Real Memory by Chatter /code/hardware/memory/realmem.zip	10 Jan 1997 (catalog date) 10,850 bytes
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Supposedly gets you past the 64k barrier in real mode - I have no clue what compiler this is supposed to compile for. It uses opcodes not allowed in BC's inline assembler, watcom doesn't use that kind of inline assembler (and doesn't need this extender anyway), and this is pointless for djgpp which only compiles 32bit pmode apps. I have neither TC (but considering that's a sub-set of BC I can assume it won't work) nor Quick C (but that's so old, it's inline assembler's probably incomplete too).

Xi Development System by Fysx /code/hardware/pmode/xids0815.zip	19 Jan 1998 (catalog date) 43,131 bytes
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Xi Development System, a pmode extender. Uses tlink in the end, but works from watcom and tasm. Possibly a contender if you're writing a 64k intro and need a pmode extender. I'm unsure of it's stability, but it's small.

Once 64k Intro by Laserdance of Acme /demos/1994/o/once_lsd.zip	29 Jun 1996 (catalog date) 87,894 bytes
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Released at event WIR94 in the in64 division and ranked 02

64k Waste by Brainless Coders /demos/1995/b/bc_64kb.zip	29 Jun 1996 (catalog date) 38,634 bytes
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Released at event JUH95B in the in64 division and ranked 04

Produktio 64k by Vandals /demos/1996/p/prdto64k.zip	07 Feb 1997 (catalog date) 67,111 bytes
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Released at event TP96 in the in64 division and ranked 23 P5,GUS,8MB

Slize by Wild Designs /demos/1997/0-9/64kslice.zip	18 Dec 1997 (catalog date) 63,081 bytes
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Released at event DH97 in the in64 division and ranked ??

Shaiza by Arc /demos/1997/a/arc-64k.zip	13 Sep 1997 (catalog date) 13,065 bytes
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Released at event ANT97 in the in64 division and ranked 05

64k Intro by Obscure /demos/1997/o/obs_tro.zip	26 Jul 1997 (catalog date) 64,529 bytes
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Released at event I97 in the in64 division and ranked 05

Wanda in 64k by Byteam /demos/1998/w/wanda5.zip	07 Mar 1998 (catalog date) 66,343 bytes
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Released at event FLAG98 in the in64 division and ranked 02

Shadow Lady by Junta /graphics/images/1997/j/jnt_shld.zip	17 Jun 1997 (catalog date) 137,959 bytes
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460x480x64k

Borozo by Florez of Nop /graphics/images/1998/b/borozo.zip	07 Apr 1998 (catalog date) 405,197 bytes
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Released at event CACH98 in the grtc division and ranked 02 640x480x64k