Search found 41 matches

by TOUKO
Tue Jul 29, 2014 4:24 pm
Forum: PC-Engine
Topic: Hardware Resources
Replies: 6
Views: 4285

Re: Hardware Resources

Yes if docs on archaic are right, the VDC read/write on vram seems to be close to 1 MS / byte , it's really fast ..

A ram/rom -> VRAM DMA could be great ..
by TOUKO
Wed Jul 16, 2014 7:30 am
Forum: PC-Engine
Topic: Hardware Resources
Replies: 6
Views: 4285

Re: Hardware Resources

Thanks tom, i understand now .

But i think puting datas in vram in burst mode is not really faster than in active display, because the CPU cannot benefit of all BW, right ??
by TOUKO
Tue Jul 15, 2014 2:31 pm
Forum: PC-Engine
Topic: Hardware Resources
Replies: 6
Views: 4285

Re: Hardware Resources

Some good informations on archaic, but some errors too .. I don't understand how works the burst mode . As i understood in archaic's tech docs, burst mode is enabled by VDC when the TV beam is in the overscan area . In burst mode the CPU has unrestricted access to VRAM, huuum, i always thought that ...
by TOUKO
Thu Feb 09, 2012 6:40 pm
Forum: PC-Engine
Topic: Problem with _cd_execoverlay
Replies: 10
Views: 3538

Re: Problem with _cd_execoverlay

ok tom, but be patient, i must make a little exemple, light for send ..
by TOUKO
Sun Feb 05, 2012 9:52 am
Forum: PC-Engine
Topic: Problem with _cd_execoverlay
Replies: 10
Views: 3538

Re: Problem with _cd_execoverlay

Yes, if i put my irqs code in startup.asm, when i load the next overlay, it keep the last overlay startup code ..

it seems that only a part of bank0 was keep,bacause if i put my irq code in bank0 indeed my loaded overlay it works ..
I don't know if i 'am clear :mrgreen:
by TOUKO
Sun Jan 08, 2012 2:05 pm
Forum: PC-Engine
Topic: Problem with _cd_execoverlay
Replies: 10
Views: 3538

Re: Problem with _cd_execoverlay

:o Thanks mooz that's an explanation .. i use this piece of code for my perso irq . stw #User_Vsync_Irq,vsync_hook ; // Gestionnaire VSYNC perso smb #4,<irq_m ; // enable new code stw #User_Hsync_Irq,hsync_hook ; // Gestionnaire HSYNC perso smb #6,<irq_m ; // enable new code Bios irq are always avai...
by TOUKO
Sat Jan 07, 2012 7:49 pm
Forum: PC-Engine
Topic: Problem with _cd_execoverlay
Replies: 10
Views: 3538

Re: Problem with _cd_execoverlay

Thanks mooz, i have red this from the same pdf, but my understading of this function is :shock: Do you think that is possible to reload all the banks from an overlay ???, because i'am using different vsync and hsync irq (and other functions) stored in bank 0. Now i can load correcly an overlay, but ...
by TOUKO
Fri Jan 06, 2012 6:52 pm
Forum: PC-Engine
Topic: Problem with _cd_execoverlay
Replies: 10
Views: 3538

Re: Problem with _cd_execoverlay

But someone know how works cd_exec routine ???

Because huc function seems to load only datas after bank0, and i have different datas in this bank for all my overlays :(
by TOUKO
Fri Jan 06, 2012 9:02 am
Forum: PC-Engine
Topic: Problem with _cd_execoverlay
Replies: 10
Views: 3538

Re: Problem with _cd_execoverlay

No answers ?? :(

i'am doing it more easily:
How to execute another overlay ???

Image

EDIT: ok resolved, it don't work because i have not desabled interupts before call cd_execoverlay

Thanks ..
by TOUKO
Thu Jan 05, 2012 9:58 am
Forum: PC-Engine
Topic: Problem with _cd_execoverlay
Replies: 10
Views: 3538

Problem with _cd_execoverlay

Hi all, i have a big problem with cd_execoverlay function .. It doesn't work .. But loading datas(sound and gfx only) from a third, works fine .. My question is, how overlay exec works in general (not the huc function) .. I have two overlays (with different startup.asm,it's probaly the problem) and ...