The TI 83+SE's hardware

Internal components
- The CPU
- The RAM memory
- The FlashROM memory
- The microcontroller

 

CPU

    To begin, click on the thumbnail to enlarge my CPU...

CPU picture
 

Pin assignment (caution you need to switch the processor turn to the left to have the correct numbers !)

Technical information about this processor.
Measurements of package shown above

You don't know how to open the last file ? It seems that you need Acrobat Reader...
Click the little picture to download it:
 

TI 83+' RAM

    This page only presents very general info about TI 83+' RAM, for more details concerning its operation please refer to the manufacturer's documentation.

Zoom...and pin assignment of the RAMCapacity

32KB (Only 24 are made available to the user)

Pin assignment

/WE Write Enable, allows you to write data when at the high state when /OE is at the same logic state
/OE Output Enable
/CS Chip Select
Vcc +5V power supply
Vss Ground

Current consumption in activity: 10 mA.  In standby: 20A

Minimal voltage for data retention: 2V (In other words replace the lithium backup battery when it falls slightly above 2V...)

Adresses on 15 bits (A0 to A14) from 0000H to 7FFFH (only a part is user available), data on 8 bits (D0 to D7)

Underlined in red: manufacturer's code; here,GM = Goldstar
Framed in yellow 76C256: memory reference
Underlined in green: allowed operating temperatures, here,C = commercial; 0C to +70C

Infos about TI 83+' SRAM (Thanks to NSPIRIT). Unfortunately, it seems that this file doesn't open easily with Acrobat Reader, so NSPIRIT made JPEG screenshots so anyone can read it...

Got some info I don't about this SRAM chip ? Mail me !

 

Coming: an HTML version of the PDF documents...

 

Another version of the TI 83+' RAM, of Sanyo brand

Another RAM...same pin assignment

More information about this SRAM chip coming up...Here they are..

   I'll pass these pages to an OCR software soon, while waiting, why not peek at the pictures in GIF format ?....It's not perfect, (scanned from a fax...) but should be readable :):

Infos about the TI 83+' RAM...

 

 

TI 83+' Flash ROM

    Here are some very general info about the TI 83+ FlashROM, for more details on its operation, refer to the manufacturer's manual.

Zoom on the FlashROM

Underlined in red: manufacturer's code; here, AM = AMD
Framed in yellow 29F400B: chip reference
Underlined in purple: Place of boot sector for the chip; here, T = Top (vs. B = Bottom)
Underlined in mauve: speed code; here, this model has a 120 ns maximum access time to data in memory
Underlined in grey: Package type; E = Thin Small Outline Package, normal pinout (vs. reversed - see PDF technical doc page 5)
Underlined in green: allowed operating temperatures, here, C = commercial; 0C to +70C

Power supply : 5V 10% This is why it is not recommended to operate your calculator if your batteries are below 4,5V, even though the 1.13 AMS version is more stable under low battery conditions.

Current consumption: 19 mA reading (40 mA max.), 36 mA writing (60 mA max.), 0.4 mA standby (1 mA max.)

Number of write/erase cycles before failure: 100 000

    Datasheet from AMD on this chip (You'll need Acrobat Reader)

Capacity

    512KB (160 are available to the user, but you may add 60 to this value doing the operations described on this page (in French)...)

Pin assignment

FlashROM pinout

Got some info I don't about the FlashROM chip ? Mail me !

 

 

 

 

 

 

 

 

 

Another version of the FlashROM

Another version of the FlashROMUnderlined in red: manufacturer's code; here, HY =...Hyundai :)
Framed in yellow 29F400: chip reference, with F corresponding to the operating voltage: 5V, here.
Underlined in purple: Place of boot sector for the chip; here, T = Top (vs B = Bottom)
Underlined in mauve: speed code; here, this model has a 90 ns maximum access time to data in memory
Underlined in gray: Package type; T = Thin Small Outline Package, normal pinout (vs reversed - see PDF technical doc page 3)
Underlined in green (I know there's nothing :): allowed operating temperatures, here,C = commercial; 0C to +70C

Voltage: +5V

  Datasheet from Hynix (They changed name since...) about this FlashROM  (in PDF format for Acrobat Reader)

Coming: an HTML version of the PDF documents...

 

The microcontroller

    Unfortunately TI told me this circuit was proprietary, so they couldn't send me any information about it :(
Wanna modify this ? Go and see the overclock page...

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