1 ; **************************************************************************** 2 ; edid.asm - TRDOS 386 (TRDOS v2.0.3) Test Program - MSDOS version 3 ; ---------------------------------------------------------------------------- 4 ; 5 ; 19/01/2021 (Erdogan Tan) 6 ; 7 ; **************************************************************************** 8 9 ;======================================================================== 10 ; READ VESA EDID (MONITOR INFO) 11 ;======================================================================== 12 13 ; Modified from TRDOS 386 version (edid.s) 14 15 [BITS 16] 16 17 [ORG 100h] 18 START_CODE: 19 00000000 BE[7F00] mov si, TrDOS_Welcome 20 00000003 E82B00 call print_msg 21 22 ; Read EDID 23 00000006 B8154F mov ax, 4F15h 24 00000009 B301 mov bl, 01h 25 0000000B 31D2 xor dx, dx 26 0000000D 31C9 xor cx, cx 27 ;push cs 28 ;pop es 29 0000000F BF[7401] mov di, edid_buffer 30 00000012 CD10 int 10h 31 32 00000014 83F84F cmp ax, 4Fh 33 00000017 7510 jne short edid_read_error 34 35 00000019 BE[DD00] mov si, edid_header 36 0000001C E81200 call print_msg 37 38 0000001F BE[7401] mov si, edid_buffer 39 00000022 E81B00 call convert_to_hex_tbl 40 41 terminate: 42 00000025 CD20 int 20h 43 here: 44 00000027 EBFE jmp short here 45 46 edid_read_error: 47 00000029 BE[2C01] mov si, edid_rerr_msg 48 0000002C E80200 call print_msg 49 0000002F EBF4 jmp short terminate 50 51 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 52 ; Subroutine - print text/message on display 53 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 54 55 print_msg: 56 00000031 BB0700 mov bx, 07h 57 00000034 B40E mov ah, 0Eh 58 ploop: 59 00000036 AC lodsb 60 00000037 08C0 or al, al 61 00000039 7404 jz short pexit 62 0000003B CD10 int 10h 63 0000003D EBF7 jmp short ploop 64 pexit: 65 0000003F C3 retn 66 67 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 68 ; Subroutine - Convert to hexadecimal character table 69 ;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 70 71 convert_to_hex_tbl: 72 ; si = binary table address 73 74 00000040 B90800 mov cx, 8 75 _h_1: 76 00000043 51 push cx 77 00000044 B110 mov cl, 16 78 00000046 BF[E700] mov di, edid_row_chars - 2 79 _h_2: 80 ;add di, 2 81 00000049 47 inc di 82 0000004A 47 inc di 83 0000004B AC lodsb 84 0000004C 30FF xor bh, bh 85 0000004E 88C3 mov bl, al 86 00000050 80E30F and bl, 0Fh ; low 4 bits 87 88 00000053 8AA7[6F00] mov ah, [_hexchars+bx] 89 00000057 C0E804 shr al, 4 ; high 4 bits 90 0000005A 88C3 mov bl, al 91 0000005C 8A87[6F00] mov al, [_hexchars+bx] 92 00000060 AB stosw 93 00000061 E2E6 loop _h_2 94 95 00000063 56 push si 96 00000064 BE[E800] mov si, edid_row 97 00000067 E8C7FF call print_msg 98 0000006A 5E pop si 99 100 0000006B 59 pop cx 101 0000006C E2D5 loop _h_1 102 103 0000006E C3 retn 104 105 _hexchars: 106 0000006F 303132333435363738- db "0123456789ABCDEF" 106 00000078 39414243444546 107 108 ;============================================================================= 109 ; initialized data 110 ;============================================================================= 111 112 ;----------------------------------------------------------------------------- 113 ; MESSAGES 114 ;----------------------------------------------------------------------------- 115 116 TrDOS_Welcome: 117 0000007F 0D0A db 0Dh, 0Ah 118 00000081 564553412045444944- db "VESA EDID reading program for TRDOS 386 v2 (MSDOS version)" 118 0000008A 2072656164696E6720- 118 00000093 70726F6772616D2066- 118 0000009C 6F72205452444F5320- 118 000000A5 33383620763220284D- 118 000000AE 53444F532076657273- 118 000000B7 696F6E29 119 000000BB 0D0A db 0Dh, 0Ah 120 000000BD 6279204572646F6761- db "by Erdogan TAN (19/01/2021)" 120 000000C6 6E2054414E20283139- 120 000000CF 2F30312F3230323129 121 000000D8 0D0A0D0A00 db 0Dh, 0Ah, 0Dh, 0Ah, 0 122 123 edid_header: 124 000000DD 45444944203A0D0A0D- db "EDID :", 0Dh, 0Ah, 0Dh, 0Ah,0 124 000000E6 0A00 125 edid_row: 126 000000E8 20 db 20h 127 edid_row_chars: 128 000000E9 303068203030682030- db "00h 00h 00h 00h 00h 00h 00h 00h " 128 000000F2 306820303068203030- 128 000000FB 682030306820303068- 128 00000104 2030306820 129 00000109 303068203030682030- db "00h 00h 00h 00h 00h 00h 00h 00h " 129 00000112 306820303068203030- 129 0000011B 682030306820303068- 129 00000124 2030306820 130 00000129 0D0A00 db 0Dh, 0Ah, 0 131 132 edid_rerr_msg: 133 0000012C 454449442072656164- db "EDID read error !" 133 00000135 206572726F722021 134 0000013D 0D0A db 0Dh, 0Ah 135 0000013F 284544494420697320- db "(EDID is not ready or Video Bios function error!)" 135 00000148 6E6F74207265616479- 135 00000151 206F7220566964656F- 135 0000015A 2042696F732066756E- 135 00000163 6374696F6E20657272- 135 0000016C 6F722129 136 00000170 0D0A00 db 0Dh, 0Ah, 0 137 138 ;============================================================================= 139 ; uninitialized data 140 ;============================================================================= 141 142 bss_start: 143 144 ABSOLUTE bss_start 145 146 00000173 alignb 2 147 148 buffer: 149 150 edid_buffer: 151 152 00000174 resb 128 153 154 bss_clear_end: 155 156 bss_end: