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Pi Time



 •  5-year club

Collection Calculators Accessories

Quick facts:

  • Count: 23 graphing calculators (14 distinct models)
  • Total weight: ≈ 6.2 kg / 13.7 lbs.
  • By series: 22x TI (16x Z80, 4x 68k, 1x eZ80, 1x Other), 1x Casio
  • Oldest calculator: a TI-81 manufactured in September 1990
  • Newest calculator: a TI-83 Plus manufactured in July 2020
  • Achievements:
    • Total earned: 6 achievements


Model Factory Datecode HW Rev. Serial number Software version(s) Physical condition Extras Acquisition date Pic Comment
I 0990 pre-A 0929933 1.1K Good 2018 No backup battery.
Grey-pixel LCD.
I 0292 A 0250267 1.6K Broken 2018 Dismantled for parts.
Grey-pixel LCD.
I 0596 R 43312150 19.0 Good Manual(s) 2015 Fine ribbon cable repairs.
I 0100 1120V04287 Boot 1.05 / Base 2.0.9 Worn 2019 Corrosion repairs.
I 0194 K 13021351 Original 16.0 / Installed 18.0 Fair First calculator in my collection.
Swapped LCD from the 1094Q and repaired fine ribbon cable.
Swapped ROM chip from the 1094Q to improve contrast.
I 0499 B 12021494 1.00 Poor 2018 Extensive and unreliable corrosion repairs.
I 0396 I 40477655 10.0 Good 2017 Overclocked.
Fine ribbon cable repairs.
I 0700 K 1391010560 1.6 Good Manual(s) 2018 Overclocked
T6A49A ASIC Swap
Personal favorite
L 0315 pre-A 1033005165 Boot 5.0.0.0089 / Base 5.3.0.0037 Good Manual(s) 2016
I 0293 B 02105073 1.8K Fair 2019 Overclocked.
Blue-pixel LCD.
Case swap with the I-0292A.
I 0893 E VB0801447 V2.0V Good 2019 Untethered VSC port.
Serial number sticker on the inside.
VSC daughterboard serial 000272.
Grey-pixel LCD.
I 0796 V1208460 1.11 Good 2020
S 0203 B 2074013709 Boot 1.00 / Base 1.19 Good 2021 Coarse ribbon cable repairs.
Preloaded with Base 1.14.
I 0495 B 050132 4.0 Good Manual(s), CD(s) 2021 Fine ribbon cable repairs.
TI Graph Link for TI-80 software floppy.
I 1094 Q 24033863 18.0 until I removed the chip Broken 2021 Heavily corroded mainboard.
Dismantled for parts.
I 0699 O 43910669 1.10 Fair 2021 LCD row blanks.
83 Plus style housing.
Z180 MPU ASIC with ZiLOG branding.
I 0197 I 51050886 10.0 Good 2021 Fine ribbon cable repairs. (150C iron to the glass/cable connection)
I 0901 A 1411V001161 1.50 Fair 2021 Dings and scratches. Repaired V+ line to LCD.
Good Box, Manual(s) 2019 fx-7700GB
Pinched ribbon cable propped up with foam.
L 0720 E 1075000636 1.19 Good 2022 With Kinpo LCD and chip-on-board ASIC.
Disfigured faceplate; replaced with one from 0701A
S 0701 A 2178023690 1.19 Broken 2022 Corrosion and missing columns.
Dismantled for parts.
I 0990 pre-A 0903775 Broken 2022 Defective coarse and fine ribbon cables.
Dismantled for T6A49A chip.
I 0399 B 11102785 2.03 Fair 2023 Corrosion repairs.