3 Wait Logic

When reading or writing to GI Sound Chip U19, the Z80 must wait for one Time State, or T-State. For circuit simplicity, a signal generated by U25-6 determines when these states need to be inserted. Sometimes active for other reasons, this signal is always active low whenever the GI Sound Chip is addressed. The Wait Circuit for the GI Sound Chip is composed of U28 and U25, pins 1 through 6. A T-State is generated as follows The signal at U25-6 is fed to 028-2. U28 is configured as a 2-Bit shift...

Gi Scope Test Program

Problems with the GI sound may be traced to the signal level with the aid of this test program and an oscilloscope. Carefully follow the guidelines for troubleshooting outlined below. This troubleshooting procedure is dependent upon several assumptions 1.) The LAIR Test runs all tests up to, but not including, Test 50 GI Sound Test. 2.) The GI Sound Test has failed, leaving the specific problem undiscovered and unsolved. 3.) The original GI Sound Chip has been replaced by a GI Sound Chip that...

General Information For Operators

For safety and reliability, Cinematronics does not recommend or authorize any substitute parts or modifications of Cinematronics equipment. Such alterations may adversely affect game play, cause injury, or void Warranty. Subsitute parts, modifications, and non-Cinematronics game conversions may also void PCC compliance. Cinematronics' games are protected by Federal copyright, trademark, and patent laws. Therefore, non-Cinematronics game conversions or game modules may be illegal under Federal...

C Z80 Control Logic

This section describes the generation of three control inputs to the Z80 CLOCK , RESET-, and WAIT-. The control input Bus Request BUSRQ- may be wired on some boards, but it is never used. The Clock Circuit provides the Z80 Controller Board with a stable source of timing, thus insuring, among other things, that all audio sounds remain in tune. Composed of U24, U29, Yl, and other discrete parts, the Clock Circuit consists of an oscillator and several dividers and drivers. The oscillator is...