MSX1 boot "logo" | MSX Resource Center (Страница 7/13)

Ascended (16965)

09-05-2018, 08:22

Pippo, I was talking about the screen 0 version... No need to apologize of course. I liked it a lot, still. But it was not entirely what I had in mind.

By gdx

Prophet (3749)

09-05-2018, 16:57

*deleted by request of gdx*

By Pippo

Champion (457)

09-05-2018, 11:39

Manuel wrote:

Pippo, I was talking about the screen 0 version... No need to apologize of course. I liked it a lot, still. But it was not entirely what I had in mind.

Really thank you, Manuel.
I sincerely hope you will find the perfect logo you are looking for.

Have a very glad day!

By FiXato

Scribe (1608)

09-05-2018, 17:02

Video of gdx's version

By PingPong

Prophet (3555)

09-05-2018, 22:21

Is this the way the msx 2 logo is built? By means of line commands?
This save memory!

By DamnedAngel

Master (187)

09-05-2018, 22:43

Pippo,
For the record, although your solution is obviously not the one that squeezes the most from MSX1's video capabilities, it is the one I, particularly, liked most. I think it captures my feelings of when I first unboxed my Hotbit, back in '85. Simple and beautiful.

Thanks for that and cheers!

By Pippo

Champion (457)

10-05-2018, 05:03

I see, Angel.
I was aware my version was a "little" big in size and it was without video effects compared to Msx-1 video capabilities.
Eventually, I hope to do better.
Thank you very much for the compliments and your kind opinion.
They are much appreciated, really.

Cheers to you too.

By gdx

Prophet (3749)

10-05-2018, 10:27

PingPong wrote:

Is this the way the msx 2 logo is built? By means of line commands?

Yes, I just arranged a bit the program to economize 89 bytes. (In machine language it is a bytes transfer instead of the LINE instruction.)

The basic program can be simpler and a little faster by replacing the lines 40-60 with the lines below.

40 C=1:LINE(239,Y)-(16,Y),1:T=1
50 READ V$: V=VAL("&H"+V$)
60 IF V<255 THEN LINE-STEP(V-T,0),C: C=(C XOR15)+1: T=0: GOTO50

Some explanations:
- Variable T shifts the MSX to the left in its frame (because there is probably an error in first value of each line).
- Each DATA line corresponds to one line of the logo. (FF indicates to go to the next line.)
- A black line is drawn across the full width of the logo before tracing the rest.

By theNestruo

Master (199)

10-05-2018, 12:01

You can optimize the speed a bit by removing T, and "unrolling" the first LINE as an special case.
Also, C=(C XOR15)+1 can be further optimized as C=C XOR 14 (i.e.: C=C XOR 1 XOR 15).

By theNestruo

Master (199)

10-05-2018, 14:46

gdx's version in MSXPen: https://msxpen.com/codes/-LC93np5mWSMKtY757Q9
Applying some optimizations: https://msxpen.com/?code=-LC93DZHWjuLugWRqxFw
:)