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/*
ATDT MAGAZINE :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::[0x01-07]:
NUMERO 0x01::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
"algo sobre POKEs en Commodore 64" por [Hellraiser]
*/
Commodore 64... C64... "La 64"... no quiero divagar... no quiero explayarme
sobre mi primer homecomputer y mi favorita actual porque no termino mas
y hago un core dump cerebral.
Como sabemos (y como otras hc de la era) la preciosa (ven? no puedo con mi
genio!) C64 tiene BASIC (PET BASIC o CBM-BASIC) como sistema operativo
(basado en 6502 Microsoft BASIC) en su version 2.0.
BASIC cuenta con la instruccion POKE (entre tantas otras). POKE es una
instruccion que pone un valor de 8BITS en determinada posicion de memoria
del doble del valor (16BITS), lo cual nos permite cambiar el valor de
determinada instruccion en memoria.
+--------------+ ________/\\\\\\\\\____________/\\\\\____________/\\\____
|.------------.| _____/\\\////////_________/\\\\////___________/\\\\\____
|| BASIC 2.0 || ___/\\\/_______________/\\\///______________/\\\/\\\____
|| READY || __/\\\_______________/\\\\\\\\\\\_________/\\\/\/\\\____
|| || _\/\\\______________/\\\\///////\\\_____/\\\/__\/\\\____
|| || _\//\\\____________\/\\\______\//\\\__/\\\\\\\\\\\\\\\\_
|+------------+| __\///\\\__________\//\\\______/\\\__\///////////\\\//__
+-..--------..-+ ____\////\\\\\\\\\__\///\\\\\\\\\/_____________\/\\\____
.--------------. _______\/////////_____\/////////_______________\///_____
/ /============\ \
/ /==============\ \
/____________________\
\____________________/
En este brevisimo articulo voy a hacer un breve listado con POKEs utiles
que podran utilizar en sus aplicaciones BASIC para C64.
[EJEMPLO PRACTICO]
****************************************************
* Simplemente, se llama a la instruccion *
* con la siguiente sintaxis: *
* *
* > POKE <DIRECCION DE MEMORIA, VALOR> *
* *
* Ejemplo: *
* *
* > POKE 808, 239 *
* *
* Al ejecutarlo, lo que hara es desactivar la *
* tecla "RUN/STOP" de nuestro teclado. *
****************************************************
Sencillo, verdad? bueno, ahora a continuacion te hice una listita breve
de POKEs:
***************************************************************************
* DIRECCION DE MEMORIA/VALOR RESULTADO *
* *
* 649,0 -Desactiva el teclado *
* 53272,21 -Caracteres en mayusculas *
* 53272,23 -Caracteres en minusculas *
* 53280,0 al 15 -Cambia color del borde de pantalla *
* 53281,0 al 15 -Cambia color del fondo de pantalla *
* 646,0 al 15 -Cambia color del cursor *
* 808,239 -Desactiva la tecla RUN/STOP *
* 792,193 -Desactiva la tecla RESTORE *
* 53265,11 -Apaga la pantalla *
* 53265,27 -Enciende la pantalla *
* 56341,0-255 -Cambia la velocidad del cursor *
* 775,168 -Desactiva el comando LIST *
* 775.167 -Activa el comando LIST *
* *
***************************************************************************
La lista, tal cual adverti, es escueta por demas. Hay MUCHO para hacer con
POKE para manipular nuestra bella C=
En estos links pueden ver una lista aun mas amplia de POKEs y PEEKs:
$ lynx https://ready64.org/articoli/_files/043_pokesc64.txt
$ lynx https://archive.org/stream/peeks-and-pokes-for-the-commodore-64/
PeeksAndPokesForTheCommodore64_djvu.txt
Sos un entusiasta de Commodore como yo? te invito al grupo de Facebook
de Commodore Argentina:
$ lynx https://www.facebook.com/groups/Commodore64Arg/
nos l33mos pront0!
##################
## [Hellraiser] ##
##################
# shutdown -p now
_________________________________________________________________________________
!EOF -> atdt-zine-0x01-07.txt
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