This is an archived, read-only copy of the United-TI subforum , including posts and topic from May 2003 to April 2012. If you would like to discuss any of the topics in this forum, you can visit Cemetech's
z80 & ez80 Assembly subforum. Some of these topics may also be directly-linked to active Cemetech topics. If you are a Cemetech member with a linked United-TI account, you can link United-TI topics here with your current Cemetech topics.
Z80 & 68k Assembly =>
z80 & ez80 Assembly
| Author |
Message |
|
Tyraniek
Member
Joined: 07 Jun 2003
Posts: 133
|
 Posted: 12 Jun 2003 07:57:02 am Post subject: |
|
|
Can everyone tell me what are the input and the output of this romcall ?
I thought that the coordonates of the pixel to test were B, C, and that A was equal to 1 if there was a pixel on, but id doesn't seem to be right ; indeed, when I run my program, I've got an "Error : Domain".
Why ? How to use this rom_call ? Or maybe do you have a similar routine which works with the plotsscreen... |
|
| Back to top |
|
|
John Barrus
Member
Joined: 25 May 2003
Posts: 131
|
| Posted: 12 Jun 2003 10:55:30 am Post subject: |
|
|
You are probably confusing pixeltest with ipoint.
the _ipoint romcall will either turn a point on, off, invert, or test it.
The coords of the point are loaded into b and c and the operation you want to do is loaded into d:
0 - turn off
1 - turn on
2 - invert
3 - test
4 - copy from buffer to display
the z flag is 1 when the point is on, 0 when the point is off. |
|
| Back to top |
|
|
Tyraniek
Member
Joined: 07 Jun 2003
Posts: 133
|
| Posted: 13 Jun 2003 07:06:09 am Post subject: |
|
|
| OK thanks, it is a perfect explication |
|
| Back to top |
|
|
David
The XORcist!
Advanced Member
Joined: 20 May 2003
Posts: 268
|
| Posted: 13 Jun 2003 02:48:49 pm Post subject: |
|
|
PixelTest is a pretty dumb romcall. It expect the coordinates to be in OP1/OP2, and in floating point format  |
|
| Back to top |
|
|
Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
|
| Posted: 13 Jun 2003 08:14:48 pm Post subject: |
|
|
u mean point test? pixel, is a point on the screen, point is a point on the graph... a pixel cannot be at halfway, but a point can! thus u need floating point for point, integer for pixel!
Last edited by Guest on 13 Jun 2003 08:15:02 pm; edited 1 time in total |
|
| Back to top |
|
|
John Barrus
Member
Joined: 25 May 2003
Posts: 131
|
| Posted: 14 Jun 2003 05:42:41 am Post subject: |
|
|
| No, he means pixeltest. It does seem pretty stupid if the same thing can be accomplished by using ipoint. |
|
| Back to top |
|
|
Job the GameQuitter
Member
Joined: 04 Jun 2003
Posts: 102
|
| Posted: 14 Jun 2003 07:39:02 am Post subject: |
|
|
Out of personal experience I can say that using direct LCD communication gives a speed increase close to 500% when used instead of IPoint  . Except when you're using an SE with 15mhz mode, then it's "only" 100%. |
|
| Back to top |
|
|
|
Register to Join the Conversation
Have your own thoughts to add to this or any other topic? Want to ask a question, offer a suggestion, share your own programs and projects, upload a file to the file archives, get help with calculator and computer programming, or simply chat with like-minded coders and tech and calculator enthusiasts via the site-wide AJAX SAX widget? Registration for a free Cemetech account only takes a minute.
»
Go to Registration page
