TRS80 Hardware

Memory Map

• 0000-2FFF Level 2 ROM
• 3000-37DF Unused
• 37E0-37FF Memory Mapped I/O
• 3800-38FF Keyboard map
• 3900-3BFF (Keyboard map shadow)
• 3C00-3FFF 1KB Video RAM
• 4000-41FF RAM used by the ROM routines
• 4200-4FFF Usable RAM in a 4K machine
• 5000-7FFF Usable RAM in a 16K machine
• 8000-BFFF Additional RAM in a 32K machine
• C000-FFFF Still more RAM in a 48K machine

Start of user RAM for program storage: 42E9

RAM Use

0033	PrintChar	Print a character to the screen