TI99-Motherboard
About the TI99-Motherboard PCB
TI99-Motherboard is an open source PCB design by rkrenicki, published on GitHub. It is a board, with 85 components from 33 distinct parts.
Other key parts include the TMS9928A, TMS4116 and 74LS32. By type, the board carries 42 capacitors, 14 resistors, 10 ICs, 10 inductors, 2 transistors and 1 crystal.
From the project
This is a work-in-progress! I am currently tracking down errors in the schematic, and it should not be trusted as 100% accurate at this point!
This is a work-in-progress! I am currently tracking down errors in the schematic, and it should not be trusted as 100% accurate at this point!
This is based on the HackMac KiCAD schematics with corrections as I have been working through them. All of the labels have been changed to global, as I find them far easier to work with.
Please note that this has also been converted to KiCAD 6.x.
Main components on the TI99-Motherboard
TI99-Motherboard bill of materials (BOM)
85 components, 33 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TMS9928A | DIP-40_W15.24mm | U100 |
| 8 | TMS4116 | DIP-16_W7.62mm | U102, U103, U104, U105, U106, U107, U108, U109 |
| 1 | 74LS32 | DIP-14_W7.62mm | U507 |
| 1 | 2N3906 | TI-Transistors | Q200 |
| 1 | 2N3904 | TI-Transistors | Q201 |
| 1 | 10.7MHz | Crystal_HC18-U_Vertical | Y100 |
| 1 | CONN_01X06 | DIN6 | J201 |
| 2 | 1N4148 | Diode-11.50mm | CR200, CR201 |
| 2 | Jumper_3_Bridged12 | 3-way-Jumper | W201, W203 |
| 1 | Jumper | Passive-11.50mm | W205 |
| 1 | 2- 4.5µH | Varible-inductor | L100 |
| 5 | 6.8µH | R_Axial_DIN0207_L6.3mm_D2.5mm_P15.24mm_Horizontal | L101, L102, L103, L104, L200 |
| 1 | 6.8uH | R_Axial_DIN0207_L6.3mm_D2.5mm_P15.24mm_Horizontal | L201 |
| 1 | 27µH | R_Axial_DIN0207_L6.3mm_D2.5mm_P15.24mm_Horizontal | L202 |
| 1 | 8.2µH | R_Axial_DIN0207_L6.3mm_D2.5mm_P15.24mm_Horizontal | L203 |
| 1 | 5.8µH | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | L207 |
| 1 | 56pF | Passive-11.50mm | C100 |
| 1 | 12pF | Passive-11.50mm | C101 |
| 2 | 0.001µF | Passive-11.50mm | C102, C206 |
| 1 | 100µF | Capacitor-22.75mm | C103 |
Show 13 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 6 | 0.01µF | Passive-11.50mm | C104, C143, C145, C202, C203, C208 |
| 26 | 0.1µF | Passive-11.50mm | C105, C106, C107, C108, C109, C110, C111, C112 +18 |
| 3 | 22µF | Capacitor-19.00mm | C128, C129, C130 |
| 1 | 82pF | Passive-11.50mm | C200 |
| 1 | 10µF | Capacitor-22.75mm | C201 |
| 1 | 470kΩ | Passive-11.50mm | R101 |
| 1 | 470Ω | Passive-11.50mm | R102 |
| 5 | 560Ω | Passive-11.50mm | R200, R206, R208, R210, R211 |
| 1 | 56kΩ | Passive-11.50mm | R201 |
| 1 | 2.2kΩ | Passive-11.50mm | R202 |
| 2 | 1kΩ | Passive-11.50mm | R203, R205 |
| 2 | 47Ω | Passive-11.50mm | R204, R207 |
| 1 | 18Ω | Passive-11.50mm | R209 |
TI99-Motherboard design files
The KiCad project lives in the rkrenicki/TI99-Motherboard repository on GitHub; these links point at the commit this page was built from.
- SchematicVideo.kicad_sch
TI99-Motherboard: common questions
How many components are on the TI99-Motherboard?
85 components, from 33 distinct parts. The full bill of materials is listed on this page.
Where can I download the TI99-Motherboard design files?
From the rkrenicki/TI99-Motherboard repository on GitHub, which has the schematic; the links under Design files point to each one.
Can I use the TI99-Motherboard design in my own project?
The repository has no license, so all rights stay with rkrenicki. Use it as a reference, and ask the author before reusing the design.