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Gottlieb Q Bert Troubleshooting Instructions

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    Page 1 Page 1 of 4 TROUBLESHOOTING Q*BERT Reprinted from the Gottlieb “On Target” Newsletter March/April and May/June 1983. Foreground on the Gottlieb GG-III Video System is generated on a 16x16 pixel format. Foreground characters can be moved to any point on the CRT with each having its own priority scheme in relationship to the other foreground characters. The foreground characters consist of: The word Q*bert on the instruction frame, all moving characters, the large letters for highest score on the high...
    Page 2 Page 2 of 4 It is no secret that solid state hardware does sometimes become defective. It is for this reason that the accompanying table of symptom/possible causes can be helpful when troubleshooting the Gottlieb GG-III Logic Board. A note to remember - this list has been compiled to assist the technician in troubleshooting the Logic Board. The list of possible faults is not always definitive. The Intel 8088 microprocessor is a third generation microprocessor with an 8-bit data bus to memory and to I/O...
    Page 3 Page 3 of 4 (Write Control), pin 29, controls the read/write function of the system RAM as well as clocking the Output Port Flip Flops (A8, A9, A10). This is a general pin function description that can be utilized when troubleshooting the GG-III System. The other pins on the microprocessor are all self explanatory. FOREGROUND Foreground generation on the GG-III System is initiated with three foreground registers (E1-2, E2-3, E4) all addressed via the microprocessor through program control. These...
    Page 4 Page 4 of 4 parallel to serial shift registers (L4-5, L5-6, L6-7, L7-8). Every clock cycle the outputs of the four shift registers are checked for data. If any output data, a write enable pulse (K12, K13, K9) is generated allowing data to transfer to the Line Object Buffers. BACKGROUND The Background Character Registers (E7) data is copied into the Background Buffer RAM (E10- 11) during the first half of the vertical blanking time through DMA transfer (E9-10). Once the data is read by the Buffer RAM, the...
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