active minimig coder

[AJCopland]

boing4000 wrote:

(WTF is my HRM?)

is my - all alien to me.

In this case:
WTF = Where The F*k (usually it means "What-The-F**k")
HRM = Hardware Reference Manual

Therefore: "Where The F**k is my Hardware Reference Manual" :-D (HRM pic)

Sorry for the **'s but the site censors swearwords, I'm sure you can work it out.

[boing4000]

Yep I did unfortunately I also dont have a HRM to look at.
Right now Im working out that ddfstart/stop problem. Seems to be a combination of 2 signals. Bitplane data fetch stops but bitplane DMA is still working on until end of display line. That may explain heavy distortion in my beloved Vision Megademo IV and other games/demos.
I'll keep you informed about any progress.

[RedskullDC]

Hi Boing4000,

boing4000 wrote:
Yep I did unfortunately I also dont have a HRM to look at.
Right now Im working out that ddfstart/stop problem. Seems to be a combination of 2 signals. Bitplane data fetch stops but bitplane DMA is still working on until end of display line. That may explain heavy distortion in my beloved Vision Megademo IV and other games/demos.
I'll keep you informed about any progress.

Have emailed you privately.

I suspect the problem you have with overscan is in the agnus.v: beamcounter module
.....
//generate start of line signal
assign sol=(horbeam==453)?1:0;
.....

Start of line signal is hard-coded to a horizontal beam position. Not sure this this is correct when overscan is in operation.

Cheers,
Red

[boing4000]

Hello RedSkull,

thanks for your email and explanation in this function.

I also think overscan must be handled intelligent instead of fixed point. I tried to change the sol pointer, even in the slightest change has fatal impact to the generated VGA signal and make my TFT go crazy
Set to 454 the picture appears for 0.2 sec and disappear again. Set to 452 will show no picture at all!

I belief in time your ECS implementation will do this job as in real Agnus chip

[boing4000]

Who is also coding the FPGA core here?
There are a few things I want to change and/or add to the minimig.
For instance:
- make reset funktion in OSD working
- add OSD control via joystick in port 2 (up/down/fire) when active
- simulate left and right mouse button on key "print" and "pause"

If somebody could assist/help, it will be welcome!

[AJCopland]

Yaqube is over in the "Question for MiniMig users" thread he started the other day. Post in there and maybe PM him as well and you might get some more info. I'm still building my MiniMig :-(

Andy

[boing4000]

Thanks :-)