80286 pricing and availability - Retrocomputing Stack Exchange
Jul 9, 2018 · The 80286 isn't that much harder, and of similar complexity to the 68020 which was a very popular choice for homebrewers. I'd pick the 80386 as the last mainstream processor that was …
How to switch an 80286 from protected to real mode?
Intel designed the 80286 to boot in real mode, use the basic hardware to things up, and then go into protected mode AND STAY THERE, NEVER TO COME OUT, unless power was cycled.
Were Windows 3.x applications dependent upon 80286 instructions?
Dec 19, 2022 · While Windows 3.x operating system stuck to the 80286 platform, did applications compiled for Windows 3.x have to use 80286 instructions explicitly or be aware of the 80286 memory …
80286 - How do you put a 286 in Protected Mode? - Retrocomputing …
The 80286 microprocessor adds one major programmer-visible feature to the 8086 protected mode operation. This text will not cover the 80286 protected mode of operation for a variety of reasons.
How does the LOADALL instruction on the 80286 work?
Jun 25, 2016 · 62 LOADALL is an undocumented instruction available on the 80286, 80386 and some 486 clones. It provides a means to load all the CPU's registers in one operation, including normally …
What's the heritage of 80286? - Retrocomputing Stack Exchange
Feb 19, 2021 · 80186 introduced some instructions for HLL features. 80286 introduced some instructions for protected mode, and provided some multitasking ability with external MMU which was …
80286 real mode emulator for 8086 - Retrocomputing Stack Exchange
Oct 27, 2019 · The simplest solution would to replace the 8088 CPU with a NEC V20 CPU, which is 80186 compatible, and so implements all the instructions added to the 80286 except those specific to …
x86 - Did any software attempt to perform 8086 emulation on the …
Feb 20, 2022 · The 80286 had a lot of shortcomings, such as not being able to switch back to Real Mode from Protected Mode (except by reset), but its PM environment wasn't that bad by itself. What …
80286 - BIOS support for 286 Protected Mode - Retrocomputing Stack …
Jun 19, 2024 · Did BIOS on 286 systems provide support for the Protected Mode? On a 386, the BIOS can be fairly easily accessed from protected mode using the Virtual 86 mode, but since 286 did not …
80286 - 0F1h opcode-prefix on i80286 - Retrocomputing Stack Exchange
Aug 12, 2019 · On Intel iAPX 80286, as I recall from experience, the undocumented – officially unassigned – opcode position 0F1h was actually decoded as an instruction prefix, thus counting for …