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Standard IO for the linker is included by assembler directives in Blink3.a, when it is assembled with a positive machine option k=#. In the case of the NeXT, these are:
    .SYNO IONAM=/usr/IOst/IOst.a
When the machine option is negative, k=-#, the .REXT directive is skipped, and the linker object file is intended to be run with the loader, Ldo, whose standard IO acts as a local surrogate for that missing in the linker. This is important for cross building, because it allows a linker object file made on the host with a foreign machine option to be run with Ldo on the host to link object files into executables for the foreign machine, including foreign standard IO. See Command Files below for some examples that cross build the linker itself. All of the source files used by the systems in this distribution to build the linker, Blink3.a, Conv.a, and Arch9.a, include .DIRECT 2_, so cross builds can be done on systems with the Motorola 68000 cpu.
Blink3.a 14Nov15 17:02:50EST 75K Block linker.
Conv.a 16Jul15 15:48:19EDT 47K Convert UNIX object code to block object code.
Extract file from library:
Arch0.a 16Jul15 15:48:15EDT 1.3K     Dummy
Arch1.a 16Jul15 15:48:15EDT 9.1K     Charles River Data Systems Unos
Arch4.a 16Jul15 15:48:15EDT 6.1K     Torch Unisoft
Arch5.a 16Jul15 15:48:16EDT 7.0K     Hewlett Packard
Arch6.a 16Jul15 15:48:16EDT 6.7K     Motorola Unix System V
Arch7.a 16Jul15 15:48:16EDT 6.1K     AT&T
Arch9.a 16Jul15 15:48:16EDT 6.1K     Minimum, Amiga, Macintosh, NeXT, maybe Atari.
Arch10.a 16Jul15 15:48:15EDT 6.1K     Sun

Command Files

These command files for building the linker are based on the Veltman originals, but use a different naming system. For machine option #, Link#.y is an object file to be used with Ldo for cross building or debugging, Link# is an executable built on machine # with the command file L#.s, and Link#c is an executable cross built with L#c.s on some other machine. The production executable is to be renamed as Link.
L15.s 16Jul15 15:48:19EDT 182 Link15 executable for NeXT.
Lyc.s 16Jul15 15:48:20EDT 185 /usr/lib/Link#.y for cross builds with Ldo, for systems that use Arch9.a.
L14c.s 16Jul15 15:48:19EDT 227 Link14c executable for Macintosh.
L15c.s 16Jul15 15:48:19EDT 205 Link15c executable for NeXT.

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