IBM 1400 Series - Compatible Systems

Compatible Systems

IBM provided several models compatible (or nearly so) with the 1401.

• 1460 was twice as fast, and many special features of 1401 were standard.
• 1440 was a popular lower-cost alternative, although not fully compatible with the 1401.
• 1240, 1420, 1450 were systems specially designed for banking.
• 1410 was a much faster system in the same spirit as 1401, but with significant differences, such as larger memory (up to 100,000 characters), more index registers (fifteen), five digit addresses, and additional instructions. A remarkable feature in the pre-microprogramming era was a "compatibility mode" switch that allowed it to run 1401 programs without change.
• 7010 was a faster and exactly compatible version of 1410.
• The IBM System/360 Model 30 could be ordered with a 1401 compatibility microprogram feature. Several 1400 series peripherals were adapted for use with System/360.

Honeywell's Honeywell 200 provided approximate 1401 compatibility through a combination of architectural similarity and software support.