Texas Instruments TI89 Developer Guide - Page 50
Memory Map, The TI-89 / TI-92 Plus Hardware Overview - calculators
UPC - 033317198566
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8 3.2. Chapter 3: The TI-89 / TI-92 Plus Hardware Overview • A black and white LCD display (100 lines of 160 pixels for the TI-89, 128 lines of 240 pixels for the TI-92 Plus). • A set-line / scan-line style matrix keyboard. • A three line (D0, D1, and ground) serial IO interface. This chapter describes in some detail the locations that an application may need to access in order to accomplish a task. For the most part, interaction with the hardware can be accomplished through the use of specific entry points. To remain compatible with other applications and future revisions of the OS, the developer should utilize entry points wherever possible. Memory Map Memory for the calculators consists of RAM memory, Flash memory, and address space within the ASIC. Memory is limited and optimization is important when developing for these platforms. Additionally, since Flash memory stores the OS, certificates, applications, and does not have infinite life, more restrictions are placed on its use. The OS handles all memory allocation through the heap or file system. See chapter 13. Memory Management. For reference, the memory map is shown in Table 3.1. TI-89 / TI-92 Plus Developer Guide Not for Distribution Beta Version January 26, 2001