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Continuing discussion from here. There are 86/186 CPUs that support 24/29-bit addressing without using protected mode.
- 24-bit addressing mode allowing for up to a 16Mbyte address space:
- NEC V33/V53 (186 supporting also the real mode features of 286) - extended addressing mode via
BRKXA/RETXAinstructions - NEV V55 - extended segment registers
- VAutomation Turbo86/186 1,2 - extended real mode (OpenWatcom)
- F8680 SuperState R via which can also be emulated the 286 features (including HMA and 16-bit protected mode for Win3.1)
- NEC V33/V53 (186 supporting also the real mode features of 286) - extended addressing mode via
- 29-bit addressing mode, 32 registers, VMZ instructions (kind of "32-bit protected mode competitor/alternative"): VM8600SP - 8086 supporting some 286/386 instructions
Are those something that ELKS can support?
Another interesting platform is providing full 1MB access - maybe that's more relevant for TLVC:
- SCP-300 with PHANTOM signal (disabling the BIOS after boot-up - p45) - allowing to perform "linking the linker" like Microsoft did before 386 was available.
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