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MZ 18 slot processor box with up to 3 mindless terminals connected.  5MB or 10MB hard disk would fit in processor box with the top box used only in a 40MB system.
2  Flashwriter 4 pcbs

2  64K ram pcbs

ZCB

1 64K system ram pcb

FD/HD controller

Bitstreamer 2 pcb
This box is actually from  a 5032E multi user system where the 8 inch Quantum 40 mb hard disk (see below) is mounted in another MZ box in place of the S100 slot.  In the 5005E system the 5 mb (10mb in 5010E system) hard disk is mounted in the space beside the floppy drive and just  forward of the transformer in the psu.
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Quantum  8 inch  40 MB hard disk
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MT5  Mindless Terminals

Cutout slot allowed cables from the pcbs to be routed out to NEC printers or to the external drive or tape unit.