#2000

... selected memory. Here is how the 68000 moves 200,000 bytes from location 100,000 to location 1,250,000 (all decimal numbers): 203C 0003 0D40 MOVE .L #200000, D0 set byte count 207C 0001 86A0 MOVE .L #100000, A0 set source address 227C 0013 12D0 MOVE .L #1250000, A1 set destination address MOVEN 12D8 MOVE .B (A0)+, (A1)+ move a byte 5380 SUBQ .L #1, D0 decrement byte counter 66FA BNE MOVEN repeat until count done Three instructions to set up, three to execute (if the byte number were always even or divisible by 4, word or long word moves could be used). Now, try THAT using a segmented or bank switched memory system! Page 8 INTERESTING PUBLICATIONS ...

... iente linea hemos bloqueado el resto de los acceso a nuestra ip. Que hubiera pasado si la regla 3000 que puse de ejemplo estuviera antes que la regla #2000 ? pues algo simple, nadie podria entablar comunicacion con ese puerto de nuestra pc, ni siquiera nuestro servidor secundario. Recuerda que en la mayoria de los firewalls, al concordar un paquete con una regla que tengamos, inmediatamente se procede a ejecutar las acciones, es decir bloquear la conexion. Un ultimo ejemplo con varios puertos: # ipfw add 60000 deny tcp from any to myserver.org 21,22,23 Con esta linea, estamos bloqueando cualquier intento de accesar a nuestro server en los servicio ...

... Denoted as xyc, this mode allows the programmer to quickly move areas of memory from one bank to another. An example will prove helpful: a2 00 20 ldx #2000 a0 00 30 ldy $3000 a9 ff 0f lda $0fff 44 02 01 mvn $01,$02 Basically, we are moving $1000 bytes from $012000 to $123000. The X register holds the offset into the source bank; the Y register holds the offset into the destination bank. The accumulator holds the number of bytes to move MINUS 1. Remember that. The opcode Move Negative (MVN) takes the source bank and the destination bank as operands. The only opcodes that utilize this mode are MVN and Move Positive (MVP). MVP assumes the X and Y reg ...