diff --git a/blk/753 b/blk/753
index 535c12b..efe3268 100644
--- a/blk/753
+++ b/blk/753
@@ -8,7 +8,8 @@
 0xaf OP1 SCASW,      0xaa OP1 STOSB,     0xab OP1 STOSW,
 ( no argument, jumps with relative addrs are special )
 0xeb OP1 JMPs,       0xe9 OP1 JMPn,      0x74 OP1 JZ,
-0x75 OP1 JNZ,        0xe8 OP1 CALLn,
+0x75 OP1 JNZ,        0x72 OP1 JC,        0x73 OP1 JNC,
+0xe8 OP1 CALLn,
 
 : OP1r CREATE C, DOES> C@ + A, ;
 0x40 OP1r INCx,      0x48 OP1r DECx,
diff --git a/blk/757 b/blk/757
index 19337f7..63f1800 100644
--- a/blk/757
+++ b/blk/757
@@ -1,5 +1,6 @@
 : OPrm CREATE C, DOES> C@ A, SWAP 3 LSHIFT OR A, ;
 0x8a OPrm MOVr[],    0x8b OPrm MOVx[],
+0x3a OPrm CMPr[],    0x3b OPrm CMPx[],
 
 : OPmr CREATE C, DOES> C@ A, 3 LSHIFT OR A, ;
 0x88 OPmr MOV[]r,    0x89 OPmr MOV[]x,
diff --git a/blk/759 b/blk/759
index 3ff2e8b..5625538 100644
--- a/blk/759
+++ b/blk/759
@@ -6,8 +6,8 @@
 : FJR, PC 0 A, ;
 : IFZ, JNZ, FJR, ;
 : IFNZ, JZ, FJR, ;
-( : IFC, JRNC, FJR, ;
-: IFNC, JRC, FJR, ; )
+: IFC, JNC, FJR, ;
+: IFNC, JC, FJR, ;
 : THEN,
     DUP PC          ( l l pc )
     -^ 1-           ( l off )
diff --git a/blk/761 b/blk/761
index 7c8c317..bedee06 100644
--- a/blk/761
+++ b/blk/761
@@ -1,3 +1,4 @@
+: PUSHZ, CX 0 MOVxI, IFZ, CX INCx, THEN, CX PUSHx, ;
 : CODE ( same as CREATE, but with native word )
     (entry) 0 ( native ) C, ;
 : ;CODE JMPn, 0x1a ( next ) RPCn, ;
diff --git a/blk/824 b/blk/824
index 56ebf50..f20a463 100644
--- a/blk/824
+++ b/blk/824
@@ -1,11 +1,11 @@
-CODE 0 AX AX XORxx, AX PUSHx, ;CODE
-CODE 1 AX 1 MOVxI, AX PUSHx, ;CODE
+CODE ! DI POPx, AX POPx, [DI] AX MOV[]x, ;CODE
+CODE @ DI POPx, AX [DI] MOVx[], AX PUSHx, ;CODE
+CODE C! DI POPx, AX POPx, [DI] AX MOV[]r, ;CODE
+CODE C@
+    DI POPx, AH AH XORrr, AL [DI] MOVr[], AX PUSHx, ;CODE
 CODE I [BP] 0 PUSH[w]+, ;CODE
-CODE 1+ DI SP MOVxx, [DI] INC[w], ;CODE
-CODE 1- DI SP MOVxx, [DI] DEC[w], ;CODE
+CODE I' [BP] -2 PUSH[w]+, ;CODE
+CODE J [BP] -4 PUSH[w]+, ;CODE
+CODE (resSP) SP PS_ADDR MOVxI, ;CODE
+CODE (resRS) BP RS_ADDR MOVxI, ;CODE
 CODE BYE BEGIN, JMPs, AGAIN, ;CODE
-CODE EMIT
-    AX POPx, AH 0x0e MOVri, ( print char ) 0x10 INT,
-;CODE
-: FOO 42 10 /MOD '0' + EMIT '0' + EMIT ;
-: BOOT ['] FOO EXECUTE BYE ;
diff --git a/blk/825 b/blk/825
new file mode 100644
index 0000000..d08a9cb
--- /dev/null
+++ b/blk/825
@@ -0,0 +1,15 @@
+CODE S=
+    SI POPx, DI POPx, CH CH XORrr, CL [SI] MOVr[],
+    CL [DI] CMPr[],
+    IFZ, ( same size? )
+        SI INCx, DI INCx, CLD, REPZ, CMPSB,
+    THEN,
+    PUSHZ,
+;CODE
+CODE CMP
+    BX POPx, AX POPx, CX CX XORxx, AX BX CMPxx,
+    IFNZ, ( < or > )
+        CX INCx, IFNC, ( < ) CX DECx, CX DECx, THEN,
+    THEN,
+    CX PUSHx,
+;CODE
diff --git a/blk/826 b/blk/826
new file mode 100644
index 0000000..0377038
--- /dev/null
+++ b/blk/826
@@ -0,0 +1,8 @@
+CODE 0 AX AX XORxx, AX PUSHx, ;CODE
+CODE 1 AX 1 MOVxI, AX PUSHx, ;CODE
+CODE 1+ DI SP MOVxx, [DI] INC[w], ;CODE
+CODE 1- DI SP MOVxx, [DI] DEC[w], ;CODE
+CODE EMIT
+    AX POPx, AH 0x0e MOVri, ( print char ) 0x10 INT,
+;CODE
+: BOOT 4 5 CMP '=' + EMIT ;
diff --git a/recipes/pcat/xcomp.fs b/recipes/pcat/xcomp.fs
index e9cc40e..c89f527 100644
--- a/recipes/pcat/xcomp.fs
+++ b/recipes/pcat/xcomp.fs
@@ -3,7 +3,7 @@
 750 LOAD  ( 8086 asm )
 262 LOAD  ( xcomp )
 270 LOAD  ( xcomp overrides )
-812 824 LOADR
+812 826 LOADR
 (entry) _
 ( Update LATEST )
 PC ORG @ 8 + !