The weakest MSX ever, Casio PV-7 & Expansion unit KB-7.
PV-7 has 8k byte main RAM. Konami’s early titles ran on this weakest platform. It’s unbelievable nowadays.
PV-7 in this picture is docked on KB-7 expantion unit, and has 3 cartridge slots. Extend 16k RAMs are also embedded in KB-7.
PCB is so simple that you can trace electric circuit. You can find this is literally the simplest MSX, if you read PCB reffering to MSX document.
If you find this PV-7 or PV-16 (updated version of PV-7) I recommend to get one.
It’s very ideal design for MSX DIY hobbyist.