Denial

Martin, I had published an example program here in Denial, that utilises the 160x192 bitmap mode. It was hosted on my student's account, which now unfortunately is defunct. Until I get the time to set up a new web-site the program can't be accessed from here. If you are interested, PM me your e-mail...

The VIC can only address RAM that's built into the machine. That said, to implement 160x192 pixels, I let both screen memory and char memory start at $1000, thus I write $CC into $9005. The first usable character is 'P', and so the bitmap effectively starts at $1100. We had another discussion about ...

Hmm, 1 DIMDY(3),DD(3):FORT=0TO3:READDY(T),DD(T):NEXT:DATA15,-1,300,-10,-15,1,-300,10 2 INPUT A 3 TI$="000000" the main program reduces to: 10 Y=Y+DY(A-9):D=D+DD(A-9) and ends with: 14 PRINT TI,FRE(0),Y,D FRE(0) reports 3362 Bytes free (as opposed to your second solution with 3443 Bytes fre...

Uhh, yes!

You need two additional transistors, to prevent that happen.

I found a diagram at http://vsim.freeservers.com/walk-kit.html for a H-Bridge:



Me sorry,

Michael

If you put +5 Volts to the left I/O Line, the left NPN will open, while the PNP will shut off. Additionally if you put 0 Volts to the right I/O line, you'll short circuit the upper right PNP and lower left NPN transistor, probably not what you've intended. The H-Bridge can be made of four relay swit...

SYS(53387)E$ also works. Here 53387 is included in parenthesis so E can't be mistaken as ...

Michael

Some digital archeology - this is the file information of the image I possess. sa00.jpg: Size 768x512, 44780 Bytes, Date December 3rd, 1993. The Arcade BBS has stored the same file, under ftp://arcade.demon.co.uk/data/067500/068200/068234 I presume this is a version that underwent no additional proc...

Hi Ratamnim, Welcome to this forum. I'll take it for granted you've also used an Acorn RiscPC before... since your 'avatar' clearly is sa00.jpg from THE slide show. Seriously, yesterday I installed all those 100 images as screen saver slide show on my PC at work. :) What a coincidence. Greetings, Mi...

I've found the following code example:

http://wwwhome.cs.utwente.nl/~schooten/ ... bitmap.txt

It displays XOR'ed sprites (or should one say 'shapes' a la C16/+4/C128?) within a 176x176 bitmap.

Michael

This is my version, a BASIC/ML hybrid: 0 POKE1,18:POKE2,16:REM{39 Z's} 1 FORT=0TO38:READA:POKE4114+T,A:NEXT 2 DATA173,31,145,74,74,41,7,170,173,32,145,73,128,41,128,10,125,50,16,8 3 DATA168,173,57,16,40,16,2,169,255,76,145,211,255,21,233,255,255,22,234 RUN this once. After this you can delete the li...

Hi, all, This one could probably fit in the section 'ML and Other Programs' as well, I decided against it, because it's only a tool, not a program in its full right. Anyway, here we go: Write a autostart header to tape: 10 FORT=1TO32:READA:M$=M$+CHR$(A):NEXT 11 N$="AUTOSTART" 12 S$=LEFT$(N...

I didn't see that CurtisP suggested top to bottom, then right to left , but ... at first the array DIM B(7) shall contain B(0)=128, B(1)=64, ... , B(7)=1 ... then, if you put the characters left to right, and then top to bottom you'll get this address-scheme (assuming double-height chars 20x12): 0| ...

@CurtisP:

Of course we don't want to re-create the, uhm rather interesting, addressing scheme of the C=64.

@Thomas:

I'd vote for 160x192, too. It makes optimal use of the memory between 4096 and 8191, and it doesn't clobber the bottom 1K. I employ this mode for my program VIC Life.

Michael

First of all: 3735928559=57005*65536+48879

And they are useful values to indicate uninitialised memory, when read in Hex.

Octal numbers are used in the chmod command in Un*x. In former times there were machines with 6-bit bytes (as the CDC's), where 2-digit octal numbers "naturally" fit into. And, to get back to: [...]decimal equivalence of $7CBA?[...] I just could ask, what is the hexadecimal equivalence of ...