Apple-2-SW/prog8
1
0
Fork 0
mirror of https://github.com/irmen/prog8.git synced 2024-09-27 11:56:10 +00:00
Code Issues Projects Releases Wiki Activity

added notes to textio about PETSCII vs Screencode encoding.

Browse Source
This commit is contained in:
Irmen de Jong 2023-11-06 23:18:24 +01:00
parent ee2888e744
commit 4de012fc49
5 changed files with 30 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
compiler/res/prog8lib/c128/textio.p8
View File

@ -1,4 +1,6 @@
; Prog8 definitions for the Text I/O and Screen routines for the Commodore-128
; All routines work with Screencode character encoding, except `print`, `chrout` and `input_chars`,
; these work with PETSCII encoding instead.
%import syslib
%import conv
@ -238,10 +240,10 @@ _scroll_screen ; scroll only the screen memory
}}
}
romsub $FFD2 = chrout(ubyte char @ A) ; for consistency. You can also use cbm.CHROUT directly ofcourse.
romsub $FFD2 = chrout(ubyte char @ A) ; for consistency. You can also use cbm.CHROUT directly ofcourse. Note: takes a PETSCII encoded character.
asmsub print (str text @ AY) clobbers(A,Y) {
; ---- print null terminated string from A/Y
; ---- print null terminated string, in PETSCII encoding, from A/Y
; note: the compiler contains an optimization that will replace
; a call to this subroutine with a string argument of just one char,
; by just one call to cbm.CHROUT of that single char.
@ -427,7 +429,8 @@ asmsub print_w (word value @ AY) clobbers(A,X,Y) {
}
asmsub input_chars (uword buffer @ AY) clobbers(A) -> ubyte @ Y {
; ---- Input a string (max. 80 chars) from the keyboard. Returns length in Y. (string is terminated with a 0 byte as well)
; ---- Input a string (max. 80 chars) from the keyboard, in PETSCII encoding.
; Returns length in Y. (string is terminated with a 0 byte as well)
; It assumes the keyboard is selected as I/O channel!
%asm {{

9
compiler/res/prog8lib/c64/textio.p8
View File

@ -1,4 +1,6 @@
; Prog8 definitions for the Text I/O and Screen routines for the Commodore-64
; All routines work with Screencode character encoding, except `print`, `chrout` and `input_chars`,
; these work with PETSCII encoding instead.
%import syslib
%import conv
@ -237,10 +239,10 @@ _scroll_screen ; scroll only the screen memory
}}
}
romsub $FFD2 = chrout(ubyte character @ A) ; for consistency. You can also use cbm.CHROUT directly ofcourse.
romsub $FFD2 = chrout(ubyte character @ A) ; for consistency. You can also use cbm.CHROUT directly ofcourse. Note: takes a PETSCII encoded character.
asmsub print (str text @ AY) clobbers(A,Y) {
; ---- print null terminated string from A/Y
; ---- print null terminated string, in PESCII encoding, from A/Y
; note: the compiler contains an optimization that will replace
; a call to this subroutine with a string argument of just one char,
; by just one call to cbm.CHROUT of that single char.
@ -426,7 +428,8 @@ asmsub print_w (word value @ AY) clobbers(A,X,Y) {
}
asmsub input_chars (uword buffer @ AY) clobbers(A) -> ubyte @ Y {
; ---- Input a string (max. 80 chars) from the keyboard. Returns length in Y. (string is terminated with a 0 byte as well)
; ---- Input a string (max. 80 chars) from the keyboard, in PETSCII encoding.
; Returns length in Y. (string is terminated with a 0 byte as well)
; It assumes the keyboard is selected as I/O channel!
%asm {{

9
compiler/res/prog8lib/cx16/textio.p8
View File

@ -1,4 +1,6 @@
; Prog8 definitions for the Text I/O and Screen routines for the CommanderX16
; All routines work with Screencode character encoding, except `print`, `chrout` and `input_chars`,
; these work with PETSCII encoding instead.
%import syslib
%import conv
@ -384,10 +386,10 @@ _nextline
}}
}
romsub $FFD2 = chrout(ubyte character @ A) ; for consistency. You can also use cbm.CHROUT directly ofcourse.
romsub $FFD2 = chrout(ubyte character @ A) ; for consistency. You can also use cbm.CHROUT directly ofcourse. Note: takes a PETSCII encoded character.
asmsub print (str text @ AY) clobbers(A,Y) {
; ---- print null terminated string from A/Y
; ---- print null terminated string, in PETSCII encoding, from A/Y
; note: the compiler contains an optimization that will replace
; a call to this subroutine with a string argument of just one char,
; by just one call to cbm.CHROUT of that single char.
@ -572,7 +574,8 @@ asmsub print_w (word value @ AY) clobbers(A,X,Y) {
}
asmsub input_chars (uword buffer @ AY) clobbers(A) -> ubyte @ Y {
; ---- Input a string (max. 80 chars) from the keyboard. Returns length in Y. (string is terminated with a 0 byte as well)
; ---- Input a string (max. 80 chars) from the keyboard, in PETSCII encoding.
; Returns length in Y. (string is terminated with a 0 byte as well)
; It assumes the keyboard is selected as I/O channel!
%asm {{

9
compiler/res/prog8lib/pet32/textio.p8
View File

@ -1,4 +1,6 @@
; Prog8 definitions for the Text I/O and Screen routines for the Commodore PET
; All routines work with Screencode character encoding, except `print`, `chrout` and `input_chars`,
; these work with PETSCII encoding instead.
%import syslib
%import conv
@ -139,10 +141,10 @@ asmsub scroll_down () clobbers(A,X) {
}}
}
romsub $FFD2 = chrout(ubyte character @ A) ; for consistency. You can also use cbm.CHROUT directly ofcourse.
romsub $FFD2 = chrout(ubyte character @ A) ; for consistency. You can also use cbm.CHROUT directly ofcourse. Note: takes a PETSCII encoded character.
asmsub print (str text @ AY) clobbers(A,Y) {
; ---- print null terminated string from A/Y
; ---- print null terminated string, in PETSCII encoding, from A/Y
; note: the compiler contains an optimization that will replace
; a call to this subroutine with a string argument of just one char,
; by just one call to cbm.CHROUT of that single char.
@ -328,7 +330,8 @@ asmsub print_w (word value @ AY) clobbers(A,X,Y) {
}
asmsub input_chars (uword buffer @ AY) clobbers(A) -> ubyte @ Y {
; ---- Input a string (max. 80 chars) from the keyboard. Returns length in Y. (string is terminated with a 0 byte as well)
; ---- Input a string (max. 80 chars) from the keyboard, in PETSCII encoding.
; Returns length in Y. (string is terminated with a 0 byte as well)
; It assumes the keyboard is selected as I/O channel!
%asm {{

6
docs/source/libraries.rst
View File

@ -155,6 +155,9 @@ dealing with text-based input and output (to the screen). Such as
- scrolling the text on the screen
- placing individual characters on the screen
All routines work with Screencode character encoding, except `print`, `chrout` and `input_chars`,
these work with PETSCII encoding instead.
Read the `source code <https://github.com/irmen/prog8/tree/master/compiler/res/prog8lib/cx16/textio.p8>`_
to see what's in there. (Note: slight variations for different compiler targets)
@ -418,6 +421,9 @@ but perhaps the provided ones can be of service too.
``mul16_last_upper () -> uword``
Fetches the upper 16 bits of the previous 16*16 bit multiplication.
To avoid corrupting the result, it is best performed immediately after the multiplication.
Note: It is only for the regular 6502 cpu multiplication routine.
It does not work for the verafx multiplication routines on the Commander X16!
These have a different way to obtain the upper 16 bits of the result: just read cx16.r0.
cx16logo