Cloud CP/M

Jumping Jack

Drive N : User 0 • by productiondave

Created 2026-05-04 • Updated 2026-05-04GitHub

A NABU Clone of the Jumping Jack game from the ZX Spectrum.

JJACK.COM program is located on the N: drive in user area 0. To run this, look in the Internet Adapter or Headless menu and select Cloud CPM. After CPM loads and you are presented with a A:0> prompt, type the drive (N:), and then type the user area (user 0). If you type DIR, look for the COM file (JJACK.COM). Enter that filename at the prompt to execute the Jumping Jack.

; 'JUMPING JACK' (ZX SPECTRUM) - DISASSEMBLY

; Chris Ward, 2012 (cjw116@googlemail.com)

; Original game (c) 1983 Imagine Software

; NABU Port (c) 2025 productiondave

This is a joystick only game. You need to jump through the gaps in the floors without hitting your head. Make it to the top and you win. Fall through a gap or bump your head and you are stunned for a moment. This increases your chances of falling through another gap.

Fall to the floor and you loose a life.

While this game sounds simple, it can be very very frustrating.

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