94 lines
2.6 KiB
Plaintext
94 lines
2.6 KiB
Plaintext
MX 86000 512K, 800x600x256c/1024x768x16c
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MX 86010 1MB, 1024x768x256colors
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Support chips:
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MX8602 Clock chip. Supplies 25.175, 28.322, 40,44.9, 14.3, 16.3, 36, 65 MHz
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3C4h index 26h (R/W):
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bit 0 Set for MX86000, clear for MX86010
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3C4h index 30h-33h (R/W): Scratch
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Note: used by MXIC utilities to store the old IRQ 2 interrupt address.
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3C4h index 34h (R/W):
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bit 0-1 Monitor type: 0=VGA, 1=8514A, 2=NEC 3D, 3=NEC 4D
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3C4h index 65h (R/W):
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bit 6 Set to enable access to extended registers (3C4h index 8-FFh).
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3C4h index 90h (R/W):
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bit 0-1 ??
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3C4h index A7h (W?): Enable extensions
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bit 0-7 Writing 87h to this register enables the MXIC extensions,
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writing 0 disables them.
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3C4h index C2h (R/W):
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bit 2-3 Video RAM installed: 0=256k, 1=512k, 2=1M
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3C4h index C3h (R/W):
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bit 2 Set to enable banked access via index C5h.
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3 If set doubles image horizontally
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7 Bus width?. 0=8 bit, 1=16 bit.
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3C4h index C4h (R/W):
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bit 0 Clock Select bit 2 (bits 0-1 are in 3C2h/3CCh bits 2-3)
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3 Select Memory Clock for Video Clock ?
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6,7 Disables display if set
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3C4h index C5h (R/W): Bank register
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bit 0-3 Write bank in 64k blocks.
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4-7 Read bank in 64k blocks
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3C4h index F0h (R/W):
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bit 0-1 3 if interlaced, 0 if not.
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3 If clear the display will wrap at 256K.
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4 If set display width or scanline width is slightly wrong ?
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7 Disables display if set
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3C4h index F1h (R/W):
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bit 0-1 Display Start Address bit 16-17
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3C4h index F2h (R/W):
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bit 7 Set if IRQ2 enabled, clear if not.
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3C4h index F3h (R/W):
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bit 0 Scrambles display if set ?
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1 Vertical overflow ?
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2 Disables display if set
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3 If set the same (random ?) line is repeated down the entire screen
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5 Disables display if set
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6 If set the same (random ?) line is repeated down the entire screen
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7 If set image looses vertical sync ??
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Apparently the sequencer (3C4/5h) does not decode bit 3-4 of the index, thus
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index 7 is duplicated at 0Fh, 17h and 1Fh.
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Test for MXIC chip:
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old:=rdinx($3C4,$A7);
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wrinx($3C4,$A7,0); {Disable extensions}
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if not testinx($3C4,$C5) then
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begin
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wrinx($3C4,$A7,$87);
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if testinx($3C4,$C5) then
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if (rdinx($3C4,$26) and 1)=0 then MXIC MX86010
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else MXIC MX86000
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end;
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wrinx($3C4,$A7,old);
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Video modes:
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50h T 132 25 16 (8x16)
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51h T 132 30 16 (8x16)
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55h G 800 600 16 PL4
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56h G 1024 768 16 PL4
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57h G 640 350 256 P8
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58h G 640 400 256 P8
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59h G 640 480 256 P8
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5Ah G 800 600 256 P8
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5Bh G 1024 768 256 P8
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