Search found 4673 matches
- Wed Oct 12, 2005 6:34 am
- Forum: Programming
- Topic: Can Screen or Char memory go into expansion memory ..
- Replies: 9
- Views: 2893
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...
- Tue Oct 11, 2005 6:44 am
- Forum: Programming
- Topic: Can Screen or Char memory go into expansion memory ..
- Replies: 9
- Views: 2893
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 ...
- Thu Oct 06, 2005 7:21 am
- Forum: Programming
- Topic: Crunch this BASIC code
- Replies: 6
- Views: 1866
- Wed Oct 05, 2005 12:54 am
- Forum: Hardware and Tech
- Topic: dc motor driver circuit
- Replies: 13
- Views: 3654
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
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
- Tue Oct 04, 2005 10:53 am
- Forum: Hardware and Tech
- Topic: dc motor driver circuit
- Replies: 13
- Views: 3654
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...
- Tue Sep 06, 2005 12:44 am
- Forum: Programming
- Topic: ROM calls and other tricks
- Replies: 33
- Views: 65737
- Thu Sep 01, 2005 1:09 am
- Forum: General Topics
- Topic: Hiya All
- Replies: 4
- Views: 2166
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...
- Wed Aug 31, 2005 12:52 am
- Forum: General Topics
- Topic: Hiya All
- Replies: 4
- Views: 2166
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...
- Thu Aug 25, 2005 6:54 am
- Forum: Programming
- Topic: Sprites in ML
- Replies: 55
- Views: 22594
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
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
- Wed Aug 17, 2005 5:55 am
- Forum: Programming
- Topic: ML routines in BASIC programs
- Replies: 9
- Views: 5920
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...
- Tue Aug 09, 2005 2:03 pm
- Forum: Programming
- Topic: Tape Autostart
- Replies: 0
- Views: 1918
Tape Autostart
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...
- Wed Aug 03, 2005 1:11 am
- Forum: General Topics
- Topic: multicolor and hires graphics
- Replies: 10
- Views: 4504
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| ...
- Mon Jul 25, 2005 1:51 am
- Forum: General Topics
- Topic: multicolor and hires graphics
- Replies: 10
- Views: 4504
@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
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
- Wed Jun 01, 2005 3:13 am
- Forum: Programming
- Topic: Tip - Get a calculator that can use HEX, BIN etc!
- Replies: 24
- Views: 6195
- Tue May 31, 2005 9:34 am
- Forum: Programming
- Topic: Tip - Get a calculator that can use HEX, BIN etc!
- Replies: 24
- Views: 6195