Search found 6 matches

by PierreGTT
Fri Feb 18, 2022 11:16 am
Forum: PC-Engine Assembly Programming
Topic: Lesson P33 - Hardware Sprites on the PC Engine (TurboGrafx-16)
Replies: 6
Views: 8580

Re: Lesson P33 - Hardware Sprites on the PC Engine (TurboGrafx-16)

Or maybe simply setting sprite's coordinates to 0,0 so that the sprite doesn't display in the visible area of the screen would be enough...
by PierreGTT
Thu Feb 17, 2022 11:54 am
Forum: PC-Engine Assembly Programming
Topic: Lesson P33 - Hardware Sprites on the PC Engine (TurboGrafx-16)
Replies: 6
Views: 8580

Re: Lesson P33 - Hardware Sprites on the PC Engine (TurboGrafx-16)

Other question: Let's suppose I need 4 sprites, I will set up first 4 SATB entries so that they point the sprites defined in VRAM. Shall I also setup remaining 60 entries so that they point a neutral (invisible) sprite to avoid displaying unexpected patterns? This question is worth as unless I'm wro...
by PierreGTT
Thu Dec 16, 2021 8:33 pm
Forum: PC-Engine Assembly Programming
Topic: Lesson P33 - Hardware Sprites on the PC Engine (TurboGrafx-16)
Replies: 6
Views: 8580

Re: Lesson P33 - Hardware Sprites on the PC Engine (TurboGrafx-16)

Hi, In my PCE program, some text is displayed as background. There is also a cursor made from hardware sprites. I would like the text to be video inverted when the cursor moves over. Is there any hardware XOR operation that could be done between background and sprite's pixels or is it to be done thr...
by PierreGTT
Thu Dec 16, 2021 4:33 pm
Forum: PC-Engine Assembly Programming
Topic: < > operators
Replies: 2
Views: 2477

Re: < > operators

OK, thanks for your answer.

As per my understanding, they're not mandatory and can be easily overcome through the use of several alternatives.
by PierreGTT
Tue Dec 07, 2021 4:44 pm
Forum: PC-Engine Assembly Programming
Topic: < > operators
Replies: 2
Views: 2477

< > operators

Hello, Some instructions make use of < > operators, I was told they are intended to ease selection of low or high order byte of an expression. However, I get a " Syntax error in expression" error while assembling with pceas2.exe. Is it that usage of those operators is non standard and not ...

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