R32V2020 Memory Mapped Character Display

Description

• XGA
  • 800x600 resolution
• 2KB memory space
• 64 characters per row (6 bits)
• 32 rows (5 bits)

Memory Map

<img src="https://github.com/douggilliland/R32V2020/raw/master/Architecture/Memory%20Maps/MemoryMappedDisplay.PNG"></img>

Resources

• Character ROM - implemented in logic
  • 256 characters
• Total logic elements: 816
• Total registers: 23
• Total pins: 20
• Total memory bits: 16,384
• Embedded Multiplier 9-bit elements: 0
• Total PLLs: 1

ASCII Table

<img src="https://www.asciitable.com/index/asciifull.gif"></img>

Extended Character Set Bitmaps

• Characters below are from the Ohio Scientific C1P Manual
• Grant Searle used the UK101 character font
• Differences noted in red

<img src="https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6502/OSI/docs/Character_Set_US/Chars_0x00_0x1f.PNG"></img>

<img src="https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6502/OSI/docs/Character_Set_US/Chars_0x80_0xA0.PNG"></img>

<img src="https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6502/OSI/docs/Character_Set_US/Chars_0xA1_0xC3.PNG"></img>

<img src="https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6502/OSI/docs/Character_Set_US/Chars_0xC4_0xCA.PNG"></img>

<img src="https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6502/OSI/docs/Character_Set_US/Chars_0xCB_0xED.PNG"></img>

<img src="https://raw.githubusercontent.com/douggilliland/Retro-Computers/master/6502/OSI/docs/Character_Set_US/Chars_0xEE_0xFF.PNG"></img>