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Computer hardware/VGA documents/HUALON.TXT

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+Hualon Microelectronics Corporation
+
+HM86304    512K
+HM86314    Upto 1MB
+
+
+Support chips:
+
+HM8694P-304  Clock chip
+
+
+3C4h index E7h (R/W):
+bit   0  Set in interlaced modes
+      1  Set in 256c enhanced modes.
+      2  In planar modes enables access (both display and read/write) to the
+         second bank at $B000 (upper 256K).
+    3,5  ??
+      4  Set if 512K, clear if 256K
+      6  Clock Select bit 2. Bits 0-1 are in 3CCh bits 2-3.
+         Clocks:  0: 25,175, 1: 28.322, 2: 32.5, 3: 36,
+                  4: 40, 5: 44.9, 6: 80 7: 65MHz
+      7  Clock Select ?
+
+3C4h index E8h (R/W):
+bit 0-7  ??
+
+3C4h index EDh (R/W):
+bit   0  Display Start Address bit 16.
+    1-7  ??
+
+3C4h index EEh (R/W):
+bit 0-3  ??
+    4-6  64k bank number
+      7  ??
+
+3C4h index EFh (R/W):
+bit 0-4  ??
+      5  Sync ??
+    6-7  ??
+
+The Hualon chip appears to use 3C4h index E0h-EFh.
+
+
+ID Hualon chip set:
+
+if testrg($3C4,$E7) and testrg($3C4,$EE) then
+begin
+  Hualon HM86304
+end;
+
+Video Modes:
+20h  T   132   25   16  (8x16)
+21h  T   132   44   16  (8x8)
+22h  T   132   25   16  (8x14)
+28h  G   800  600   16  PL4
+29h  G  1024  768   16  PL4   . Interlaced
+2Ah  G  1024  768   16  PL4   . Non-interlaced
+2Bh  G   640  200  256  P
+2Ch  G   640  400  256  P8
+2Dh  G   640  480  256  P8
+2Eh  G   800  600  256  P8    . (832 bytes per scanline)
+31h  G  1024  768    4  PL2     Interlaced
+32h  G  1024  768    4  PL2   . Non-interlaced