Function of the card:
Tdl and trl load card
TDL & TRL Load Card
Tdl & trl load card
1.6k resistor
Listed in 1401 SMS card usage
Part number: 370232
Customer Eng reference number: 729909
PCB number: 492345 , hole pattern: 493457
Used in: IBM 1410, IBM 1311 Disk, IBM 1401, IBM 1443 Printer, IBM 1414 I/O Synchronizer, IBM 2821 Control Unit
Cap code: None (details)
Symbol: R
R: Load. Provides proper terminating impedance or optimum coupling of one circuit to another at the correct operating voltage level.
References: IBM 1311 ILD, p115
IBM 2821 CCD, p42
IBM 1443 ALD, p91
1410_SMS_VOL_1.pdf, p49
2_2 SMS Cards, pp76,77
Coslet data
The information on these pages comes from a variety of sources, especially old IBM documents on bitsavers.org, as well as information from the IBM 1401 restoration team, especially Tim Coslet's SMS data and Jim Hunt's data. Much of this information was obtained through OCR, so don't expect complete accuracy. These pages are not associated with IBM in any way.