Search found 342 matches

by akuyou
Mon Jul 06, 2020 8:33 pm
Forum: PDP-11 Assembly Programming
Topic: WIP: PDP-11 (UKNC) Tutorials
Replies: 0
Views: 10

WIP: PDP-11 (UKNC) Tutorials

I'm planning to do some simple PDP-11 tutorials covering basic tasks on the UKNC Here is the early source code, if anyone spots any mistakes, please let me know HelloWorld.7z Here is 'Hello World'... I'll be covering it in the first tutorial - note the 'Monitor' is not code commented at this stage, ...
by akuyou
Mon Jul 06, 2020 12:35 pm
Forum: PDP-11 Assembly Programming
Topic: Porting the ChibiAkumas to the Elektronika MS-0511
Replies: 5
Views: 73

Re: Porting the ChibiAkumas to the Elektronika MS-0511

I'm guessing the sprite on the left is a glitch with the clipping code? Truth be told, my clipping code was very bad, because I'm awful at maths and stuff!... there was a bug in the final code, where if a code was clipped in the X and Y axis it would mess up... fortunately it almost never happened, ...
by akuyou
Sun Jul 05, 2020 6:49 am
Forum: MSX & MSX2 Assembly Programming
Topic: Video: Lesson P5 - Bitmap graphics on the TI-83 and MSX
Replies: 4
Views: 2162

Re: Video: Lesson P5 - Bitmap graphics on the TI-83 and MSX

No, I'm afraid I don't have any tutorials on that mode... I'll be covering a pixel plotting function of the '3x tilemap' mode soon

Am I reading that right? that the screen has a resolution of 64x48???
by akuyou
Thu Jul 02, 2020 7:56 am
Forum: PDP-11 Assembly Programming
Topic: Porting the ChibiAkumas to the Elektronika MS-0511
Replies: 5
Views: 73

Re: Porting the ChibiAkumas to the Elektronika MS-0511

Wow, that's absolutely amazing!... it must have taken an incredible amount of work to get any of the game working at all, and as for connecting an AY chip to the UKNC, that's really incredible.
by akuyou
Thu Jun 25, 2020 7:10 am
Forum: MSX & MSX2 Assembly Programming
Topic: Video: Lesson P31 - Hardware Sprites on the MSX1!
Replies: 17
Views: 3098

Re: Video: Lesson P31 - Hardware Sprites on the MSX1!

Well, it's quite possible I am incorrect, I only did minimal research into the video, as it was a patreon request on a topic I've not looked at before. But can I ask.. you describe a procedure here, but do not describe how the hardware does it... it sounds like you're describing what the screen does...
by akuyou
Sun Jun 07, 2020 12:19 am
Forum: 8086 Assembly Programming
Topic: What is faster: stack or registers?
Replies: 15
Views: 371

Re: What is faster: stack or registers?

Registers are going to be fastest, and you should try and use them as much as possible The stack is basically using the main memory... and if you think about the structure of the machine, the 'Registers' are built into the CPU... but the 'memory' is further away on the address bus (I know that's ove...
by akuyou
Sat Jun 06, 2020 11:47 pm
Forum: Show and Tell
Topic: Reverse Direction game for the Commander X16
Replies: 2
Views: 188

Re: Reverse Direction game for the Commander X16

Really great work!... I got to level 7

the gameplay is really well done... it feels as good as an authentic space invaders game in the movement and collision detection.

I like the enemies too... they're cute and look funny!... Do they have names like in pacman?
by akuyou
Sun May 24, 2020 9:59 am
Forum: General 6502 Programming
Topic: Video: Lesson 2 - Addressing modes on the 6502
Replies: 9
Views: 6306

Re: Video: Lesson 2 - Addressing modes on the 6502

The problem with the monitor not showing the correct value of A was a bug in the monitor asm file... I've fixed it in the latest sources.7z - please re-download and give it another go. I'm not sure why the SNES emulator is crashing - it's working OK here, I wonder if it's an issue with the emulator ...
by akuyou
Sun May 24, 2020 9:29 am
Forum: Introductions
Topic: hi there, onegaishimassss
Replies: 2
Views: 414

Re: hi there, onegaishimassss

Welcome to the forum! interesting to hear of your experiences with the old machines, I was a CPC person myself. I only did basic back in the days, and these days I don't do so much programming in my day job, so it's great to get to do some programming for fun in assembly! So you're looking at 6502 t...
by akuyou
Tue May 05, 2020 12:04 pm
Forum: MSX & MSX2 Assembly Programming
Topic: Video: Lesson P31 - Hardware Sprites on the MSX1!
Replies: 17
Views: 3098

Re: Video: Lesson P31 - Hardware Sprites on the MSX1!

Firstly make sure you've got interrupts disabled - the interrupt handler may mess with the VDP, so could be causing this.

If that fails, The VDP can take a little time to process the OUT commands... so put a few NOPs after each OUT and see if that fixes it.

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