There’s a wealth of retro machines out there that cater to this. A sample: https://www.olimex.com/Products/Retro-Computers/Neo6502/open-source-hardware https://

There’s a wealth of retro machines out there that cater to this. A sample: https://www.olimex.com/Products/Retro-Computers/Neo6502/open-source-hardware https://www.olimex.com/Products/Retro-Computers/Neo6502/open... https://www.olimex.com/Products/Retro-Computers/AgonLight2/open-source-hardware https://www.olimex.com/Products/Retro-Computers/AgonLight2/o... Or with keyboards: https://wildbitscomputing.com/ https://wildbitscomputing.com/ https://www.kickstarter.com/projects/spectrumnext/zx-spectrum-next-issue-3-0 https://www.kickstarter.com/projects/spectrumnext/zx-spectru... Or you can go mobile: https://www.clockworkpi.com/product-page/picocalc https://www.clockworkpi.com/product-page/picocalc https://andywarburton.co.uk/post/gr3ml1n-a-compact-handheld-cyberdeck-built-for-chaos https://andywarburton.co.uk/post/gr3ml1n-a-compact-handheld-... And if you want a real challenge, the one euro computer: https://www.olimex.com/Products/Retro-Computers/RVPC/open-source-hardware https://www.olimex.com/Products/Retro-Computers/RVPC/open-so...