Tandy-EX-HX-4in1
About the Tandy-EX-HX-4in1 PCB
Tandy-EX-HX-4in1 is an open source PCB design by rkrenicki, published on GitHub. It is a 2-layer board measuring 100 × 100 mm, with 43 components from 21 distinct parts.
By type, the board carries 17 capacitors, 3 resistors and 1 jumper.
From the project
This is a single expansion board designed for the Tandy 1000 EX and HX computers, to include the following upgrades:
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 16550-based DE9 Serial RS232 Port XT-IDE based CompactFlash "Hard Drive" Integrated DS1315 "Smartwatch" Real Time Clock (Optional)
This is an SMD variant of my original "Tandy 1000 EX/HX 3-in-1" which I was able to shrink down to 100x100mm. With the space that I had left over, I added provisions for an optional DS1315 based "Smartwatch" RTC, and added a bus passthrough header.
Tandy-EX-HX-4in1 bill of materials (BOM)
43 components, 21 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 1.8432MHz | Oscillator_SMD_SeikoEpson_SG8002CA-4Pin_7.0x5.0mm_HandSoldering | 232-OSC1 |
| 1 | GD75232 | SSOP-20_5.3x7.2mm_P0.65mm | 232-U6 |
| 2 | 74LS138 | SOIC-16_3.9x9.9mm_P1.27mm | 232-U7, 232-U9 |
| 1 | 16C550 | LQFP-48_7x7mm_P0.5mm | 232-U8 |
| 2 | TANDY_BUS | TANDY-PLUS-BUS | BUS1, BUS2 |
| 1 | CF Interface | PinSocket_2x20_P2.54mm_Vertical | CF-J1 |
| 1 | CF Power | PinSocket_1x02_P2.54mm_Vertical | CF-J2 |
| 1 | 74LS139 | SOIC-16_3.9x9.9mm_P1.27mm | CF-U1 |
| 2 | 74LS688 | SOIC-20W_7.5x12.8mm_P1.27mm | CF-U2, ROM-U4 |
| 2 | 74LS245 | SOIC-20W_7.5x12.8mm_P1.27mm | CF-U3, RAM-U11 |
| 1 | 100uF | CP_Radial_D5.0mm_P2.50mm | CP1 |
| 1 | Jumper | PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | AS6C4008-55SIN | SSOP-32_11.305x20.495mm_P1.27mm | RAM-U10 |
| 1 | 74LS00 | SOIC-14_3.9x8.7mm_P1.27mm | RAM-U12 |
| 1 | 74LS32 | SOIC-14_3.9x8.7mm_P1.27mm | RAM-U13 |
| 1 | 39SF0x0 | DIP-32_W15.24mm_Socket | ROM-U5 |
| 1 | CR1220 | BatteryHolder_Keystone_3001_1x12mm | RTC-BT1 |
| 1 | DS1315 | SOP-16_7.5x10.4mm_P1.27mm | RTC-U15 |
| 1 | 32.768kHz | Crystal_DS10_D1.0mm_L4.3mm_Horizontal | RTC-Y1 |
| 17 | 0.1uF | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1, C2, C3, C4, C5, C6, C7, C8 +9 |
Show 1 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 10K | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1, R2, R3 |
Tandy-EX-HX-4in1 design files
The KiCad project lives in the rkrenicki/Tandy-EX-HX-4in1 repository on GitHub; these links point at the commit this page was built from.
- Layout4-in-1-SMD.kicad_pcb
- Schematic4-in-1-SMD.kicad_sch
Tandy-EX-HX-4in1: common questions
How big is the Tandy-EX-HX-4in1 PCB?
The Tandy-EX-HX-4in1 measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Tandy-EX-HX-4in1?
43 components, from 21 distinct parts. The full bill of materials is listed on this page.
Where can I download the Tandy-EX-HX-4in1 design files?
From the rkrenicki/Tandy-EX-HX-4in1 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Tandy-EX-HX-4in1 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.