0002 0076 Colorboard 8 24S Specification Rev C1

COLORBOARD 8/24S Specification Revision C1 May 9,1990 Jeff Tingley RasterOps Corporation PART# 0002-0076 8/24SSpecification 1.0 May 21, 1990 Introduction This document establishes the physical and electrical characteristics for the ColorBoard 8/248 System. ColorBoard 8/248, referred to as 8/248 throughout the rest of this document, is a medium resolution, high speed, graphics display system for the Macintosh II, llX, and llCX. The 8/248 occupies 1 Nubus slot. It is capable of five pixel depths and supports interlaced and non-interlaced monitors. A block diagram of the 8/248 is shown in figure 1-1. This document is the property of RasterOps Corporation and is confidential. Reproduction of this document is prohibited. r"". NU BUS ISOLATIO N ~ BUFFERS ~ ADl31.:lll. I"15-PIN DSUB '-"' CONTROL &CLOCKS - r-- NUBUSAND FRAt.E BUFFER CONTROLLING ASIC (NBSC) l CONFIG. ROM (18BITS WIDE) ROM ADD.BUS BT473 RAMDAC ROM ADD. BUS DAC~ r'°"i. RED GREEN BLUE ~ REDDATA GREEN DATA BLUE DATA ROWICOL ADDA. E FRAM BUFFER 1024 512 24 x x PIXEL ....... UNPACKING ASIC ..BED. (VBEC) r.Rl:'l:'l\I .Bl LIE. RED, GREEN, AND BLUE SERIAL DATA ~ClOCK~~] 30.24MHZOR 12.3356 MHZ Figure 1-1 8/248 Block Diagram 2 B/24SSpecification 2.0 May 21, 1990 Hardware Description 2.1 Features Switchable Resolutions of -640 x 480 - 640 x 480 x 30Hz (NTSC Frequencies) - 640 x 480 x 25Hz (PAL Frequencies) Pixel Depths of 1, 2, 4, 8, 24-Bits - 24-Bit Mode is Full Chunky Macintosh II "FAT" and "Skinny" NuBus Compatible 16.7 Million Color Palettes 30.24, 12.3356 MHz and 14.25 MHz (PAL) Video Rates External Genlock capablity Single NuBus Slot Current Consumption of 0.90 Amps at 5 Volts 300 nS Cycle for 24-Bit Pixels RS-343 Compatible 15-Pin D-Submininature Connector (Same as Apple) State of the Art Surface Mount Technology Including two ASICs Supports Nubus Block Mode User Expandable from 8 to 24 Bit Color 2.2 Overview The 8/24S's function is to provide a inexpensive 24-bit solution for the Macintosh user. The 8/24S supports all pixel depths the user could ever need, from 1-Bit for speedy drawing all the way up to 24-Bit for true color reproduction. Added feature include full support of block mode transfers 3 8124SSpecification May 21, 1990 over the Nubus ™and NTSC and PAL frequency compatibility. 3.0 Technical Data 3.1. Absolute Maximum Ratings Supply Voltage, VCC ............................................................... 5.25 Volts Operating Ambient Temperature Range .............................. O°C to 60 °C Storage Temperature ................... .... ................... ........ .... .. .... . -65 °c to 150 °c ICC (Supply Current) ............................................................... 1.5 A @ 5.25 V 3.2 Reference Drawings The following items should be referenced for detailed information on the 8/24S system. 8/24S Top Assembly LM ....................... 8/24S 8/24S Top Assembly Drawing ............ 0002-0066 8/24S Assembly Drawing ......…