4 layers114.3 × 74.2 mm
Appletini
jtflanagan/AppleTini
Teeny 4.1-based multifunctional Apple II peripheral card
30 parts17BSD-2-Clause
2 layers58.2 × 114.4 mm
RTO Cart
aotta/RTO-Cart30Redesigned T-Cart - Multicart for Mattel Intellivision based on Teensy 4.1
- Size
- 58.2 × 114.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 17
- Nets
- 110
- Pads
- 201
- Tracks, vias
- 521, 11
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 11 Nov 2022
- Updated
- 17 Oct 2026
Overview
RTO Cart is an open-source printed circuit board by aotta, from the aotta/RTO-Cart repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 58.2 × 114.4 mm with 17 parts on 110 nets, routed with 521 tracks and 11 vias.
It is built around the 74LS245SC and TEENSY 4.1. Its parts include 4 resistors, 4 ICs, 3 capacitors, 2 diodes and 2 connectors. It belongs with the NXP (LPC, Kinetis, i.MX RT) boards of this library.
Main components
274LS245SC
-0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
TEENSY 4.1
Development Boards & Kits - ARM ModuleSparkFun ElectronicsUncategorised
README
README.mdRTO-Cart
Redesigned T-Cart - Multicart for Mattel Intellivision based on Teensy 4.1 It work with bin file loaded on sdcard, with ram/rom mapping from .cfg files with same name in same folder. If found the [macro] section in the .cfg files, it ask for using the Cheat's pokes (middle button) or ignore them (other button). File navigation is done with by buttons, while playing button 1 resets the console, button 3 resets the Cart.
You probably don't need mounting the resistor near the edge for reset the console, try yourself and be sure to have a good bipolar cap at reset line in your console! ;)
More infor on: https://forums.atariage.com/topic/346024-intellivision-rto-multicart-new-multicart/
User manual added by courtesy of Eskimo/RKOTower
Fixed version for SECAM Intellivision (thanks to zx81zx81): https://github.com/zx81zx81/RTO-Cart-secam
Parts
17| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 100nF | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C1, C2, C3 |
| 3 | 74LS245 | Package_DIP:DIP-20_W7.62mm_Socket | U1, U2, U3 |
| 2 | 1K | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R3, R4 |
| 2 | LED | LED_THT:LED_D3.0mm | D1, D2 |
| 2 | R220 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1, R2 |
| 2 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1, SW2 |
| 1 | 2x22 card edge connector | Evan's misc parts:edge mounted 44 pin card edge connector (2x22 pin) | J1 |
| 1 | Oled 0.91" female | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Teensy4.1 | Teensy:Teensy41 | U4 |
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Questions
How big is the RTO Cart PCB?
It measures 58.2 × 114.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the RTO Cart use?
17 parts, built around the 74LS245SC and TEENSY 4.1. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the RTO Cart KiCad files?
From the aotta/RTO-Cart repository on GitHub, at the commit this page was made from: the board is old ver/Kicad/RTO_cart.kicad_pcb and its schematic Kicad/RTO_cart.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the RTO Cart design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).