2 layers271.8 × 78.7 mm
PCPI AppliCard
baldengineer/bit-preserve
Project for capturing vintage, classic, aka old computer schematics in KiCad.
82 parts446
4 layers86.4 × 50.8 mm
PCTGotekAdapter
ajfite/PCT-GoDriveApple II PC Transporter to DOS Drive adapter
- Size
- 86.4 × 50.8 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 20
- Nets
- 40
- Pads
- 176
- Tracks, vias
- 278, 29
- Pours
- 119
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 22 Jun 2023
- Updated
- 27 Jun 2024
Overview
PCTGotekAdapter is an open-source printed circuit board by ajfite, from the ajfite/PCT-GoDrive repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 4-layer board of 86.4 × 50.8 mm with 20 parts on 40 nets, routed with 278 tracks and 29 vias.
It is built around the SN7407N and SN74LS138N. Its parts include 5 connectors, 4 resistors, 2 capacitors and 2 ICs. It belongs with the retro computing and games and interfaces and adapters boards of this library.
Main components
2
SN7407N
PDIP-140℃~+70℃ 1 250uA 4.75V~5.25V 40mA 6 7400 Level shifting Open Collector TTL compatible CMOS Unidirectional PDIP-14 Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
SN74LS138N
DIP-160℃~+70℃ 10mA 3/8 4.75V~5.25V 400uA 41ns@5V,15pF 74LS 8mA Decoder Single Supply DIP-16 Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders
README
README.mdPC Transporter GoDrive
A clone of the original Applied Engineering Transdrive adapter that allows you to connect an Apple II PC Transporter to a standard DOS Drive.
At this time it has only been tested with Gotek Floppy Emulators but it should allow you to use any DOS PC Drive of the era.
BOM
The DigiKey part number reflect my most recent order - you can substitute as you see fit.
| Schematic Part | Part | Total Quantity | Manufacturer Part Number | DigiKey Part Number | Notes |
|---|---|---|---|---|---|
| U1 | 74LS138/1 | 1 | TI SN74LS138N | 296-1639-5-ND | |
| U2 | 7407N | 1 | TI SN7407N | 296-1436-ND | |
| R1, R2, R3, R4 | 2.7K Resistor | 4 | Stackpole RSMF2JT2K70 | RSMF2JT2K70CT-ND | Any 2.7k commodity resistor will work, the pad is sized perfectly for the noted part but you definitely can use a smaller cheaper resistor. The large resistors where an aesthetic choice. |
| C1, C2 | 0.1uF Capacitor | 2 | Nichicon UKL1H0R1MDDANA | 493-15375-ND | |
| J1, J2 | 34 position keyed header | Up to 2 | On Shore Tech 302-S341 | ED10528-ND | This connector is optional, depends on how you want to connect your floppy drive to the board |
Total BOM cost for parts only at time of purchasing (June 13, 2023) was $11.81.
Unfortunately the DB-19 connector for the Apple II interface is not easily sourced, so it is not included here.
License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Parts
20| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 270K | Resistor_THT:R_Axial_DIN0414_L11.9mm_D4.5mm_P15.24mm_Horizontal | R1, R2, R3, R4 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_3.2mm_M3_Pad_Via | H1, H2, H3, H4 |
| 3 | TestPoint | TestPoint:TestPoint_Pad_2.5x2.5mm | TP1, TP2, TP3 |
| 2 | .1uF | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1, C2 |
| 2 | Conn_01x04_Pin | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J5, J6 |
| 2 | Conn_02x17_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x17_P2.54mm_Vertical | J1, J3 |
| 1 | Conn_2Rows-19Pins | Connector_PinHeader_2.54mm:PinHeader_2x10_P2.54mm_Vertical | J2 |
| 1 | SN7407N | SN7407N:DIP794W45P254L1969H508Q14 | U2 |
| 1 | SN74LS138N | SN74LS138N:DIP794W45P254L1969H508Q16 | U1 |
Questions
How big is the PCTGotekAdapter PCB?
It measures 86.4 × 50.8 mm and has 4 copper layers, 1.6 mm thick.
What parts does the PCTGotekAdapter use?
20 parts, built around the SN7407N and SN74LS138N. 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 PCTGotekAdapter KiCad files?
From the ajfite/PCT-GoDrive repository on GitHub, at the commit this page was made from: the board is PCTGotekAdapter.kicad_pcb and its schematic PCTGotekAdapter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the PCTGotekAdapter design in my own project?
Its repository publishes it under the CC-BY-SA-4.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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