, 184, 185, 229, 232, 246, 2, 88, 233, 155,
1, 0, 4, 16, 0, 0, 255, 255, 0, 200, 0, 0, 0, 0, 0, 63,
0, 6, 189, 64, 0, 142, 197, 48, 228, 38, 134, 38, 116, 0, 132, 228,
116, 1, 249, 7, 195, 132, 192, 117, 3, 233, 112, 1, 80, 48, 228, 137,
198, 83, 232, 115, 1, 137, 197, 1, 240, 137, 222, 131, 211, 0, 232, 154,
1, 91, 88, 115, 3, 233, 88, 1, 83, 81, 82, 87, 80, 137, 193, 48,
237, 137, 223, 186, 130, 2, 176, 0, 238, 81, 137, 232, 137, 243, 177, 81,
232, 90, 2, 114, 50, 186, 128, 2, 185, 232, 3, 235, 3, 232, 117, 2,
236, 60, 254, 224, 248, 117, 32, 185, 0, 1, 252, 237, 171, 226, 252, 237,
131, 197, 1, 131, 214, 0, 89, 226, 208, 186, 130, 2, 176, 1, 238, 88,
95, 90, 89, 91, 233, 13, 1, 186, 130, 2, 176, 1, 238, 89, 88, 40,
200, 95, 90, 89, 91, 233, 240, 0, 132, 192, 117, 3, 233, 237, 0, 80,
48, 228, 137, 198, 83, 232, 240, 0, 137, 197, 1, 240, 137, 222, 131, 211,
0, 232, 23, 1, 91, 88, 115, 3, 233, 213, 0, 30, 83, 81, 82, 87,
80, 137, 193, 48, 237, 137, 223, 140, 192, 142, 216, 186, 130, 2, 176, 0,
238, 81, 137, 232, 137, 243, 177, 88, 232, 210, 1, 114, 78, 186, 128, 2,
176, 254, 238, 185, 0, 1, 135, 247, 252, 173, 239, 226, 252, 135, 254, 186,
128, 2, 185, 196, 9, 235, 3, 232, 219, 1, 236, 60, 255, 225, 248, 36,
31, 60, 5, 117, 38, 185, 196, 9, 235, 3, 232, 200, 1, 236, 132, 192,
225, 248, 116, 23, 131, 197, 1, 131, 214, 0, 89, 226, 180, 186, 130, 2,
176, 1, 238, 88, 95, 90, 89, 91, 31, 235, 105, 186, 130, 2, 176, 1,
238, 89, 88, 40, 200, 95, 90, 89, 91, 31, 235, 76, 132, 192, 116, 76,
80, 48, 228, 137, 197, 83, 232, 79, 0, 1, 232, 131, 211, 0, 232, 122,
0, 91, 88, 114, 59, 235, 61, 182, 15, 6, 184, 64, 0, 142, 192, 38,
138, 22, 117, 0, 7, 254, 194, 181, 254, 177, 255, 49, 192, 248, 195, 80,
83, 232, 36, 0, 232, 84, 0, 91, 88, 114, 21, 235, 23, 235, 21, 180,
3, 232, 94, 0, 135, 209, 248, 195, 180, 170, 249, 195, 180, 1, 249, 195,
180, 4, 249, 195, 48, 228, 248, 195, 49, 192, 49, 219, 82, 81, 82, 136,
200, 36, 192, 209, 224, 209, 224, 136, 232, 185, 16, 0, 247, 225, 90, 136,
241, 48, 237, 1, 200, 177, 63, 247, 225, 89, 81, 48, 237, 128, 225, 63,
73, 1, 200, 131, 210, 0, 137, 211, 89, 90, 195, 81, 82, 232, 18, 0,
57, 211, 114, 10, 119, 4, 57, 200, 114, 4, 249, 90, 89, 195, 248, 90,
89, 195, 186, 15, 0, 185, 16, 188, 195, 80, 30, 83, 81, 82, 86, 184,
0, 192, 142, 216, 186, 130, 2, 176, 1, 238, 49, 201, 186, 232, 3, 180,
134, 205, 21, 186, 128, 2, 176, 255, 185, 80, 0, 238, 226, 253, 186, 130,
2, 176, 0, 238, 190, 245, 227, 185, 1, 0, 180, 1, 232, 79, 0, 114,
54, 190, 251, 227, 185, 5, 0, 180, 1, 232, 66, 0, 114, 41, 187, 100,
0, 190, 1, 228, 185, 1, 0, 180, 1, 232, 50, 0, 190, 7, 228, 185,
1, 0, 180, 0, 232, 39, 0, 115, 14, 156, 49, 201, 186, 232, 3, 180,
134, 205, 21, 157, 75, 117, 218, 94, 90, 89, 91, 31, 114, 8, 184, 86,
229, 232, 127, 0, 88, 195, 184, 121, 229, 232, 119, 0, 88, 195, 186, 128,
2, 176, 255, 238, 81, 185, 6, 0, 252, 172, 238, 226, 252, 185, 8, 0,
236, 60, 255, 225, 251, 89, 56, 224, 118, 3, 249, 235, 4, 248, 236, 226,
253, 176, 255, 238, 195, 64, 0, 0, 0, 0, 149, 72, 0, 0, 1, 170,
135, 119, 0, 0, 0, 0, 1, 105, 64, 0, 0, 0, 1, 186, 128, 2,
80, 176, 255, 238, 136, 200, 238, 136, 248, 238, 136, 216, 238, 88, 134, 224,
238, 134, 224, 238, 176, 1, 238, 185, 8, 0, 236, 60, 255, 225, 251, 132,
192, 116, 1, 249, 195, 81, 82, 49, 201, 186, 100, 0, 180, 134, 205, 21,
90, 89, 195, 156, 30, 83, 86, 137, 198, 184, 0, 192, 142, 216, 180, 14,
49, 219, 252, 172, 8, 192, 116, 4, 205, 16, 235, 247, 94, 91, 31, 157,
195, 156, 30, 83, 81, 82, 86, 137, 194, 184, 0, 192, 142, 216, 49, 219,
252, 137, 214, 177, 12, 211, 238, 131, 230, 15, 138, 132, 184, 228, 180, 14,
205, 16, 137, 214, 177, 8, 211, 238, 131, 230, 15, 138, 132, 184, 228, 180,
14, 205, 16, 137, 214, 177, 4, 211, 238, 131, 230, 15, 138, 132, 184, 228,
180, 14, 205, 16, 137, 214, 131, 230, 15, 138, 132, 184, 228, 180, 14, 205,
16, 94, 90, 89, 91, 31, 157, 195, 48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 65, 66, 67, 68, 69, 70, 66, 111, 111, 116, 82, 79, 77, 32,
102, 111, 114, 32, 88, 84, 77, 97, 120, 32, 118, 49, 46, 48, 13, 10,
67, 111, 112, 121, 114, 105, 103, 104, 116, 32, 40, 99, 41, 32, 50, 48,
50, 53, 32, 77, 97, 116, 116, 104, 105, 101, 117, 32, 66, 117, 99, 99,
104, 105, 97, 110, 101, 114, 105, 13, 10, 0, 79, 108, 100, 32, 73, 78,
84, 49, 51, 104, 32, 86, 101, 99, 116, 111, 114, 32, 61, 32, 0, 78,
101, 119, 32, 73, 78, 84, 49, 51, 104, 32, 86, 101, 99, 116, 111, 114,
32, 61, 32, 0, 78, 101, 119, 32, 70, 105, 120, 101, 100, 32, 68, 105,
115, 107, 32, 80, 97, 114, 97, 109, 101, 116, 101, 114, 32, 84, 97, 98,
108, 101, 32, 61, 32, 0, 83, 68, 32, 67, 97, 114, 100, 32, 105, 110,
105, 116, 105, 97, 108, 105, 122, 101, 100, 32, 115, 117, 99, 99, 101, 115,
115, 102, 117, 108, 108, 121, 13, 10, 0, 83, 68, 32, 67, 97, 114, 100,
32, 102, 97, 105, 108, 101, 100, 32, 116, 111, 32, 105, 110, 105, 116, 105,
97, 108, 105, 122, 101, 13, 10, 0, 85, 110, 115, 117, 112, 112, 111, 114,
116, 101, 100, 32, 73, 78, 84, 49, 51, 104, 32, 70, 117, 110, 99, 116,
105, 111, 110, 32, 0, 58, 0, 32, 0, 13, 10, 0, 0, 0, 0, 0,
85, 170, 4, 6, 80, 82, 250, 184, 27, 229, 232, 137, 4, 232, 140, 3,
115, 3, 233, 188, 0, 84, 88, 57, 224, 116, 39, 62, 161, 255, 255, 62,
199, 6, 255, 255, 170, 170, 62, 128, 62, 0, 0, 170, 62, 163, 255, 255,
116, 2, 235, 14, 80, 48, 192, 176, 64, 246, 224, 88, 116, 4, 48, 210,
235, 8, 178, 1, 184, 93, 229, 232, 76, 4, 184, 131, 2, 146, 238, 184,
130, 229, 232, 65, 4, 49, 192, 142, 192, 38, 161, 78, 0, 186, 132, 2,
239, 232, 80, 4, 184, 45, 230, 232, 44, 4, 38, 161, 76, 0, 186, 134,
2, 239, 232, 63, 4, 184, 49, 230, 232, 27, 4, 184, 151, 229, 232, 21,
4, 184, 0, 192, 38, 163, 78, 0, 232, 41, 4, 184, 45, 230, 232, 5,
4, 184, 214, 224, 38, 163, 76, 0, 232, 25, 4, 184, 49, 230, 232, 245,
3, 184, 172, 229, 232, 239, 3, 184, 0, 192, 38, 163, 6, 1, 232, 3,
4, 184, 45, 230, 232, 223, 3, 184, 139, 225, 38, 163, 4, 1, 232, 243,
3, 184, 49, 230, 232, 207, 3, 184, 64, 0, 142, 192, 38, 254, 6, 117,
0, 251, 90, 88, 7, 203, 85, 86, 128, 250, 128, 116, 28, 137, 197, 137,
214, 156, 14, 184, 247, 224, 80, 156, 186, 132, 2, 237, 80, 186, 134, 2,
237, 80, 137, 232, 137, 242, 207, 235, 56, 128, 252, 21, 126, 5, 232, 112,
0, 235, 34, 128, 252, 1, 116, 10, 128, 252, 21, 116, 5, 190, 37, 225,
235, 3, 190, 49, 225, 86, 83, 136, 227, 48, 255, 208, 227, 137, 222, 91,
46, 255, 164, 69, 225, 6, 190, 64, 0, 142, 198, 38, 136, 38, 116, 0,
7, 137, 229, 139, 118, 8, 156, 131, 230, 254, 157, 131, 214, 0, 86, 157,
94, 93, 202, 2, 0, 48, 227, 155, 225, 175, 225, 64, 226, 239, 226, 113,
225, 113, 225, 113, 225, 10, 227, 48, 227, 113, 225, 113, 225, 34, 227, 48,
227, 113, 225, 113, 225, 48, 227, 48, 227, 113, 225, 113, 225, 48, 227, 50,
227, 80, 184, 16, 230, 232, 30, 3, 88, 80, 136, 224, 48, 228, 232, 51,
3, 184, 49, 230, 232, 15, 3, 88, 233, 180, 1, 0, 4, 16, 0, 0,
255, 255, 0, 200, 0, 0, 0, 0, 0, 63, 0, 6, 189, 64, 0, 142,
197, 48, 228, 38, 134, 38, 116, 0, 132, 228, 116, 1, 249, 7, 195, 132,
192, 117, 3, 233, 137, 1, 80, 48, 228, 137, 198, 83, 232, 140, 1, 137,
197, 1, 240, 137, 222, 131, 211, 0, 232, 179, 1, 91, 88, 115, 3, 233,
113, 1, 83, 81, 82, 87, 80, 137, 193, 48, 237, 137, 223, 186, 130, 2,
176, 0, 238, 81, 137, 232, 137, 243, 177, 81, 232, 115, 2, 114, 64, 186,
128, 2, 185, 232, 3, 235, 3, 232, 142, 2, 236, 60, 254, 224, 248, 117,
46, 185, 0, 1, 82, 186, 131, 2, 236, 90, 132, 192, 252, 116, 4, 243,
109, 235, 4, 237, 171, 226, 252, 237, 131, 197, 1, 131, 214, 0, 89, 226,
194, 186, 130, 2, 176, 1, 238, 88, 95, 90, 89, 91, 233, 24, 1, 186,
130, 2, 176, 1, 238, 89, 88, 40, 200, 95, 90, 89, 91, 233, 251, 0,
132, 192, 117, 3, 233, 248, 0, 80, 48, 228, 137, 198, 83, 232, 251, 0,
137, 197, 1, 240, 137, 222, 131, 211, 0, 232, 34, 1, 91, 88, 115, 3,
233, 224, 0, 30, 83, 81, 82, 87, 80, 137, 193, 48, 237, 137, 223, 140,
192, 142, 216, 186, 130, 2, 176, 0, 238, 81, 137, 232, 137, 243, 177, 88,
232, 221, 1, 114, 89, 186, 128, 2, 176, 254, 238, 185, 0, 1, 135, 247,
82, 186, 131, 2, 236, 90, 132, 192, 252, 116, 4, 243, 111, 235, 4, 173,
239, 226, 252, 135, 254, 185, 196, 9, 235, 3, 232, 219, 1, 236, 60, 255,
225, 248, 36, 31, 60, 5, 117, 38, 185, 196, 9, 235, 3, 232, 200, 1,
236, 132, 192, 225, 248, 116, 23, 131, 197, 1, 131, 214, 0, 89, 226, 169,
186, 130, 2, 176, 1, 238, 88, 95, 90, 89, 91, 31, 235, 105, 186, 130,
2, 176, 1, 238, 89, 88, 40, 200, 95, 90, 89, 91, 31, 235, 76, 132,
192, 116, 76, 80, 48, 228, 137, 197, 83, 232, 79, 0, 1, 232, 131, 211,
0, 232, 122, 0, 91, 88, 114, 59, 235, 61, 182, 15, 6, 184, 64, 0,
142, 192, 38, 138, 22, 117, 0, 7, 254, 194, 181, 254, 177, 255, 49, 192,
248, 195, 80, 83, 232, 36, 0, 232, 84, 0, 91, 88, 114, 21, 235, 23,
235, 21, 180, 3, 232, 94, 0, 135, 209, 248, 195, 180, 170, 249, 195, 180,
1, 249, 195, 180, 4, 249, 195, 48, 228, 248, 195, 49, 192, 49, 219, 82,
81, 82, 136, 200, 36, 192, 209, 224, 209, 224, 136, 232, 185, 16, 0, 247,
225, 90, 136, 241, 48, 237, 1, 200, 177, 63, 247, 225, 89, 81, 48, 237,
128, 225, 63, 73, 1, 200, 131, 210, 0, 137, 211, 89, 90, 195, 81, 82,
232, 18, 0, 57, 211, 114, 10, 119, 4, 57, 200, 114, 4, 249, 90, 89,
195, 248, 90, 89, 195, 186, 15, 0, 185, 16, 188, 195, 80, 30, 83, 81,
82, 86, 184, 0, 192, 142, 216, 186, 130, 2, 176, 1, 238, 49, 201, 186,
232, 3, 180, 134, 205, 21, 186, 128, 2, 176, 255, 185, 80, 0, 238, 226,
253, 186, 130, 2, 176, 0, 238, 190, 72, 228, 185, 1, 0, 180, 1, 232,
79, 0, 114, 54, 190, 78, 228, 185, 5, 0, 180, 1, 232, 66, 0, 114,
41, 187, 100, 0, 190, 84, 228, 185, 1, 0, 180, 1, 232, 50, 0, 190,
90, 228, 185, 1, 0, 180, 0, 232, 39, 0, 115, 14, 156, 49, 201, 186,
232, 3, 180, 134, 205, 21, 157, 75, 117, 218, 94, 90, 89, 91, 31, 114,
8, 184, 206, 229, 232, 127, 0, 88, 195, 184, 241, 229, 232, 119, 0, 88,
195, 186, 128, 2, 176, 255, 238, 81, 185, 6, 0, 252, 172, 238, 226, 252,
185, 8, 0, 236, 60, 255, 225, 251, 89, 56, 224, 118, 3, 249, 235, 4,
248, 236, 226, 253, 176, 255, 238, 195, 64, 0, 0, 0, 0, 149, 72, 0,
0, 1, 170, 135, 119, 0, 0, 0, 0, 1, 105, 64, 0, 0, 0, 1,
186, 128, 2, 80, 176, 255, 238, 136, 200, 238, 136, 248, 238, 136, 216, 238,
88, 134, 224, 238, 134, 224, 238, 176, 1, 238, 185, 8, 0, 236, 60, 255,
225, 251, 132, 192, 116, 1, 249, 195, 81, 82, 49, 201, 186, 100, 0, 180,
134, 205, 21, 90, 89, 195, 156, 30, 83, 86, 137, 198, 184, 0, 192, 142,
216, 180, 14, 49, 219, 252, 172, 8, 192, 116, 4, 205, 16, 235, 247, 94,
91, 31, 157, 195, 156, 30, 83, 81, 82, 86, 137, 194, 184, 0, 192, 142,
216, 49, 219, 252, 137, 214, 177, 12, 211, 238, 131, 230, 15, 138, 132, 11,
229, 180, 14, 205, 16, 137, 214, 177, 8, 211, 238, 131, 230, 15, 138, 132,
11, 229, 180, 14, 205, 16, 137, 214, 177, 4, 211, 238, 131, 230, 15, 138,
132, 11, 229, 180, 14, 205, 16, 137, 214, 131, 230, 15, 138, 132, 11, 229,
180, 14, 205, 16, 94, 90, 89, 91, 31, 157, 195, 48, 49, 50, 51, 52,
53, 54, 55, 56, 57, 65, 66, 67, 68, 69, 70, 66, 111, 111, 116, 82,
79, 77, 32, 102, 111, 114, 32, 88, 84, 77, 97, 120, 32, 118, 49, 46,
48, 13, 10, 67, 111, 112, 121, 114, 105, 103, 104, 116, 32, 40, 99, 41,
32, 50, 48, 50, 53, 32, 77, 97, 116, 116, 104, 105, 101, 117, 32, 66,
117, 99, 99, 104, 105, 97, 110, 101, 114, 105, 13, 10, 0, 67, 80, 85,
32, 115, 117, 112, 112, 111, 114, 116, 115, 32, 73, 78, 83, 47, 79, 85,
84, 83, 32, 105, 110, 115, 116, 114, 117, 99, 116, 105, 111, 110, 115, 13,
10, 0, 79, 108, 100, 32, 73, 78, 84, 49, 51, 104, 32, 86, 101, 99,
116, 111, 114, 32, 61, 32, 0, 78, 101, 119, 32, 73, 78, 84, 49, 51,
104, 32, 86, 101, 99, 116, 111, 114, 32, 61, 32, 0, 78, 101, 119, 32,
70, 105, 120, 101, 100, 32, 68, 105, 115, 107, 32, 80, 97, 114, 97, 109,
101, 116, 101, 114, 32, 84, 97, 98, 108, 101, 32, 61, 32, 0, 83, 68,
32, 67, 97, 114, 100, 32, 105, 110, 105, 116, 105, 97, 108, 105, 122, 101,
100, 32, 115, 117, 99, 99, 101, 115, 115, 102, 117, 108, 108, 121, 13, 10,
0, 83, 68, 32, 67, 97, 114, 100, 32, 102, 97, 105, 108, 101, 100, 32,
116, 111, 32, 105, 110, 105, 116, 105, 97, 108, 105, 122, 101, 13, 10, 0,
85, 110, 115, 117, 112, 112, 111, 114, 116, 101, 100, 32, 73, 78, 84, 49,
51, 104, 32, 70, 117, 110, 99, 116, 105, 111, 110, 32, 0, 58, 0, 32,
0, 13, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
@ -119,12 +127,4 @@ unsigned char BOOTROM[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 216};
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 157};

74
XTMax/Drivers/BootROM/bootrom.asm
View File

@ -83,10 +83,48 @@ entry:
mov ax, welcome_msg
call print_string
;
; Initialize the SD Card.
;
call init_sd
%ifndef AS_COM_PROGRAM
jc .skip
%endif
;
; Detecting 80186-compatible so we can use REP INSW/OUTSW.
; Based on https://www.rcollins.org/ftp/source/cpuid/cpuid.asm
;
.cpuid:
push sp
pop ax
cmp ax, sp ; if below 80286, these values will differ
jz .support_string_io ; nope, 80286 or higher
mov ax, ds:[0xffff] ; get original data
mov word ds:[0xffff], 0xaaaa ; write signature at test location
cmp byte ds:[0], 0xaa ; 8086 will write the 2nd byte at offset 0
mov ds:[0xffff], ax
je .test_v20
jmp .support_string_io ; we have an 80186/80188
.test_v20:
push ax ; save results
xor al, al ; force ZF
mov al, 0x40 ; multiplicand
mul al ; V20 doesn't affect ZF
pop ax ; restore results
jz .support_string_io ; we have an V20
xor dl, dl
jmp .store_string_io
.support_string_io:
mov dl, 1
mov ax, string_io_msg
call print_string
.store_string_io:
mov ax, 0x283 ; scratch register 0
xchg ax, dx
out dx, al ; save capability
%ifndef AS_COM_PROGRAM
;
; Install our BIOS INT13h hook into the interrupt vector table.
;
@ -98,13 +136,13 @@ entry:
mov es, ax
mov ax, es:[0x13*4+2]
mov dx, 0x284 ; scratch register 0
mov dx, 0x284 ; scratch register 1-2
out dx, ax ; save segment
call print_hex
mov ax, colon
call print_string
mov ax, es:[0x13*4]
mov dx, 0x286 ; scratch register 2
mov dx, 0x286 ; scratch register 3-4
out dx, ax ; save offset
call print_hex
mov ax, newline
@ -245,14 +283,14 @@ int13h_entry:
; Simulate INT 13h with the original vector.
;
pushf ; setup for iret below
mov dx, 0x284 ; scratch register 0
mov dx, 0x284 ; scratch register 1-2
%ifndef AS_COM_PROGRAM
in ax, dx
%else
mov ax, cs
%endif
push ax ; setup for iret below
mov dx, 0x286 ; scratch register 2
mov dx, 0x286 ; scratch register 3-4
%ifndef AS_COM_PROGRAM
in ax, dx
%else
@ -502,11 +540,23 @@ func_02_read_sector:
call print_string
%endif
mov cx, 256 ; block size (in words)
push dx
mov dx, 0x283 ; scratch register 0
in al, dx
pop dx
test al, al ; supports insw?
cld
jz .receive_block
.receive_block_fast:
cpu 186
rep insw
cpu 8086
jmp .receive_crc
.receive_block:
in ax, dx
stosw
loop .receive_block
.receive_crc:
in ax, dx ; discard CRC
add TEMP_LO, 1 ; next block
adc TEMP_HI, 0 ; carry
@ -605,17 +655,28 @@ func_03_write_sector:
out dx, al
mov cx, 256 ; block size (in words)
xchg di, si ; save si (aka TEMP1)
push dx
mov dx, 0x283 ; scratch register 0
in al, dx
pop dx
test al, al ; supports outsw?
cld
jz .send_block
.send_block_fast:
cpu 186
rep outsw
cpu 8086
jmp .end_send_block
.send_block:
lodsw
out dx, ax
loop .send_block
.end_send_block:
xchg si, di ; restore si (aka TEMP1)
%ifdef DEBUG_IO
mov ax, wait_msg
call print_string
%endif
mov dx, 0x280 ; data port
mov cx, 2500 ; timeout
jmp .receive_status_no_delay
.receive_status:
@ -1205,6 +1266,7 @@ debug_handler:
welcome_msg db 'BootROM for XTMax v1.0', 0xD, 0xA
db 'Copyright (c) 2025 Matthieu Bucchianeri', 0xD, 0xA, 0
string_io_msg db 'CPU supports INS/OUTS instructions', 0xD, 0xA, 0
old_13h_msg db 'Old INT13h Vector = ', 0
new_13h_msg db 'New INT13h Vector = ', 0
new_fdpt_msg db 'New Fixed Disk Parameter Table = ', 0