SpritesMind.Net

woow never seen a VA7 model1 genesis... thats a lot of wasted circuit board... that's the "bridge" between model1 & 2

my MD is a V6.8 and has VDP, YM2612, and bus master in distinct components (and an Hitachi 68HC000)

What's usualy the best board revision for overclock?

If that command register is required to program then yes it is impossimble to program flash from flash without running code from ram or from another memory that is not the one that will be written But if it is just Addresses,CS,data and WE it is possible... thats what sonic3 does: runs code from 0~1...

You cant just select flash (CS), especify addresses, give data and activate WE? Looking at a 29LV160 datasheet from MX, iI didn't see no write timing diagram except for that command register... At the moment I can only program memories using the classic method, since I use a 2-stage 12bit counter at...

Sonic3 RAM may be intimidating but its just like a normal static RAM, but they decided do go the no-battery way and threw in a nonvolatile RAM from ramtron If you have a full range flash (0~4MB) sonic3 alone will probably save in the upper 2MB even without the fancy decoders and logic but if it is s...

Ahhh its a thermistor, so it's a variable resistor... Build a voltage divider -> put the output in a 8bit ADC, mux the 8bit input to a 4bit output like a megadrive controller does, then use the 68000 to read the controller port, setting TH high then low http://img461.imageshack.us/my.php?image=termo...

LOL the thermostat is a switch so wire it to key UP for example and use the 68000 to read the control port, but is that thermo suitable for the range temperatures you're dealing with? I have one but it toggles at 25~50 (it's ajustable) there is no need to mod a mega drive board AND you could control...

Yup YS gets out the VDP directly to the cartridge slot and yes I see it now it is the backround, thanks Fonzie it fits perfectly with the pictures i posted: the VDP draws the Background color when YS is low look at the 1st picture: it draws background right before and after HSYNC pulses and fills th...

Well I do't think so because the MD RGB always comes to the 32X and there it is decided based on a priority bit if the output is from MD or from 32X and YS was present on the cartridge port problably before 32X existed ever in paper, so how could they knew? And since I was running sonic&knukcles in ...

Since I got the megadrive schematics this always bothered me... a wire that just connects the VDP to the cartridge port... So I took my Supa Megadrive with S&K to college to plug YS to a osciloscope and got this: http://img393.imageshack.us/img393/5426/parte1gg1.th.png http://img393.imageshack.us/my...

Well thanks for testing it , and i tested your routine you first posted and it did it ok, so i couldn't find the error... and btw you were trying do DMA more than 64K? or was just memory mirroring?

Actually I didn't, as I optimized my routines BEFORE you posted your message :wink: (and I don't keep old code). BTW, you can change these 2 AND.B to OR.B under LowAddress label, should be faster then. LOL I always make my code work in the 1st place and then I try to optimize it if possible 8) I ed...

Jorge Nuno wrote:
EDIT: umm you are not cleaning d2 enough i think...


try putting this AND.l #$00030000, d2 instead of clr.w d2 in the LoadTiles section

Did you tried this? ^^

It was on my previous post but it was for your old routine


And now my routine uses less registers

Well this is my crappy DMAcopy routine (LOL), always works in fusion and can do DMA to CRAM also, but it needes heavy optimisation in size and speed (comparing to yours) Can you test it please? Read the "Parametros" to see the inputs to make this work ;***********************************************...

IF you could make a line doubler for example it would store one RGBline in RAM1 and reading another one (RAM2) containing the former line @ twice the speed and 2 times then it swaps RAMS (store RGB line in RAM2 and reading from RAM1) of course the RGB needs to be converted to digital for the doubler...