diff --git a/src/other/brt.s b/src/other/brt.s
new file mode 100644
index 0000000..1295ede
--- /dev/null
+++ b/src/other/brt.s
@@ -0,0 +1,286 @@
+" brt
+
+jmp start
+
+" syscalls:
+
+" .save: .+1
+" .getuid: .+1
+
+.open: .+1
+   s 2
+   n 8
+   n 7
+   lac sp i
+   dac 1f
+   isz sp
+   lac sp i
+   dac 2f
+   lac sp
+   tad d1
+   dac sp i
+   isz sp
+   sys open; 1:0; 2:0
+   dac sp i
+   isz sp
+   jmp fetch
+
+.read: .+1
+   s 2
+   n 8
+   n 7
+   lac sp i
+   dac t1
+   isz sp
+   lac sp i
+   dac 1f
+   isz sp
+   lac sp i
+   dac 2f
+   lac sp
+   tad d1
+   dac sp i
+   isz sp
+   lac t1
+   sys read; 1:0; 2:0
+   dac sp i
+   isz sp
+   jmp fetch
+
+.write: .+1
+   s 2
+   n 8
+   n 7
+   lac sp i
+   dac t1
+   isz sp
+   lac sp i
+   dac 1f
+   isz sp
+   lac sp i
+   dac 2f
+   lac sp
+   tad d1
+   dac sp i
+   isz sp
+   lac t1
+   sys write; 1:0; 2:0
+   dac sp i
+   isz sp
+   jmp fetch
+
+" .creat: .+1
+" .seek: .+1
+" .tell: .+1
+" .close: .+1
+" .link: .+1
+" .unlink: .+1
+" .setuid: .+1
+" .rename: .+1
+" .exit: .+1
+" .time: .+1
+" .intrp: .+1
+" .chdir: .+1
+" .chmod: .+1
+" .chown: .+1
+" .sysloc: .+1
+" .capt: .+1
+" .rele: .+1
+" .status: .+1
+" .smes: .+1
+" .rmes: .+1
+" .fork: .+1
+
+" library
+
+.array: .+1
+   s 2
+   n 8
+   n 7
+   -1
+   tad sp i
+   cma
+   tad lastv
+   dac lastv
+   lmq
+   lac sp
+   tad d1
+   dac sp i
+   isz sp
+   lacq
+   dac sp i
+   isz sp
+   jmp fetch
+
+.getchr: .+1
+   s 2
+   n 8
+   n 7
+   lac sp
+   tad d1
+   dac sp i
+   isz sp
+   jms getc
+   dac sp i
+   isz sp
+   jmp fetch
+
+.putchr: .+1
+   s 2
+   n 8
+   n 7
+   lac sp i
+   dac t1
+   lrss 9
+   jms putc
+   lac t1
+   jms putc
+   jmp fetch
+
+.flush: .+1
+   n 8
+   n 7
+   jms flush
+   jmp fetch
+
+getc: 0
+   lac iflg
+   dzm iflg
+   sza
+   jmp getc i
+   lac cibufp
+   sad eibufp
+   jmp 1f
+   lac cibufp i
+   and o777
+   dac iflg
+   lac cibufp i
+   isz cibufp
+   lrss 9
+   jmp getc i
+1:
+   lac .fin
+   sys read; ibufp: ..; 64
+   sna spa
+   jmp 1f
+   tad ibufp
+   dac eibufp
+   lac ibufp
+   dac cibufp
+   jmp getc+1
+1:
+   lac o4
+   jmp getc i
+
+putc: 0
+   and o777
+   sna
+   jmp putc i
+   lmq
+   lac oflg
+   sza
+   jmp 1f
+   lacq
+   alss 9
+   dac cobufp i
+   dac oflg
+   jmp putc i
+1:
+   lac cobufp i
+   omq
+   dac cobufp i
+   dac cobufp i
+   dzm oflg
+   isz cobufp
+   lac cobufp
+   sad eobufp
+   skp
+   jmp putc i
+   lac .fout
+   sys write; obufp: ..; 64
+   lac obufp
+   dac cobufp
+   jmp putc i
+
+stop:
+   jms flush
+   las
+   sma
+ sys exit   "   sys save
+   sys exit
+
+flush: 0
+   lac oflg
+   sza
+   isz cobufp
+   lac cobufp
+   cma
+   tad obufp
+   cma
+   sna
+   jmp flush i
+   dac 1f+1
+   lac obufp
+   dac 1f
+   lac .fout
+   sys write; 1: ..; ..
+   lac obufp
+   dac cobufp
+   dzm oflg
+   jmp flush i
+
+initio: 0
+   lac 017777 i
+   sad d4
+   jmp 2f
+   sad d8
+   jmp 1f
+
+   law 9
+   tad 017777
+   dac .+3
+   law 017
+   sys creat; ..
+   spa
+   jmp stop
+   dac .fout
+1:
+   law 5
+   tad 017777
+   dac .+2
+   sys open; ..; 0
+   spa
+   jmp stop
+   dac .fin
+2:
+   lac lastv
+   dac eibufp
+   dac cibufp
+   -64
+   tad lastv
+   dac lastv
+   dac ibufp
+   lac lastv
+   dac eobufp
+   -64
+   tad lastv
+   dac lastv
+   dac obufp
+   dac cobufp
+   dzm oflg
+   jmp initio i
+
+.argv: 0
+.fin: 0
+.fout: 1
+eibufp: 0
+cibufp: 0
+iflg: 0
+eobufp: 0
+cobufp: 0
+oflg: 0
+lastv: 017770
+
+o777: 0777
+d4:o4: 4
+d8: 8
\ No newline at end of file
diff --git a/src/other/test.b b/src/other/test.b
new file mode 100644
index 0000000..1997630
--- /dev/null
+++ b/src/other/test.b
@@ -0,0 +1,25 @@
+/* test.b - test program for B run-time library brt.s
+
+   b test.b test.s
+   echo abcABC > abc
+   perl as7 --out test.out brt.s test.s bi.s
+   perl a7out test.out
+*/
+
+main {
+  extrn fname, fin;
+  auto ch;
+  
+  fin = open(fname, 0);
+
+  goto loop;
+  while (ch != 04) {
+    putchr(ch);
+loop:
+    ch = getchr();
+  }
+  
+  flush();  
+}
+
+fname [] 'ab','c ','  ','  ';