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added notes to textio about PETSCII vs Screencode encoding.

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Irmen de Jong
2023-11-06 23:18:24 +01:00
parent ee2888e744
commit 4de012fc49
5 changed files with 30 additions and 12 deletions
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9
compiler/res/prog8lib/c128/textio.p8
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@@ -1,4 +1,6 @@
; Prog8 definitions for the Text I/O and Screen routines for the Commodore-128 ; 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 syslib
%import conv %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) { 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 ; note: the compiler contains an optimization that will replace
; a call to this subroutine with a string argument of just one char, ; a call to this subroutine with a string argument of just one char,
; by just one call to cbm.CHROUT of that single 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 { 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! ; It assumes the keyboard is selected as I/O channel!
%asm {{ %asm {{

9
compiler/res/prog8lib/c64/textio.p8
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@@ -1,4 +1,6 @@
; Prog8 definitions for the Text I/O and Screen routines for the Commodore-64 ; 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 syslib
%import conv %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) { 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 ; note: the compiler contains an optimization that will replace
; a call to this subroutine with a string argument of just one char, ; a call to this subroutine with a string argument of just one char,
; by just one call to cbm.CHROUT of that single 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 { 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! ; It assumes the keyboard is selected as I/O channel!
%asm {{ %asm {{

9
compiler/res/prog8lib/cx16/textio.p8
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@@ -1,4 +1,6 @@
; Prog8 definitions for the Text I/O and Screen routines for the CommanderX16 ; 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 syslib
%import conv %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) { 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 ; note: the compiler contains an optimization that will replace
; a call to this subroutine with a string argument of just one char, ; a call to this subroutine with a string argument of just one char,
; by just one call to cbm.CHROUT of that single 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 { 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! ; It assumes the keyboard is selected as I/O channel!
%asm {{ %asm {{

9
compiler/res/prog8lib/pet32/textio.p8
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@@ -1,4 +1,6 @@
; Prog8 definitions for the Text I/O and Screen routines for the Commodore PET ; 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 syslib
%import conv %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) { 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 ; note: the compiler contains an optimization that will replace
; a call to this subroutine with a string argument of just one char, ; a call to this subroutine with a string argument of just one char,
; by just one call to cbm.CHROUT of that single 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 { 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! ; It assumes the keyboard is selected as I/O channel!
%asm {{ %asm {{

6
docs/source/libraries.rst
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@@ -155,6 +155,9 @@ dealing with text-based input and output (to the screen). Such as
- scrolling the text on the screen - scrolling the text on the screen
- placing individual characters 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>`_ 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) 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`` ``mul16_last_upper () -> uword``
Fetches the upper 16 bits of the previous 16*16 bit multiplication. 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. 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 cx16logo