The Packard Bell PB-250 is a 22-bit minicomputer from 1961 that uses delay-line loops as main memory.

Manufacturer Packard Bell Computer
Model PB 250
Classification Minicomputer
Introduced 1961
Word Size 22 bits
Implementation Bit-serial, Discrete germanium transistors
Registers 3
Logical Address 3,572 locations
Physical Address 15,888 locations
Memory Type Magnetostrictive acoustic delay-line