MICROCHIP CRT8002B-032BI

The SMC CRT 8002 Video Display Attribute Controller (VDAC) is an N-channel COPLAMOS® MOS/LSI device utilizing CLASP® technology. It incorporates a 7×11×128 character generator ROM, wide graphics mode, thin graphics mode, external input mode, character address/data latches, field and/or character attribute logic, attribute latches, four cursor modes, two programmable blink rates, and a high-speed video shift register. The CRT 8002 VDAC™ is the companion chip to SMC's CRT 5027 VTAC. Together, these two chips provide the circuitry required for the display section of a CRT video terminal. The CRT 8002 video output can be directly connected to a CRT monitor video input. The CRT 5027 blanking output can be directly connected to the CRT 8002 retrace blanking input to provide horizontal and vertical retrace blanking of the video output. The CRT 8002 offers four cursor modes: underline, blinking underline, reverse video block, and blinking reverse video block. Any one of these can be mask-programmed as the cursor function. A separate cursor blink rate can be mask-programmed to provide blink rates from 15Hz to 1Hz. CRT 8002 attributes include reverse video, character blanking, blink, underline, and strikethrough. The character blink rate can be mask-programmed from 7.5Hz to 0.5Hz with a 75/25 duty cycle. Underline and strikethrough are similar but independently controlled functions; any number of raster lines can be set at any position within the character block via mask programming. These attributes are available in all modes. In wide graphics mode, the CRT 8002 generates a graphic entity the same size as the character block. This graphic entity contains 8 sections, each associated with one bit of a graphics byte, providing 256 unique graphic symbols. Thus, the CRT 8002 can generate either alphanumeric symbols or graphic entities depending on the selected mode. The mode can be changed on a character-by-character basis. Thin graphics mode enables users to create single-line drawings and forms. External mode enables users to expand the on-chip ROM character set and/or on-chip graphics capability by inserting external symbols. These external symbols can come from RAM, ROM, or PROM.

• On-chip character generator (mask-programmable), 128 characters (alphanumeric and graphic), 7×11 dot matrix block
• On-chip video shift register, maximum shift register frequency: 20MHz for CRT 8002A, 15MHz for CRT 8002B, 10MHz for CRT 8002C, access time 400ns
• On-chip horizontal and vertical retrace video blanking
• No step-down circuitry required
• Four operating modes (mixable)
• Internal character generator (ROM)
• Wide graphics
• Fine graphics
• External input (font/dot graphics)
• On-chip attribute logic — character, field reverse video, character blanking, character blink, underline, strikethrough
• Four on-chip cursor modes: underline, blinking underline, reverse video, blinking reverse video
• Programmable character blink rate
• Programmable cursor blink rate
• Subscript capable
• Expandable character set, external fonts, alphanumeric and graphic RAM, ROM, and PROM
• On-chip address buffer
• On-chip attribute buffer
• +5V operation
• TTL compatible
• MOS N-channel silicon gate COPLAMOS® process
• CLASP® technology — ROM and options
• Compatible with CRT 5027 VTAC®