I have a green phosporous emulator for CGA only. Never tried it.

thx - i try this - maybe it is the excatly this thing i want

I remember I wrote a small ASM program that make VGA use monochrome palette only.

Here is an excerpt from Ralph's Brown doc.

INT 10 - VIDEO - PERFORM GRAY-SCALE SUMMING (VGA/MCGA) AX = 101Bh BX = starting palette register CX = number of registers to […]
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INT 10 - VIDEO - PERFORM GRAY-SCALE SUMMING (VGA/MCGA)
AX = 101Bh
BX = starting palette register
CX = number of registers to convert
Return: nothing
Desc: convert the RGB values of one or more palette registers such that the
resulting values are grays with the same intensities as the original
colors
SeeAlso: AH=12h/BL=33h

Well, I made a 12 byte .COM using debug but it does just nothing. Then again, I don't know how many registers I have to change.

the Verde prog works - i can run the program, and the screen changes the
res. and the palette to full green - but when i run the PQ1 game, the
colors come back - i think in this case windows "makes the difference".
(PS: not to be misunderstood : i first start the command line "cmd" - tzhen the verde prog, and then - in the same command line - the game)

So i have to look for a windows Program that emulates the grayscale for
applications, and that stays resident in the windows background- but i
dont think i can find such a program 😖
this could be a cool addon for the next DOS-BOX ver. 😉

I try to see this positive : i still can play my "g"old games 😀

ps:

thxfor the source-code but i dont have any compiler to make a .com file and
im not a programmer - all i can is a bit C and turbo pascal 😁

Doh! Forgot to attach the file. It seems it doesn't work anyway. It's maybe for real ms-dos.

The verde prog works within dosbox really well, when i change the machine settings to hercules - then i can start it and have full greeen screen output. But i cannot change the settings to grey palette - even if the mode seems to be changed to Monochrome-mode, as u can see in the pic.

Does it MEAN that the Monochrome mode is Activated ??? Cause i cannot read Spanish 😒

I keep searching; maybe i will find such a Emulator in the "endless universe of the internet". Once i find it i will post some an answer in the forum (in case other ones are such crazy people like me 😁 )

But Really thx for help el_PuSHeR

VERDE is Spanish for "green" and that's exactly what verde does. It emulates CGA monochrome but using shades of green ONLY.

PS - I will translate docs into English if I feel brave enough. 😁

Here's an exerpt from docs.

VERDE is a program that tries to emulate visual appearance of old green phosporous displays under VGA ones. Something that may sound stupid at first sight, has its own foundation. In fact, newer display hardware, with its high definition, are a very bad support for the primitive CGA card graphic modes. These modes, emulated nowadays by VGA cards, appear to be totally different from the thought we had those of us who played on a real CGA monitor. Due to this reason, somes games that appeared great in the 80's (keeping in mind CGA's big limitations), appear now somewhat disvirtued. Some of us have experienced that dissapointing feeling after downloading with great hope some classic PC game and finding out that it appears to be something totally different as we recalled it (without counting speed factor).

did it in some strange way: i use the ATI Omega drivers - there i can turn a Smart-Shader option on, and change the dosbox settings to opengl -> then i get grayscale-Screen in the dosbox

Now i need a new Notebook - with a Ati card 😁 cause i only have an sis graphics on board 😐