Cycle 1 HMOVE

[Kylearan]

Hi,

 

if I read the HMOVE table at http://www.qotile.net/minidig/code/hmove.txt right, it shouldn't make any difference if I do a STA HMOVE at cycle 0 (e.g., immediately after a STA WSYNC) or cycle 1, correct? Is it known if this behavior is compatible over different 2600 models?

 

In particular, I would like to move P0 and P1 8 pixels to the right (HMPx=0x80), but in my kernel the STA HMOVE might happen either at cycle 0 or cycle 1. Making sure it would always happen at cycle 0 would cost me >300 bytes of ROM, which I would like to avoid.

 

I know that HMOVEs at cycle 73, 74 or 75 behave differently on some models, but does anyone know if a HMOVE at cycle 1 is fully compatible with all 2600 models?

 

Thanks,

 

-Kylearan

 

 

 

[+SpiceWare]

Cycles counts are after the instruction runs, so an STA HMOVE that's done immediately after an STA WSYNC occurs at cycle 3.

 

...
   sta WSYNC; 76/0
   sta HMOVE;  3

[Kylearan]

Ah okay, looks like I use a different terminology, sorry. So to clarify my question:

 

Will a STA HMOVE at cycle 3 behave the same as if it occurs at cycle 4 on different 2600 models?

[LS_Dracon]

According this doc, odd changes happens only after cycle 10.

So yes, anything besides 10th cycle will works exactly as should be.

 

But yes, different TIA versions behave differently. I would say always hit HMOVE right after WSYNC, unless you're trying some new stuff.

 

Hmove right after Wsync works fine on all consoles BTW.