55 lines
1.7 KiB
Plaintext
55 lines
1.7 KiB
Plaintext
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Williams Electronics Y-Unit Video Hardware System
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-------------------------------------------------
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System Description
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Copyright (c) 1989 Williams Electronics Games, Inc.
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All Rights Reserved
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The Y-Unit video system is the successor to the Z-Unit
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system that was used in NARC (1989). The system is designed
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with cost reduction in mind, without taking away the tremendous
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horsepower of the Z-Unit. Based on the Texas Instruments
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TMS34010 Graphics System Processor, and a custom DMA, Williams
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has created the most powerful coin-operated video game hardware
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for the money. With its single board layout and JAMMA compatible
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edge connector, it is also competitive in the kit market.
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The major changes are as follows:
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1) Reduced image ROM storage from 8 Mb to 2 Mb.
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2) Reduced program ROM storage from 512K to 256K.
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3) Jumpers to accomodate contiguous storage of images
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at n bits/pixel.
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As an added cost savings measure, most games currently
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under development are using a resolution of 256x395x8 rather
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than 400x512x16. This drastically reduces the storage space
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required for images from ROM to Video RAM.
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The Y-Unit is theoretically the same as the previous
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system. The Z-Unit Theory and Maintenance Manual is a very
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comprehensive explanation of the ideas behind the hardware
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operation. Please refer to this if you wish to explore these
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ideas in depth. Included with this document is a system memory
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map and a description of the revision 1 DMA. For operation
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and programming of the TMS34010 refer to the TMS34010
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user's guide.
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