Replacement for a DEC 7474 Chip

Eric Smith spacewar at
Tue May 17 10:47:55 CDT 2022

On Tue, May 17, 2022 at 12:35 AM ben via cctalk <cctalk at>

> Did DEC not use a few Non TTL chips to reduce I/O loading on the bufferd
> lines?

DEC used non-TTL buffer chips for bus interface (Omnibus, Unibus, Qbus, and
external buses like Massbus). Most of the other SSI/MSI logic chips are TTL
or TTL-compatible. TTL buffers were usually used where higher fanout was
needed on a module, or on non-bus backplane connections.

More information about the cctalk mailing list