Data East, Sega, and late-model Stern Display ROM Jumper Info
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 Data East, Sega, and late-model Stern Display ROM Jumper Info
Many of the Technical Articles on our site contain information and directions involving electronics and circuit board repair. They are authored with the assumption that the reader has adequate experience and knowledge required to do the work being described. If you do not feel qualified, or are in any way uncomfortable doing any of the work described in any of the articles, then we strongly recommend enlisting the help of a qualified repair person or shop who can do the work for you. It may save you cost, time, and further repair work. We (Action Pinball & Amusement, LLC) are not responsible for any damage to you, your game, or your property, from doing any work on your game related to any of the articles listed on this site.
Some Data East, Sega, and late-model Stern pinball games shipped from the factory with either a 1-chip setup, or a 2-chip setup, for ROM chips, on the display driver board. The 1-chip setup consists of only 1 display ROM chip installed at location ROM0 (U12). The 2-chip setup consists of 2 display ROM chips installed at locations ROM0 (U12) and ROM1 (U14). See image below for example. If you are ordering replacement or upgrade display ROM chip(s) for your game, it's best to order according to the setup that your game currently has on the display driver board (1-chip setup, or 2-chip setup). It is possible to modify your display driver board to change it from using a 1-chip setup to a 2-chip setup (or vice-versa):
A jumper is basically just a wire that connects two points on the board. The points are labeled on the PC board- label is usually located inbetween the two points, or dotted lines will outline the two points as labeled. The jumper may be just a simple bare wire, or a wire with white ceramic around the middle of it, or may look like a resistor with 1 black stripe. For more details on jumpers and replacing/installing them, see our related Tech Article on Williams games by clicking here.  Programming your own? When combining the data from both chips into a single chip, data from ROM 1 (U14) is written into the lower half of memory in the single chip, and data from ROM 0 (U12) is written into the upper half of memory. If you're uncomfortable doing this kind of work, we recommend leaving it to someone who is experienced. If you know which jumper needs to be set or removed, and don't know a local electronics technician, try taking the board to a local TV/VCR repair shop- they can do the work in a minute or two and may only charge $5 or $10. |
