Timing Test

Author: Rak, Patrik
License: GPL

Version	Release date	Links	Download
v0.3	2013-12-09	Forum post	zip (hosted) - zip (original URL)
v0.2	2007-09-25	Forum post 1, Forum post 2	zip (hosted) - zip (original URL)

Description

Expected results

v0.3

ZX Spectrum 48K
Frame duration	0: contended NOP
1: snow effect NOP	2: IN #00FE IO
Snow OFF
3: IN #00FF IO	4: IN #7FFE IO
5: IN #7FFF IO	6: IN #FFFE IO
7: IN #FFFF IO	8: 128k page RET
ZX Spectrum + 128K / +2 (any mode)
Frame duration	0: contended NOP
1: snow effect NOP	2: IN #00FE IO
3: IN #00FF IO	4: IN #7FFE IO
5: IN #7FFF IO	6: IN #FFFE IO
7: IN #FFFF IO	8: 128k page RET
ZX Spectrum +2A / +2B / +3 / +3B (any mode)
Frame duration	0: contended NOP
1: snow effect NOP	2: IN #00FE IO
3: IN #00FF IO	4: IN #7FFE IO
5: IN #7FFF IO	6: IN #FFFE IO
7: IN #FFFF IO	8: 128k page RET

v0.2

ZX Spectrum 48K
Frame duration	0: contended NOP
1: snow effect NOP	2: IN #00FE IO
Snow OFF
3: IN #00FF IO	4: IN #7FFE IO
5: IN #7FFF IO	6: IN #FFFE IO
7: IN #FFFF IO	8: 128k page RET

Results on real hardware

v0.3: ZX Spectrum +2 (ES)

[Tested by Víctor Iborra]

48K mode
Frame duration	0: contended NOP
1: snow effect NOP	2: IN #00FE IO
3: IN #00FF IO	4: IN #7FFE IO
5: IN #7FFF IO	6: IN #FFFE IO
7: IN #FFFF IO	8: 128k page RET

v0.3: ZX Spectrum +3

Tested by ZXGuesser

48K mode
Frame duration	0: contended NOP
1: snow effect NOP	2: IN #00FE IO
3: IN #00FF IO	4: IN #7FFE IO
5: IN #7FFF IO	6: IN #FFFE IO
7: IN #FFFF IO	8: 128k page RET