https://github.com/hippietrail/ti-99-4a-glossary

Acronyms and other terms pertaining to the TI-99/4A home computer from the early '80s
https://github.com/hippietrail/ti-99-4a-glossary

1980s 80s glossary retrocomputing terminology ti-99 ti-994a ti994a

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

• Host: GitHub
• URL: https://github.com/hippietrail/ti-99-4a-glossary
• Owner: hippietrail
• Created: 2024-09-15T12:55:13.000Z (5 months ago)
• Default Branch: main
• Last Pushed: 2024-09-18T02:56:13.000Z (5 months ago)
• Last Synced: 2024-09-18T06:18:17.976Z (5 months ago)
• Topics: 1980s, 80s, glossary, retrocomputing, terminology, ti-99, ti-994a, ti994a
• Homepage:
• Size: 5.86 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
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  • Readme: README.md

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# 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** - **C**ommunications **R**egister **U**nit

- **.ctg** - A cartridge file format used only by the ti99sim emulator

- **DIS/FIX** - **Dis**play/**Fix**ed  

  one of the five basic file types indicated in the **FDR**

- **DIS/VAR** - **Dis**play/**Var**iable  

  one of the five basic file types indicated in the **FDR**

- **DSR** - **D**evice **S**ervice **R**outine

- **E/A** - **E**ditor/**A**ssembler

- **EA3** - Option 3 in the TI **E**ditor/**A**ssembler. "LOAD AND RUN". Loads an assembly file in tagged-object code.

- **EA5** - Option 5 in the TI **E**ditor/**A**ssembler. "RUN PROGRAM FILE". Used to load and run a memory-image file in "program" format.

- **Ed/As** - **Ed**itor/**As**sembler

- **ExBas** - **Ex**tended **BAS**IC

- **FAC** - **F**loating-point **Ac**cumulator

- **FDR** - **F**ile **D**escriptor **R**ecord

- **FIAD** - **F**iles **I**n **A** **D**irectory - 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** - **G**raphics **P**rogramming **L**anguage

- **GROM** - **G**raphics **R**ead-**O**nly **M**emory

- **INT/FIX** - **Int**ernal/**Fix**ed  

  one of the five basic file types indicated in the **FDR**

- **INT/VAR** - **Int**ernal/**Var**iable  

  one of the five basic file types indicated in the **FDR**

- **ISR** - **I**nterrupt **S**ervice **R**outine

- **MXT**

- **PAB** - **P**eripheral **A**ddress **B**lock

- **PEB** - **P**eripheral **E**xpansion **B**ox

- **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** - **R**ich E**x**tended **B**asic

- **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** - **V**ideo **D**isplay **P**rocessor

- **XB** - E**x**tended **B**ASIC

- **XML** - Mnemonic for the GPL opcode `>73`, E**x**ecute **M**achine **L**anguage