diff --git a/blk/753 b/blk/753
index 3d94270..69ac38b 100644
--- a/blk/753
+++ b/blk/753
@@ -1,12 +1,13 @@
 : OP1 CREATE C, DOES> C@ A, ;
 0xac OP1 LODSB,      0xfa OP1 CLI,       0xfb OP1 STI,
 0xf4 OP1 HLT,        0xfc OP1 CLD,       0xfd OP1 STD,
-( no argument, jumps with abs addrs are special )
+( no argument, jumps with relative addrs are special )
 0xeb OP1 JMPs,       0xe9 OP1 JMPn,      0x74 OP1 JZ,
 : MOVri, SWAP 0xb0 OR A, A, ;
 : MOVxi, SWAP 0xb8 OR A, SPLITB A, A, ;
 : MOVsx, 0x8e A, SWAP 3 LSHIFT OR 0xc0 OR A, ;
 : INT, 0xcd A, A, ;
 : JMPr, 0xff A, 7 AND 0xe0 OR A, ;
+: JMPf, ( seg off ) 0xea A, SPLITB A, A, SPLITB A, A, ;
 : OPrr CREATE C, DOES> C@ A, 3 LSHIFT OR 0xc0 OR A, ;
 0x31 OPrr XORxx,     0x08 OPrr ORrr,
diff --git a/blk/811 b/blk/811
index 9007b24..d6a1af9 100644
--- a/blk/811
+++ b/blk/811
@@ -2,9 +2,9 @@ H@ ORG ! 0x7c00 BIN( ! ( BIOS loads boot bin at 0x7c00 )
 JMPs, L1 FWRs ( start )
 ORG @ 0x25 + HERE ! ( bypass BPB )
 L1 FSET ( start )
-CLI, CLD, AX AX XORxx, DS AX MOVsx, ES AX MOVsx,
+CLI, CLD, AX 0x800 MOVxi, DS AX MOVsx, ES AX MOVsx,
 SS AX MOVsx, SP 0xffff MOVxi, STI,
 AH 2 MOVri, DX 0 MOVxi, CH 0 MOVri, CL 2 MOVri, AL 1 MOVri,
-BX 0x8000 MOVxi, 0x13 INT, ( read 2nd sector of boot floppy )
-BX JMPr,
+BX 0 MOVxi, 0x13 INT, ( read 2nd sector of boot floppy )
+0x800 0 JMPf,
 ORG @ 0x1fe + HERE ! 0x55 A, 0xaa A,
diff --git a/blk/812 b/blk/812
index a109fef..6c028e2 100644
--- a/blk/812
+++ b/blk/812
@@ -1,4 +1,4 @@
-H@ ORG ! 0x8000 BIN( !
+H@ ORG !
 JMPs, L1 FWRs ( start )
 L2 ( msg ) BSET ," Hello World!" 0 A,
 L1 FSET ( start )