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HUALON.TXT
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1995-09-29
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1KB
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64 lines
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