Search found 40 matches

by John
Fri Feb 19, 2021 8:10 pm
Forum: General Z80 Programming
Topic: Video: Lesson Aku21+22 - RLE bitmaps with AKUSprite
Replies: 1
Views: 13870

Re: Video: Lesson Aku21+22 - RLE bitmaps with AKUSprite

The compression algorithm here

https://www.youtube.com/watch?v=gpsvgWsTX1I

also used in this impressive zx81 hi-res demo

https://www.youtube.com/watch?v=gpsvgWsTX1I

gives on average (for an arbitrary image) better compression than RLE. It also easy to implement. It basically summarised as ...
by John
Fri Feb 19, 2021 6:58 pm
Forum: Other Z80 Systems
Topic: BBC Bridge Companion
Replies: 4
Views: 16503

BBC Bridge Companion

Hello Keith,

The BBC bridge companion is a classic 8-bit console of the British Broadcasting Corporation. I own this console. It has 12 game control keys. It is the first proper games console (by that I mean it uses cartridges) to be sold in England and made in England. It has TMS9--- VDP and a Z80 ...
by John
Sun Jan 17, 2021 2:07 am
Forum: General Z80 Programming
Topic: Another rather newbie question
Replies: 4
Views: 13836

Re: Another rather newbie question

Hi Nephesh,

If you didn't understand Keith's explanation I will add a little more to it so maybe you can understand it. To convert a hex value to an ASCII letter first notice that in the ASCII table there is a gap, of size 7,between the two groups of characters 0 to 9 and A to F, this obviously ...
by John
Sat Jan 16, 2021 5:46 am
Forum: MSX & MSX2 Assembly Programming
Topic: Video: Lesson P5 - Bitmap graphics on the TI-83 and MSX
Replies: 11
Views: 30193

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

I had a read of some of documentation screen 3.

The screen three mode (as it is known in MSX BASIC) can have 16 colours on screen and each pixel in the the 68 by 48 screen can be set to any of the 16 colour without any restrictions.

The common definition of bitmap means there is a one to one ...
by John
Fri Jan 08, 2021 6:39 am
Forum: MSX & MSX2 Assembly Programming
Topic: Video: Lesson P5 - Bitmap graphics on the TI-83 and MSX
Replies: 11
Views: 30193

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

All right. Personally, to be frank, I would not sponsor you to do it-if that what your reply above may mean-because the reason but I am unable to do it, for now, is because I can't find any information,so far, on it on how to plot a screen 3.


I can't find any information,so far, on it on how to ...
by John
Sat Jan 02, 2021 12:17 am
Forum: MSX & MSX2 Assembly Programming
Topic: Video: Lesson P5 - Bitmap graphics on the TI-83 and MSX
Replies: 11
Views: 30193

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

I did my own pixel plot function for the MSX1 in screen 2 a few months ago, and I used it for that basis of lines, then 3d wireframe models, but I found it was too slow for such 3d graphics.
I came to the conclusion that coloured 3d wire frames graphics on MSX1 can be done at a good speed in MSX1 ...
by John
Sun Dec 20, 2020 5:50 pm
Forum: MSX & MSX2 Assembly Programming
Topic: Video: Lesson P10 - Tilemap graphics on the MSX1
Replies: 13
Views: 51515

Is this another bug in Akusprite?-Or did I misunderstand something?

Hello Keith,

This is regarding the Akusprite image conversion to MSX1 screen 2 (the 8x1 color node),
when I am doing a conversion from akusprite , so akusprite generates the exported files
.RAW and .RAW.COL, of the test image for MSX1 screen 2 in 8x1 color , the colors
are not what I expected ...
by John
Sat Jul 18, 2020 4:21 pm
Forum: MSX & MSX2 Assembly Programming
Topic: Video: Lesson P31 - Hardware Sprites on the MSX1!
Replies: 24
Views: 50834

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

The problem I am having for completing a game is making Arkos Tracker 2 work properly
I mention the problem at the page
Video: Lesson P35 - Playing Digital Sound with WAV on the AY!

I guess the issue is CBIOS differs from the real MSX 1 BIOS in a way that makes Arkos tracker 2 fail on a real MSX 1 ...
by John
Fri Jul 17, 2020 11:46 am
Forum: MSX & MSX2 Assembly Programming
Topic: Video: Lesson P31 - Hardware Sprites on the MSX1!
Replies: 24
Views: 50834

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

"Unless you have some clever ideas to exploit this (like objects that move with the screen - staying in their 3rd)"

I have though about this again. I do not think you need clever ideas to do vertical scrolling if that is what you meant in your video lesson P52 (https://youtu.be/pobGYc2iPfE) you ask ...
by John
Wed Jul 15, 2020 1:57 pm
Forum: MSX & MSX2 Assembly Programming
Topic: Video: Lesson P10 - Tilemap graphics on the MSX1
Replies: 13
Views: 51515

Bug in Akusprite conversion to MSX tiles?

Hello Keith,

I think there may be a bug in akusprite. So I have a 16x16 BMP test image
(imagetoconverttomsxtiles.bmp in the zip file attached) to convert to MSX 8 by 8 pixel tiles,with 8 bytes in a tile
to demonstrate the problem; thes test image is also shown as a png image in this message.
The ...

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