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- Hualon Microelectronics Corporation
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- HM86304 512K
- HM86314 Upto 1MB
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- Support chips:
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- HM8694P-304 Clock chip
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- 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 ?
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- 3C4h index E8h (R/W):
- bit 0-7 ??
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- 3C4h index EDh (R/W):
- bit 0 Display Start Address bit 16.
- 1-7 ??
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- 3C4h index EEh (R/W):
- bit 0-3 ??
- 4-6 64k bank number
- 7 ??
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- 3C4h index EFh (R/W):
- bit 0-4 ??
- 5 Sync ??
- 6-7 ??
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- The Hualon chip appears to use 3C4h index E0h-EFh.
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- ID Hualon chip set:
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- if testrg($3C4,$E7) and testrg($3C4,$EE) then
- begin
- Hualon HM86304
- end;
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- 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
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