Karoshi MSX Community

after the successful (imho) approach i got on msx2+ display modes, i'm now trying to implement v9990 libraries on Boriel's ZX-Basic Compiler, but i'm struggling on:

1- run by Bash script (command line, Linux) OpenMSX with v9990 (gfx9000 or video9000) enabled
2- check if i were using the exact v9990 ports, if some reset/initialization is needed, etc.
3- some snippets in assembly z80 that might be useful on the development

for now, i think the most essential is to be able to set the screen mode, palette, vpeek, vpoke, etc., and i think everything later is a bit easier

files are at https://drive.google.com/#folders/0B7Iw8X7IB4-nQkZFNmxXN2pxNkU - thanks!

Hi.

1. openmsx -ext gfx9000 romname.rom

2. You have all that information in the teambomba's g9klib, and searching v9990 in the internet: v9990 e-vdp-iii.
      Normally you will use ports 0x60-0x67

3. At first I recommend using openMSX-debugger for testing. You can write directly on the registers and go see how it behaves, and then fret the VRAM. When you are clear about how it works, start typing code.


vpoke:
;writes B value at DHL address
     di
     xor a
     out[0x64],a   ;register 0 selected

     ld a,l
     out [0x63],a  ;this will write L value to register 0. (Low byte)
     ld a,h
     out [0x63],a  ;this will write H value to register 1. (Med byte)
     ld a,d
     out [0x63],a  ;this will write D value to register 2. (High Byte)

     ;VRAM pointer points to DHL
     ld a,b
     out [0x60],a 
     ei
     ret
     

in theory, this is what i have at http://nitrofurano.altervista.org/retrocoding/msx/ (those v9990 examples in the attachment, that i think none of them work) - and btw, if someone could post a small assembly snippet (compilable on asmsx would be awesome! ;) ) that can make use of that, and i could try opening the resulting .rom file on OpenMSX, would be amazing

i'm trying this now:


nothing happens, just a blank display when i enter "set videosource gfx9000" on the OpenMSX console

btw, how can i replace "set videosource gfx9000" with a command line, so i don’t need to go to the console for entering that console command?

In the console, type: F6 will swap between V9990 output and Standard VDP output.

it’s working! thanks! :)
and thanks a lot for the OpenMSX command for display switching, i didn’t know that! :)

and about the "not necessary", they actually were in my case, i was trying to create libraries for ZX-Basic:

example08.bas

library/msxgfx9kvdp.bas:

library/msxgfx9kpalette.bas:

library/msxgfx9kvpoke.bas:

another question: from http://msxbanzai.tni.nl/v9990/manual.html , related to the display modes, i don’t know how with MCS and P#7 are accessed, like at "register setting values for each display mode", the difference between modes b0 and b1, b2 and b3, b4 and b7 - how can we access these modes b0, b2 and b4?

nevermind, i found that, it is "out $67,1"

at https://docs.google.com/file/d/0B7Iw8X7IB4-nMWpSYTEtR3hYRDQ i have a bunch of initial tests trying to cover all display modes summarily (i still didn't tried all combinations of laced, pal/ntsc, etc.), soon i hope having better ideas of examples using them -- (btw, the sources are there, if someone might want to start something)

You should use the autoinc register feature, maybe creating another function:

thanks! :)