3-in-1dual
About the 3-in-1dual PCB
3-in-1dual is an open source PCB design by rkrenicki, published on GitHub. It is a 2-layer board measuring 125 × 100 mm, with 28 components from 19 distinct parts.
By type, the board carries 7 capacitors and 3 resistors.
From the project
Variant of the 3-in-1 Expansion board with Dual Serial and a second Parallel port.
This is a single expansion board designed for the Tandy 1000 EX and HX computers, to include the following upgrades:
640KB Base System Memory and 96KB Upper Memory 2x 16550-based DE9 Serial RS232 Ports and 1x Parallel Port * XT-IDE based CompactFlash "Hard Drive"
This board is for the Tandy 1000EX and 1000HX computers only. It will not work in any other computer model as it is. You must remove any expansion cards already in the computer, this is designed to be a single-board upgrade and has no provisions to allow for any other expansion cards.
3-in-1dual bill of materials (BOM)
28 components, 19 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TANDY_BUS | TANDY-PLUS-BUS | BUS1 |
| 1 | CF Interface | PinSocket_2x20_P2.54mm_Vertical | CF-J1 |
| 1 | CF Power | PinSocket_1x02_P2.54mm_Vertical | CF-J2 |
| 1 | 74LS139 | DIP-16_W7.62mm | CF-U1 |
| 2 | 74LS688 | DIP-20_W7.62mm | CF-U2, ROM-U4 |
| 1 | 74LS245 | DIP-20_W7.62mm | CF-U3 |
| 1 | 100uF | CP_Radial_D5.0mm_P2.50mm | CP1 |
| 1 | Multi-IO Mezzanine Data/IO | PinHeader_2x11_P2.54mm_Vertical | IO-J2 |
| 1 | Multi-IO Mezzanine Output | PinHeader_2x10_P2.54mm_Vertical | IO-J3 |
| 1 | 74LS138 | DIP-16_W7.62mm | IO-U9 |
| 1 | 74LS08 | DIP-14_W7.62mm | IO-U10 |
| 1 | 74LS04 | DIP-14_W7.62mm | IO-U11 |
| 1 | AS6C4008-55PCN | DIP-32_W15.24mm | RAM-U6 |
| 1 | 74LS32 | DIP-14_W7.62mm | RAM-U7 |
| 1 | 74LS00 | DIP-14_W7.62mm | RAM-U8 |
| 1 | ROM Write Enable | PinHeader_1x02_P2.54mm_Vertical | ROM-JP1 |
| 1 | 39SF0x0 | DIP-32_W15.24mm | ROM-U5 |
| 7 | 0.1uF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C1, C2, C3, C4, C5, C6, C7 |
| 3 | 10K | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R2, R3, R4 |
3-in-1dual design files
The KiCad project lives in the rkrenicki/Tandy-EX-HX-3in1-V2 repository on GitHub; these links point at the commit this page was built from.
- Layout3-in-1dual.kicad_pcb
- Schematic3-in-1dual.kicad_sch
3-in-1dual: common questions
How big is the 3-in-1dual PCB?
The 3-in-1dual measures 125 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the 3-in-1dual?
28 components, from 19 distinct parts. The full bill of materials is listed on this page.
Where can I download the 3-in-1dual design files?
From the rkrenicki/Tandy-EX-HX-3in1-V2 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the 3-in-1dual 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.
