The computer desk in my home is the pedestal/electronics cab from an IBM 3215 console/printer that was attached to an IBM 370/145 from 1971. The cabinet still contains the 8 inch diskette drive used for microcode/diagnostics loading. The diskette drive weighs about 40 kg has a 1/4 horsepower motor.
What I really want is the calligraphic display CRT from a 370/168 console or therabouts. Looks better than any dot matrix.
The loadall instruction did not switch the processor from protected mode to real mode. Loadall did just what it said: it loaded all the cpu registers, including the segment descriptor cache registers, from a fixed block of low memory. In real mode, you could use loadall to point the segment registers anywhere in the 24 bit physical address space of the 286.
Loadall was a faster alternative than switching to protected mode for copying memory to/from addresses beyond the 1M+64K area, and executing a processor reset through the A20 address line hack of the PC/AT platform.
Microsoft specifically left the loadall address block empty from at least DOS 3.3 version on.
Here's the dope for the x86 archeologists: http://www.x86.org/articles/loadal l/tspec_a3_doc.h tm
Hire a Soyuz TMA to ferry the repair crew and a Progress to haul the upgrade/repair parts up to the HST. Get the whole thing fixed up for $100M, tops. Who says the Shuttle's robot arm is required to fix a satellite, anyway?
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The computer desk in my home is the pedestal/electronics cab from an IBM 3215 console/printer that was attached to an IBM 370/145 from 1971. The cabinet still contains the 8 inch diskette drive used for microcode/diagnostics loading. The diskette drive weighs about 40 kg has a 1/4 horsepower motor. What I really want is the calligraphic display CRT from a 370/168 console or therabouts. Looks better than any dot matrix.
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The loadall instruction did not switch the processor from protected mode to real mode. Loadall did just what it said: it loaded all the cpu registers, including the segment descriptor cache registers, from a fixed block of low memory. In real mode, you could use loadall to point the segment registers anywhere in the 24 bit physical address space of the 286.
l l/tspec_a3_doc.h tm
Loadall was a faster alternative than switching to protected mode for copying memory to/from addresses beyond the 1M+64K area, and executing a processor reset through the A20 address line hack of the PC/AT platform.
Microsoft specifically left the loadall address block empty from at least DOS 3.3 version on.
Here's the dope for the x86 archeologists:
http://www.x86.org/articles/loada
Hire a Soyuz TMA to ferry the repair crew and a Progress to haul the upgrade/repair parts up to the HST. Get the whole thing fixed up for $100M, tops. Who says the Shuttle's robot arm is required to fix a satellite, anyway?