downleveln.adj.
/ˌdaʊnˈlɛvl/, U.S. /ˈdaʊnˌlɛv(ə)l/ A. n.
Electronics and Computing. In certain methods of implementing logic in circuit boards: a voltage level at which a signal represents ‘0’. Now rare.
ΚΠ
1957 Proc. Eastern Joint Computer Conf. 1956 66/1 If one or more inputs to either A or B or C are at their down level, these transistors will conduct the current I.
1974 G. G. Langdon Logic Design i. 36 The actual ‘down-level’ (logical 0) of a circuit..is influenced mainly by a ‘voltage divider’ effect.
B. adj.
1. Electronics and Computing. In certain methods of implementing logic in circuit boards: designating a voltage that represents ‘0’; (also) of or relating to such a signal. Now rare.
ΚΠ
1968 IBM Jrnl. Res. & Devel. 12 290/1 (table) Dc Supply Monitors... Means for monitoring fixture dc voltages or up and down level voltages.
1972 IEEE Jrnl. Solid-state Circuits 7 246/1 It is also important to examine the impact of device fabrication tolerances on the down-level output signal.
2. Computing. Designating a program or piece of software whose version is older than the most current. In later use sometimes also: designating an internet browser which is incompatible with certain features of dynamic web pages and applications.
ΚΠ
1987 Yet More A1000->A2000 Upgrade Questions in comp.sys.amiga (Usenet newsgroup) 2 Oct. The retailers have no real insentive [sic] to ask the software houses to upgrade their down level programs.
2002 S. Mitchell et al. ASP.NET iv. 165 For downlevel browsers, HTML 3.2 is rendered without client-side JavaScript support.
2016 E. Diehl Ten Laws for Security Appendix B 234 Downlevel software is vulnerable.
This entry has been updated (OED Third Edition, December 2018; most recently modified version published online March 2022).
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n.adj.1957