Commodore Computer C16 Manual de usuario descargar pdf (Pagina 6)

YOUR OWN CHARACTER SET

First you have to tell that characters should be fetch from RAM. This

is done by clearing the second bit of the TED register number 65298 ($FF12):

poke 65298, peek (65298) and 251

Then you must select a "memory page" where your character set is stored.

Each page is 1024 bytes long, so on the C16 there are 16 possible locations:

Page 0: character set starts at memory address 0

Page 1: character set starts at memory address 1024

Page 2: character set starts at memory address 2048

...

Page 14: character set starts at memory address 14336

Page 15: character set starts at memory address 15360

(On the Plus4 there are more pages, probably 64)

Bits 2-7 of the TED register number 65299 ($FF13) determine, which page

should be used. To select a page do as follows:

poke 65299, (peek (65299) and 3) or (page * 4)

Another way of doing the same thing is to take the first byte in the address (as

long as one of the pages are used). For example, page 15's address is 15360. The

hex number for this is $3c00. So you can just poke 65299, dec(“3c”).

When using Basic one should protect the character set so, that Basic's program

text does not overwrite your character data. This can be done by setting the

upper limit for the Basic text, i.e. the highest address Basic is allowed to

use. To do that, use memory addresses 55 ($37) and 56 ($38). 55 is the lower

half of the 16 bit address and 56 is the upper half. Read more on page 9:

"Limiting the basic memory".

To switch back to ROM character set, just set the 2nd bit of the 65298 and set

the page back to page 52:

poke 65298, peek (65298) or 4 : poke 65299,208

ESCAPE CODES

Cancel quote and insert mode ESC O

Cancel started Esc code ESC X

Erase to end of current line ESC Q

Erase to start of current line ESC P

Move to start of current line ESC J

Move to end of current line ESC K

Enable auto-insert mode ESC A

Disable auto insert mode ESC C

Delete current line ESC D

Insert line ESC I

Enable scrolling ESC L

Disable scrolling ESC M

Scroll up ESC V

Scroll down ESC W

Set bottom of screen window ESC B

Set top of screen window ESC T

Set window to full screen minus 1 and clear ESC R

Set window to full screen and clear screen ESC N

Example: Press Esc followed by A for auto insert mode, or PRINT CHR$(27);"W" to

scroll the screen down from basic.

MORE SPECIAL KEYS

Pause output CTRL S (any key to resume)

Slow down output Commodore

Set window to full screen Home twice

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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Commodore Computer C16 Manual de usuario Pagina 6

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