TI-99/4A Glossary

Acronyms and other terms pertaining to the Texas Instruments TI-99/4A home computer from the early '80s

• > - TMS9900 hexadecimal prefix sigil, equivalent to the $ or 0x prefixes or h suffix on other platforms
• CRU - Communications Register Unit
• .ctg - A cartridge file format used only by the ti99sim emulator
• DIS/FIX - Display/Fixed
  one of the five basic file types indicated in the FDR
• DIS/VAR - Display/Variable
  one of the five basic file types indicated in the FDR
• DSR - Device Service Routine
• E/A - Editor/Assembler
• EA3 - Option 3 in the TI Editor/Assembler. "LOAD AND RUN". Loads an assembly file in tagged-object code.
• EA5 - Option 5 in the TI Editor/Assembler. "RUN PROGRAM FILE". Used to load and run a memory-image file in "program" format.
• Ed/As - Editor/Assembler
• ExBas - Extended BASIC
• FAC - Floating-point Accumulator
• FDR - File Descriptor Record
• FIAD - Files In A Directory - A 128-byte header prepended to TI-99/4A files adding metadata the system stores outside the file in the FDR. Also known as "V9T9". Distinct from TIFILES.
• GPL - Graphics Programming Language
• GROM - Graphics Read-Only Memory
• INT/FIX - Internal/Fixed
  one of the five basic file types indicated in the FDR
• INT/VAR - Internal/Variable
  one of the five basic file types indicated in the FDR
• ISR - Interrupt Service Routine
• MXT
• PAB - Peripheral Address Block
• PEB - Peripheral Expansion Box
• PROGRAM
  one of the five basic file types indicated in the FDR
• .rpk - A cartridge file format used only by the MAME emulator. Based on the PKZIP archive format.
• RXB - Rich Extended Basic
• Standard Header
• Subprogram
• TIFILES - A 128-byte header prepended to TI-99/4A files adding metadata the system stores outside the file in the FDR. Also known as "XMODEM". Distinct from FIAD.
• VDP - Video Display Processor
• XB - Extended BASIC
• XML - Mnemonic for the GPL opcode >73, Execute Machine Language