Introduction to the Ti-83 Plus
The TI-83 Plus is nearly identical to the TI-83, maintaining backwards compatibility, like the psx1 to the psx2- programs for the plus may not work on the 83, but all 83 programs(except ASM due to a different CPU chip) will work on the plus. It also has greatly increasing available memory and allowing for flash-upgradeable ROM and commercial calculator-based applications, available at the TI website. Note: Some of this was taken from www.ticalc.org

Model Specifications
CPU : 8 MHz ZiLOG Z80 (running at 6 MHz)
Memory : 24K RAM, 160K Flash ROM
Screen Size : 96x64 pixels; Black and White
Link Port? Yes