Build an RS-232C code-activated switch that will let you switch between several peripherals connected to one serial port.
BYTE May 1983 (v.8#5) pg. 49
Added Info BYTE Sep 1984 (v.9#10) pg. 48
Serial bus switch for the Commodore-64 lets you feed two different computers to a single peripheral. Est. cost: $10.
ELECTRONICS HOBBYISTS HANDBOOK 1989 pg. 85
Serial bus switch for the Commodore-64 computer. Flip a switch to output one of two different serial ports to the same peripheral. Uses a six-pole, double-throw switch to transfer six lines.
HANDS-ON ELECTRONICS May 1987 (v.4#5) pg. 75
Computer-controlled A/B switch makes it easy to switch any pair of AC or DC signals, including RS-232 signals. Est. cost: $35 (kit).
POPULAR ELECTRONICS [2] Oct 1993 (v.10#10) pg. 43
Add a switch to your serial computer port to switch between two devices which each require the same interrupt.
POPULAR ELECTRONICS [2] May 1995 (v.12#5) pg. 60
RS-232 switcher. Allow two or more serial devices to be connected to one RS-232 port, but only one at a time. Change devices by flipping a switch.
SCIENCE & ELECTRONICS [2] May-Jun 1981 (v.21#3) pg. 47