datanguay@watdaisy.UUCP (05/14/87)
In EGA Bios ram there is a pointer at 0040:00a8 which points to a table of pointers. The second of these pointers points to a buffer into which the values for the palette registers will be saved. How do I get bios to do the save? I have tried setting up my own pointer table (by changing the pointer at 04:00a8 to another set of pointers with my own values) and then setting a register. I also tried int 10h ah=12h bl=10 (both hex and decimal), which is a call to return ega info. David Tanguay
apn@nonvon.UUCP (05/17/87)
in article <8314@watdaisy.UUCP>, datanguay@watdaisy.UUCP says: > > In EGA Bios ram there is a pointer at 0040:00a8 which points to a table > of pointers. The second of these pointers points to a buffer into which > the values for the palette registers will be saved. How do I get bios > to do the save? I have tried setting up my own pointer table (by changing > the pointer at 04:00a8 to another set of pointers with my own values) and > then setting a register. I also tried int 10h ah=12h bl=10 (both hex and > decimal), which is a call to return ega info. > > David Tanguay assume hex How about using int 10, ah=10,al=0,bh=color value, bl=palette register or if setting all of them then try int 10, ah=10, al=2, es:dx = segment:offset of color list which is 17dec bytes 0-f are color values to be loaded to palette registers 0-f byte 10 is the new border value color register. Alex P Novickis 707 575 9616 UUCP: {ihnp4,ames,qantel,sun,seismo,amdahl,lll-crg,pyramid}!ptsfa!nonvon!apn {* Only those who attempt the absurd ... will achieve the impossible *} {* I think... I think it's in my basement... Let me go upstairs and check. *} {* -escher *}
datanguay@watdaisy.UUCP (05/17/87)
In article <317@nonvon.UUCP>, apn@nonvon.UUCP (root) writes: > in article <8314@watdaisy.UUCP>, datanguay@watdaisy.UUCP says: > > > > In EGA Bios ram there is a pointer at 0040:00a8 which points to a table > > of pointers. The second of these pointers points to a buffer into which > > the values for the palette registers will be saved. How do I get bios > > to do the save? I have tried setting up my own pointer table (by changing > > the pointer at 04:00a8 to another set of pointers with my own values) and > > then setting a register. I also tried int 10h ah=12h bl=10 (both hex and > > decimal), which is a call to return ega info. > > > > How about using int 10, ah=10,al=0,bh=color value, bl=palette register > or if setting all of them then try > [....] Oops. Sorry for the lack of clarity, but I want to *read* the values of the palette registers, not write them. Thanks... David Tanguay
apn@nonvon.UUCP (root) (05/18/87)
in article <8320@watdaisy.UUCP>, datanguay@watdaisy.UUCP says: >> How about using int 10, ah=10,al=0,bh=color value, bl=palette register >> or if setting all of them then try >> [....] > > Oops. Sorry for the lack of clarity, but I want to *read* the values of the > palette registers, not write them. Thanks... > That one is a bit tougher. The EGA card you have is probably based on the C&T chip set. DId you say you would like to be hardware independant on this ?? (*laugh* *cough*) One way to do it independantly is to write a system "extension" and filter all int 10 calls and trap the useful infor- mation and keep around in ram somewheres. Then just jump to where the old int 10 went to. This is the only system/hardware independant way that I found. Now for some hardware dependent methods: C&T chipset : no way!! palette registers are W/O (write only) paradise chipset : roumor is that it is possible Possible help: Some mouse drives do the above for you... lets see who: logitech : Yes, ega functions can be done through logitech microsoft : Yes, ........... (same).....,................. however, since m/s 's drivers are not written by them I am not sure if the version they are now shipping does this or not... It is certainly not in their application note. After talking to the people that write their drivers I concluded that (see note below) it was a very new feature and may only be in house as of 1/87 contriver: no way. This driver does not even know about EGA cards (or pretend to!!) In either case, it may be easier to do the stuff youself and not bother with the 3 zillion versions of mouse drivers around. (note: as promised up above somewheres) I contacted the driver people a while back because I was in a position of needing a much-more-flexible-than-what's-available driver written for a new (and actually working and available) pointing device. I'm still writting it, after 2 months and plan to make it public domain unless you are one of the above mentioned companies (*evil grin*) Alex P Novickis Fulcrum Consulting UUCP: {ihnp4,ames,qantel,sun,seismo,amdahl,lll-crg,pyramid}!ptsfa!nonvon!apn {* Only those who attempt the absurd ... will achieve the impossible *} {* I think... I think it's in my basement... Let me go upstairs and check. *} {* -escher *}