Floppy Disk Controller - UMC
Description
(l)UMC
UM8272A / UM8272A'-4
: : : : : : : : : : : : : Floppy Disk Controller
Features
• IBM Compatible in Both Single and Double Density Recording Formats
• Programmable Data Record Lengths: 128, 256, 512, or 1024 Bytes/Sector
• Multi-Sector and Multi-Track Transfer Capability • Drives Up to 4 Floppy or Mini-Floppy Disks • Data Transfers in DMA or Non-DMA Mode
• Parallel Seek Operations on Up to Four Drives • Compatible with all intel and Most Other Mlcropro-
cessors • SIngle-Phase 8MHz/4MHz Clock for UM8272A/
UM8272A-4 respectively • Single + 5 Volt Power Supply (± 1COAl)
General Description
The UM8272A is an LSI Floppy DIsk Controller (FDC) Chip, which contains the circuitry and control functions for interfacing a processor to 4 Floppy Disk Drives, It is
capable of supporting either IBM 3740 single density
format (F rvi), or IBM System 34 Double Density fo rmat
(MFM) including double sided recording, The UM8272A
Pin Configuration
Block Diagram
RESET RD
W...
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