INS1771-1 Datasheet | National Semiconductor

~National ~ Semiconductor SEPTEMBER 1978 Pub. No. 426305468'()Ol INS1771-1 Floppy Disk Formatter/Controller General Description The INS1771-1 is a programmable floppy disk formatter/ controller chip contained in a standard 40'pin dual-in- line package. The chip. which is fabricated using N-channel silicon gate technology. interfaces a floppy disk drive directly to a puter interface bus. The I NS1771-1 provides soft sector formatting. which may be either IBM 3740 patible or a user-selected sector format. The INS1771-1 is designed to operate on a multiplexed. TR I-STA TE® S-bit bidirectional bus with other busoriented devices. The c!1ip is programmed by the system software via the...