rxvt 1:2.7.10-7 (s390x binary) in ubuntu bionic

 Rxvt is an 8-bit clean, color xterm replacement that uses significantly
 less memory than a conventional xterm, mostly since it doesn't support
 toolkit configurability or Tek graphics, but also since features can
 be removed at compile-time to reflect your needs.
 .
 The distribution also includes rclock, the smaller/better xclock
 replacement with appointment scheduling and xbiff functionality.