Horizon24

HaRivar Mercury 24 Specification Revision XA1 January 20, 1993 Jeff Tingley RasterOps Corporation PART # 0002-0499 CONFIDENTIAL Mercury 24 January 20, 1993 1.0 Introduction This document establishes the physical and electrical characteristics for the Mercury 24, The Mercury 24 is a high resolution, graphics display board for the Macintosh computer. The Mercury 24 occupies one NuBus slot in the Macintosh. It is capable of six pixel depths, multiple resolutions, and has a QuickDraw accelerator. The connectors for a MIPS co-processor or DSP based daughter board are also included. A block diagram of the Mercury 24 is shown in Figure 1-1. This document is the property of RasterOps. Reproduction of this document is prohibited. Video System Controller Synes RGS14188 8 (Venus) 3 Latched Address E § oo NuBus Interface $ (Earth) 3 2 NuBus Flash Eprom Le Mercury RGS90392 ColorBoard Data Bus a= [ NuBus Expansion ] } g [Ay 6 5 DRAM Array Display Memory L R-Bus Expansion | (Up to 256 MBytes) 1024 x 1024 x 32 BT9046-110 (4 MBytes) Clock Synthesizer Figure 1-1 Mercury 24 Block Diagram 2.0 Hardware Description 2.1 Features Switchable Resolutions of (Software Selectable stored in EEPROM or Monitor ID Selectable) - 1280 x 1024 (16-bit, 75 Hz Vertical Refresh, Non-interlaced) - 1152 x 870 (75 Hz Vertical Refresh, Non-interlaced) - 1024 x 768 (60,75 Hz Vertical Refresh, Non-interlaced) - 832 x 624 (75 Hz Vertical Refresh, Non-interlaced) - 640 x 870 (75 Hz Vertical Refresh, Non-interlaced) - 640 x 480 (66 Hz Vertical Refresh, Non-interlaced) Confidential Material 2 Mercury 24 January 20, 1993 Pixel Depths of 1, 2, 4, 8, 16, and 24-bits NuBus Block Mode Migst/Slave Compatible ~oe Yam acces) 134.2 Million Color Palette (9 bit DACs) Mercury based QuickDraw Accelerator RS-343 Video Compatible 15-Pin D-Submininature Connector (Same as Apple) Hardware Zoom of 1x, 2x, 3x... to 16x Smooth Pan independent of pixel depth 2.2 Overview The Mercury 24 is a stand alone frame buffer. It can display up to 24-bits per pixel in one of many resolutions. It is capable of integer zoom and implements smooth paning in all bit depths. The DACs are 9-bit instead of 8-bit to allow for gammas up to 2.4 without redundant colors. A Mercury based QuickDraw Accelerator is included for maximum performance. As an added feature, the Mercury 24 also supports an MIPS coprocessor or a DSP based daughter card. 3.0 Technical Data 3.1. Absolute Maximum Ratings Supply Voltage, VCC ......esesssssssesessssessesesssseeeseessesseeeeens 5.25 Volts Operating Ambient Temperature Range ...........:: 0 °C to 60 °C Storage Temperature ..........sscsscseeseees vee -65 °C to 150 °C ICC (Supply Current) 0... cessseesesssssssssssesesssesseseseeseseeeenees 40A @5.25V 3.2 Reference Drawings The following items should be referenced for information on the Mercury 24. Mercury 24 Top Assembly LM 2642 Mercury 24 Schematics 0002-0496-1 1 Mercury 24 PCB Fab 0002-0497 Mercury 24 PCA 0002-0498-10 Mercu…