06201: cpcp464p, cpc6128p, gx4000: Monochrome monitor is not monochrome

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
06201	Graphics	Minor	Always	May 4, 2016, 10:23	May 5, 2016, 08:12

Tester	nls	View Status	Public	Platform	MESS (Official Binary)
Assigned To		Resolution	Open	OS	Windows Vista/7/8 (64-bit)
Status [?]	Confirmed			Driver	amstrad/amstrad.cpp
Version	0.173	Fixed in Version		Build	Normal
		Fixed in Git Commit		Github Pull Request #

Summary	06201: cpcp464p, cpc6128p, gx4000: Monochrome monitor is not monochrome
Description	In current implementation of this driver, setting the monitor to monochrome (which was normal factory option for these), actually just changes background to light green, while KEEPING all the colors enabled!
Steps To Reproduce	Set monitor to monochrome in system configuration, run a game (like Amstrad stock, Burn Rubber). Background remains a (fake) green (no monochrome monitor produced this green) and all other game colors show normally (red, blue etc.).
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	cpcp464p, cpc6128p, gx4000

Attached Files

No.12596 Tafoid Administrator May 5, 2016, 00:31	Get me some example pictures and comparisons? There was recent discussion regarding it here: http://forums.bannister.org/ubbthreads.php?ubb=showflat&Number=104495#Post1044495
No.12603 nls Tester May 5, 2016, 08:12 edited on: May 5, 2016, 08:12	What kind of example pictures? I don't have a real green monitor (or a CPC for that matter). I am not sure of the proper way to make it work (it could be just stripping R and B signals, it could be retaining luma and stripping chrominance. Don't know. NOTE that CPC464 and CPC6128 (non-plus) models work properly in green mode. In other words this BASIC program (sorry never owned an Amstrad CPC): 10 MODE 0:PAPER 0:PEN 1 20 FOR i=0 TO 26 30 INK 0,i 40 LOCATE 10,12:PRINT"INK";i 50 FOR t=1 TO 400:NEXT t,i 60 MODE 1:INK 0,1:INK 1,24:CLS ...will produce green hues in CPC464/6128/664 with set monitor green, but will still produce colors in CPC464+/6128+/GX4000.

No.12596

Tafoid

Administrator

May 5, 2016, 00:31

Get me some example pictures and comparisons?
There was recent discussion regarding it here:
http://forums.bannister.org/ubbthreads.php?ubb=showflat&Number=104495#Post1044495

No.12603

nls

Tester

May 5, 2016, 08:12

edited on: May 5, 2016, 08:12

What kind of example pictures? I don't have a real green monitor (or a CPC for that matter).

I am not sure of the proper way to make it work (it could be just stripping R and B signals, it could be retaining luma and stripping chrominance. Don't know.
NOTE that CPC464 and CPC6128 (non-plus) models work properly in green mode.

In other words this BASIC program (sorry never owned an Amstrad CPC):

10 MODE 0:PAPER 0:PEN 1
20 FOR i=0 TO 26
30 INK 0,i
40 LOCATE 10,12:PRINT"INK";i
50 FOR t=1 TO 400:NEXT t,i
60 MODE 1:INK 0,1:INK 1,24:CLS

...will produce green hues in CPC464/6128/664 with set monitor green, but will still produce colors in CPC464+/6128+/GX4000.