ZX Spectrum Timing Tests 48K

Author: Butler, Richard; Butler, Tim
Release date: 2010-04-06, 2010-04-14
Links: Announcement, Website, Download page
Download: sna, tap, tzx, wav _^(hosted) - sna, tap, tzx, wav _{^{(original URL)}}

Expected results

Early timings	Late timings

Results on real hardware

ZX Spectrum 48K (Issue 6A, CPU SGS Z8400AB1, ULA 6C001E-7) - cold / late timings

Tested by Matthew London

• Test 1, Late timings: The machine was put under an air conditioning vent to cool it before setting it up.

  https://www.youtube.com/watch?v=--_PfyDDLkE

• Test 2, Late/early timings: The machine was cold and started with late timings, but went early timings during the execution of the test.

  https://www.youtube.com/watch?v=N2XQTE18w48