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║ Western Digital, Inc. WD1003-MM1,2 ║
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║ ║
║ J6 J3 J4 J5 J1(MM2) ║
║ J1: Floppy ┌─────────────────────────────────────────┐╔═══ ║
║ J3: HD1 Data │.... 1:::: 1:::: 1:::::: 1:::::: │║ ║
║ J4: HD0 Data │ │║ ║
║ J5: HD Control │ W1 :::: .. W3 │║ ║
║ J6: HD LED │ .. W4 │║ ║
║ │ .. W5 │║ ║
║ │ │║ ║
║ │ W6 : │║ ║
║ └────────────────┐ ┌┐ ┌──┘║ ║
║ └───────┘└────────────┘ ║ ║
║ INTERFACE: ISA(AT)->ST506/412(MFM) ║
║ CONTROLS: 2 Floppy Drives (MM2 only; 360KB, 720KB, 1.2MB, 1.44MB) ║
║ ║
║ W1: 1-2: Hard Drive Mode: OFF: Latched Mode ║
║ *ON: Non-Latched Mode ║
║ ║
║ 3-4: Error Correction Code (ECC), 4-byte: *OFF: Enabled ║
║ ON: (Reserved) ║
║ ║
║ 5-6: Caching: *OFF: Caching Enabled ║
║ ON: Caching Disabled ║
║ ║
║ 7-8: WD1003-WA2,WAH Compatibility for OFF: Incompatible ║
║ Drives with 8 or more heads: ON: Compatible ║
║ ║
║ W3: Hard Drive I/O Address: *OFF: Primary address ║
║ ON: Secondary address ║
║ ║
║ W4: Floppy Drive I/O Address: *OFF: Primary address ║
║ ON: Secondary address ║
║ ║
║ W5: Floppy Speed Support: OFF: Single Speed Drives only ║
║ ON: Dual Speed Drives only ║
║ ║
║ W6: Bracket Grounding Option: *OFF: Bracket not grounded ║
║ ON: Bracket grounded ║
║ ║
╟────────────────────────┐ Additional Info ┌────────────────────────────╢
║ ║
║ W1:7-8 Addresses a disparity between the MMx series and the WA2/ ║
║ WAH series concerning heads #8-15. When replacing a WA2/WAH series ║
║ with an MMx series on drives with over 8 physical heads, this jumper ║
║ is required to maintain compatibliity. ║
║ There is no Low Level Formatting routine contained on this card. ║
║ A third-party LLF software program is required, ie; The IBM AT ║
║ Advanced Diagnostics, KOLOD Research Utilities, or Western Digital ║
║ AT Low Level Formatter (found on WD's BBS). ║
║ Do NOT mix single-speed and Dual-speed Floppy drives on the same ║
║ controller. ║
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