NEODIAG-80 Board

Twister Sound

Fast diagnosis board

For SYSTEM 80, 80A & 80B.


NEODIAG-80 is an electronic assembly for quick diagnosis and easy identification of CPU board SYSTEM-80, 80Aand 80B malfunctions. Its use is particularly recommended in case the CPU board does not start at all.

Photo of the prototype:

The objective is to detect failures from defective RIOT circuits (U4, U5 and U6) or RAM 5101 (Z5). These circuits are originally soldered, it is indeed very difficult to know which to replace without having a specific test equipment.

NeoDIAG-80 performs the internal test of these components and legibly indicates those that are defective, thanks to a 7-segment display.


The board connect to the TC1 connector on the CPU board as shown in the picture below:


NeodDIAG-80 uses a solidarity link, limiting the risk of manipulation. Much more reliable and durable than a cable, it is provided by two removable strips, easily replaceable in case of wear or breakage.

NeoDiag80 NeoDiag80


The implementation of the NeoDIAG-80 is very simple, there is no complicated manipulation to make use of it. Just choose the operating mode before connecting the NeoDIAG80 and possibly connect the grip to disable ROMs (only if they are soldered).

Two DIPs allow you to select one of four modes:

  • The main mode "Tst", which is that of the diagnosis.
  • The three "Run" modes, which reproduce the normal operation of a SYSTEM-80, 80A or 80B.

Diagnostic mode can detect faults in circuits U4, U5, U6 (RIOT) or Z5 (RAM 5101) without the need to disassemble them. It also makes it possible to quickly check the clock, reset or IRQ (interrupts) faults. The operation of the SLAM TILT and the TEST/PLAY button are also controlled, finally, the outputs of the connector A1J4 (piloting the driver board) are viewable.

So that NeoDIAG-80 remains simple to use, no test of the contact's matrix (with the exception of checking the TEST/PLAY button), configuration DIPs or displays are not integrated in this mode.

The other three modes allow the CPU board to work with a "standard" program corresponding to a "basic" pinball one of three systems (80, 80A and 80B). It is then possible to activate the original test mode, via the TEST/REPLAY button in order to control the rest of the board (subject to connecting external elements, such as, matrix of contacts, displays, etc ...).


This consists of a "user manual" describing the detailed operation and the procedures for implementing the product.

Download the documentation:


This achievement is available in our shop.


NEODIAG-80 is by its operational mode, very similar to the "historic" quickscan-80 (sometimes also called QS80) of Great Plain Electronics (GPE). However, the resemblance stops there. NEODIAG-80 uses its own software developed by FLIPPROJETS, which is very different from the one used by the QS-80. In addition, the new hardware design of the NEODIAG-80 makes it a more advanced successor than a simple quick-scan clone. To avoid any ambiguity, we have also named our product NEODIAG-80, which is far removed from the QUICKSCAN name. It is quite normal to find strong similarities between these two products, since their purpose is identical: the troubleshooting of Gottlieb SYSTEM-80 CPU boards. The quickscan is no longer produced since 2004, it was time 15 years later, to release a replacement card that can make the same service.

Last update of this page: December 11th, 2019

French Tech


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