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║ DATA TECHNOLOGY CORP. DTC-7280 ║
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║ J5 J4 J3 J2 J1 ║
║ ┌──────────────────────────────────────────────────────┐╔═══ ║
║ │ .... 1: 1: 1: 1: W4 │║ ║
║ │ :: :: :: :: :: │║ ║
║ │ :: :: :: :: W7 │║ ║
║ │ .. :: :: │║ ║
║ │ W6 :: :: W5:::W2 │║ ║
║ │ | │║ ║
║ │ W3 │║ ║
║ └─────────────────────────────┐ ┌┐ ┌──┘║ ║
║ └───────┘└────────────┘ ║ ║
║ INTERFACE: ISA(AT)->ST412(RLL) ║
║ CONTROLS: 2 Floppy drives (360K, 720K, 1.2M, 1.44M) ║
║ 2 Hard Drives ║
║ ║
║ W2,W3: Port Address Selection ║
║ *1F0-1F7, 3F0-3F7 (Primary Address): (no Jumpers) ║
║ 170-177, 370-377 (Secondary Address: W2, W3 Jumpered ║
║ ║
║ W4: Floppy Drive Transfer Rate J1: Floppy ║
║ 250KHz: W4 Jumpered J2: HD Control ║
║ *500KHz: (no Jumper) J3: HD0 Data ║
║ J4: HD1 Data ║
║ W5: Drive Select Mode Type J5: LED ║
║ *Hardware Select Mode: W5 Jumpered ║
║ Firmware Select Mode: (no Jumper) ║
║ ║
║ W6: Auto-Deselect Mode ║
║ *Auto-Deselect Mode Enabled: W6 Jumpered ║
║ Auto-Deselect Mode Disabled: (no Jumper) ║
║ ║
║ W7: Floppy Precompensation Selection ║
║ Precompensation at 125nSec: W7 Jumpered ║
║ *Precompensation Scaled/Freq: (no Jumper)...(125nS@500KHz, ║
║ 208nS@300KHz, ║
║ * Default Settings 250nS@250KHz.) ║
║ ║
╟────────────────────────┐ ADDITIONAL INFO ┌────────────────────────────╢
║ ║
║ The DTC7280 is a 1:1 interleave RLL controller. It will run at zero ║
║ wait states up to a bus speed of 16MHz. The 7280 does not have an ║
║ embedded Low Level Format routine, and requires The IBM AT Advanced ║
║ Diagnostics, or similar 3rd party program for Low Level Formatting. ║
║ The 7280 is OS/2 compatible. ║
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