08542: spec128, specpl3e: Some spectrum models are running at wrong speed

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08542	Timing	Minor	Always	Jan 1, 2023, 22:09	Jun 21, 2023, 13:52

Tester	StHiryu	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	No change required	OS	Windows Vista/7/8 (64-bit)
Status [?]	Closed			Driver	sinclair/spec128.cpp
Version	0.251	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08542: spec128, specpl3e: Some spectrum models are running at wrong speed
Description	Some spectrum models (Zx Spectrum 128 and Zx Spectrum +3) are running a little bit faster (50.021154 Hz) than they should, according to this link: https://worldofspectrum.org/faq/reference/128kreference.htm "Note that this means that there are 70908 T states per frame, and the '50 Hz' interrupt occurs at 50.01 Hz, as compared with 50.08 Hz on the 48K machine."
Steps To Reproduce	Launch one of those spectrum models: -spec128 -specpl3e
Additional Information
Github Commit

Flags
Regression Version	0.244
Affected Sets / Systems	spec128, specpl3e

Attached Files

No.21570 holub Tester Jun 19, 2023, 14:55 edited on: Jun 19, 2023, 16:34	I'm not sure how to match this numbers because 3546900/70908 gives you 50.02, not 50.01
No.21571 holub Tester Jun 19, 2023, 16:34	We discussed this with folks on Spectrum channal and came to conclusion WOS has a typo here.
No.21572 StHiryu Tester Jun 20, 2023, 01:08	So 50.02 is the correct value?
No.21573 holub Tester Jun 20, 2023, 05:50	50.021154 - yes
No.21574 StHiryu Tester Jun 20, 2023, 08:10	Cool, thanks for watching at this.
No.21575 Robbbert Moderator Jun 21, 2023, 05:35	So, does this mean there's no issue and it can be closed?
No.21576 holub Tester Jun 21, 2023, 08:27	Can be closed. Mame's value is precise