Realtek RT 3106 - Upto 1 Mbyte. RTG3105 100pin RTG3106 3CEh index 0Ah (R/W): 3CEh index 0Bh (R/W): bit 0-1 Divide the Video Dot Clock by: 0: 1, 1: 1.5, 2: 2, 3: 4 3CEh index 0Ch (R/W): bit 2 Always set ?? 4 If set doubles the number of pixels in a "character clock" Pixels per character clock: clear set 16color modes 8 16 256color modes 4 8 Also there are two clock pulses per pixel. 5 Clock Select bit 2. Bits 0-1 are in 3C2h/3CCh bits 2-3. 6 ?? 3CEh index 0Fh (R/W): Extended Function. bit 2 Single/Dual bank. If set 3D6h is the read bank number and 3D7h is the write bank number, if clear 3D7h is used for both read and write operations. 3d4h index 19h (R/W): bit 0 Interlace enabled if set. If set the display offset in 3d4h index 13h is the number for two scanlines, rather than one. 1 Enable memory beyond 64K (256colors) 4 Display Start Address bit 16. 5 Enables display to cross 256K boundary if set 6 Display Start Address bit 17. 7 Enables display to cross 512K boundary if set 3d4h index 1Ah: bit 6-7 Chip version. 0 = Version 0 (RTG3103 ?) 1 = Version 1 (RTG31030?/RTG3105) 2 = Version 2 (RTG3106) 3 = Version x ?? 3d4h index 1Eh: bit 0-1 Video Ram. If Chip version =0: 0=256k, 1=512k, 2=768k and 3=1MB If chip version >0: 0=256k, 1=512k, 2=1MB and 3=2MB. 2 4-6 7 Must be set to access the extended CRTC registers ???? 3D4h index 1Fh (R/W): bit 0-1 Emulation mode: 0=VGA, 1=EGA, 2=CGA, 3=MDA 2-5 3D6h (R/W): Bank register bit 0-3 64k Bank register (Read bank if 3CEh index Fh bit 2 set) 3D7h (R/W): Bank Register bit 0-3 64k bank number. (Write/single bank) Test for Realtek Chip: if testinx2(base,$1F,$3F) and tstrg($3D6,$F) and tstrg($3D7,$F) then case rdinx(base,$1A) shr 6 of 0:Realtek RT3103 1:Realtek RT3105 2:Realtek RT3106 end; Video modes: 18h T 80 30 16 (9x16) 19h T 80 43 16 (9x11) 1Ah T 80 60 16 (9x8) 1Bh T 132 25 16 (9x14) 1Ch T 132 30 16 (9x16) 1Dh T 132 43 16 (9x11) 1Eh T 132 60 16 (9x8) 1Fh G 800 600 16 PL4 20h G 960 720 16 PL4 21h G 1024 768 16 PL4 22h G 768 1024 16 PL4 23h G 1024 768 4 PL2 24h G 512 512 256 P8 25h G 640 400 256 P8 26h G 640 480 256 P8 27h G 800 600 256 P8 28h G 1024 768 256 P8 29h G 1024 1024 256 P8 2Ah G 1280 1024 16 PL4 38h G 320 200 64K P16 39h G 512 512 64K P16 3Ah G 640 400 64K P16 3Bh G 640 480 64K P16 3Ch G 800 600 64K P16 ----------105F00------------------ INT 10 - VIDEO - Realtek VGA - RETURN CHIP VERSION AX = 5F00h Return: AH = 00h if successful AL = Chip version 00h RTG3103 ? 01h RTG31030/RTG3105 02h RTG3106 ? 3Fh Not a Realtek chip ----------105F01------------------ INT 10 - VIDEO - Realtek VGA - GET RTVGA BIOS STRING AX = 5F01h ES:DI -> buffer to receive BIOS ID string Return: AL = 00h if successful ES:DI -> buffer with zero terminated BIOS ID string ----------105F02------------------ INT 10 - VIDEO - Realtek VGA - GET VIDEO MEMORY SIZE AX = 5F02h Return: AH = 00h if successful AL = Memory size. 0: 256K, 1: 512K, 2: 768K, 3: 1024K ----------105F03------------------ INT 10 - VIDEO - Realtek VGA - SET ?? AX = 5F03h BL = 0-3 ?? Return: AH = 00h if successful