Chapter 2: TI-83 Plus Specific Information 5
TI-83 Plus Developer Guide Third Release May 28, 2002
• Z80 Physical RAM Structure
TI-83 Plus physical RAM consists of 32K bytes starting at address 8000h.
FFFFh
8000h
C000h
BFFFh
16K Page 3
16K Page 2
Fig. 2.2: TI-83 Plus RAM
Z80 RAM Structure
The TI-83 Plus has 32K bytes of RAM. The system code partitions the RAM into a
number of areas, which it uses to maintain different types of information. Applications
that need RAM must reuse some of the RAM not currently in use by the system code.
They must request an allocation from the system code User RAM area. Fig. 2.4 shows
how RAM is partitioned.
Legend
System RAM
(Fixed Size)
User RAM
(Grows Up)
Temporary RAM
(Grows Up)
Floating Point Stack
(Grows Up)
Free RAM
Operator Stack
(Grows Down)
Symbol Table
(Grows Down)
Hardware Stack
(Fixed Size)
Addr
8000h
FFFFh
Dynamic Area
Fixed Area
Fig. 2.4: TI-83 Plus RAM Structure
Fig. 2.4 shows the addresses of Z80 logical address space. RAM is always mapped into
the 32K space beginning at logical address from 8000h to FFFFh. The areas (System
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