Category:84PCE:General Hardware Information

The TI-84 Plus CE and TI-83 Premium are two models new in 2015. The former is for the USA region (maybe all of North American?) and the latter is for France. The hardware is virtually identical between the two models.

Known hardware facts:

• eZ80 CPU
  • Physical clock speed believed to be 48 MHz
  • Effective clock speed between 12-15 MHz
  • CPU might be clocked faster but have a lot of wait states
• 4 MB flash chip
  • Bottom-boot organization this time
• 256 K main RAM
• Memory-mapped LCD
  • 153600 bytes of VRAM confirmed, unknown if more exists
  • Possibly an ARM Primecell PL111
• French version has testing LED; American version may get a testing LED in the future
• User programs are prohibited from using any IN/OUT instructions
  • OUT causes a reset
  • IN produces a constant value
  • The port protections make the following operations inaccessible: working with interupts, crystal timers, changing LCD parameters, and direct key input.
• Flash starts at $000000
  • There is ALSO still a flash unlock sequence
• RAM starts at $D00000
• Assembly programs and TI-BASIC programs are limited to one sector (64KB)
• VRAM starts at $D40000
  • VRAM is executable