all repos — xyw @ 523f6dd495365a28d5d74a0b57a225170ce7dd4c

A minimal virtual machine and assembler for terminals.

Fixed examples to use HLT and RTS instructions properly.
h3rald h3rald@h3rald.com
Fri, 27 Feb 2026 17:52:57 +0100
commit

523f6dd495365a28d5d74a0b57a225170ce7dd4c

parent

646f057cb6472175f8030b4dcc8ecb45d8581cf1

8 files changed, 9 insertions(+), 22 deletions(-)

jump to
M examples/factorial16.xyw → examples/factorial16.xyw 
@@ -4,7 +4,7 @@ ; Main program: calculate and print factorial of 7
 $0007 fact JSRw 
 putdw JSRw
 NL
-end JMPw
+HLT
 
 ; Factorial subroutine
 ; a16 -[xy]-

@@ -29,5 +29,3 @@ PSHxw
     RTS
 
 .include "lib/putdw.xyw"
-
-.label end
M examples/factorial8.xyw → examples/factorial8.xyw 
@@ -4,7 +4,7 @@ ; Main program: calculate and print factorial of 5
 $05 fact JSRw 
 putd JSRw
 NL
-end JMPw
+HLT
 
 ; Factorial subroutine
 ; a8 -[xy]-

@@ -27,5 +27,3 @@ PSHx
     RTS
 
 .include "lib/putd.xyw"
-
-.label end
M examples/helloworld.xyw → examples/helloworld.xyw 
@@ -1,6 +1,6 @@ 
 ; main program
 hello print JSRw
-end JMPw
+HLT
 
 ; a16 --
 ; printing subroutine

@@ -19,4 +19,3 @@ 
 ; store null-terminated string
 .label hello
   .string "Hello, World!\n"
-.label end
M examples/korobeiniki.xyw → examples/korobeiniki.xyw 
@@ -27,7 +27,7 @@ $01 beeper.level STB
     ; Repeat unless we are at the end of the song
     PSHxw end-song LTHw play JCNw
     ; Terminate
-    $00 system.state STB
+    HLT
 
 .label start-song
M examples/on-error.xyw → examples/on-error.xyw 
@@ -5,7 +5,7 @@ on_error system.on_error STW
 
 ; Main program
 $10 $00 DIV
-end JMPw
+HLT
 
 ; on_error handler
 ; --

@@ -25,5 +25,3 @@ .label div-by-zero-error
   .string "Error: Division by zero.\n"
 .label unknown-error
   .string "Error: Unknown error.\n"
-
-.label end
M examples/print-args.xyw → examples/print-args.xyw 
@@ -3,7 +3,7 @@ 
 ; Set on_argument event handler
 print-args terminal.on_argument STW
 ; End program
-end JMPw
+HLT
 
 ; on_argument event handler
 ; -[x]-

@@ -24,5 +24,3 @@ ; Print new line
     .label print-args.end
         NL
         RTS
-
-.label end
M examples/print-stdin.xyw → examples/print-stdin.xyw 
@@ -3,7 +3,7 @@ 
 ; Set on_keypress event handler
 print-key terminal.on_keypress STW
 ; End program
-end JMPw
+HLT
 
 ; on_keypress event handler
 ; --

@@ -12,6 +12,4 @@ ; Print typed character
     terminal.input LDB PUTC
     ; Print new line
     NL
-    BRK
-
-.label end
+    RTS
M examples/time.xyw → examples/time.xyw 
@@ -3,7 +3,7 @@ 
 ; Main program
 print-clock JSRw
 set-timer JSRw
-end JMPw
+HLT
 
 .include "lib/putd.xyw"
 

@@ -49,5 +49,3 @@ RTS
   .label put-zero
     $30 PUTC
     put-digit JMPw
-
-.label end