Decoder
About the Decoder PCB
Decoder is an open source RP2040/RP2350 PCB design by Bread80, published on GitHub. It is a 2-layer board measuring 272.4 × 146.7 mm, with 194 components from 90 distinct parts.
Its main chip is the RP2040_Stamp, from the RP2040/RP2350 family. Other key parts include the 74HCT245, 74LS04 and 74LVC245. By type, the board carries 73 resistors, 45 diodes, 25 capacitors, 8 ICs, 8 transistors and 4 connectors.
It belongs with the retro computing designs in this gallery.
From the project
Datapoint 2200 Schematics and Documents
Revision 2 Fixed footprints for Z14, Z21 Beefed up connections to edge connector for +5V and GND Renamed S0 to S3 LEDs as C0 to C3 Swapped order of C0 to C3 Added central mounting hole to provide extra physical support Slightly repositioned sequencer LEDs due to central spacer, and for better grouping LED for DIV64CLK LED now driven from S3 (DIV64CLK requires a pull-up which is positioned on the processor board)
Main components on the Decoder
Decoder bill of materials (BOM)
194 components, 90 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 74HCT245 | TSSOP-20_4.4x6.5mm_P0.65mm | U901, U902 |
| 4 | 74LS04 | TSSOP-14_4.4x5mm_P0.65mm | U941, U942, U943, U944 |
| 1 | RP2040_Stamp | RP2040_Stamp_SMD | U981 |
| 1 | 74LVC245 | TSSOP-20_4.4x6.5mm_P0.65mm | U982 |
| 2 | 2N2369A | TO-18-3 | Q1, Q2 |
| 6 | 2N7002 | SOT-23 | Q901, Q902, Q903, Q904, Q905, Q906 |
| 1 | 9.8400MHz | Crystal_HC49-U_Horizontal | Y1 |
| 1 | EdgeTop | EdgeConn_28_Pin_Pitch_3.96mm | J4A1 |
| 1 | EdgeBottom | EdgeConn_28_Pin_Pitch_3.96mm | J4B1 |
| 1 | ~WORD_SELECT | PinHeader_1x01_P2.54mm_Horizontal | J902 |
| 1 | USB_B | USB_B_Lumberg_2411_02_Horizontal | J981 |
| 2 | 1N914 | D_DO-34_SOD68_P7.62mm_Horizontal | CR1, CR2 |
| 1 | CLK SRC | PinHeader_1x03_P2.54mm_Vertical | JP901 |
| 1 | BOOTSEL | SW_Push_1P1T_NO_6x6mm_H9.5mm | SW981 |
| 1 | RUN STOP | SW_Tactile_SPST_Angled_PTS645Vx58-2LFS | SW982 |
| 1 | +/T | SW_Tactile_SPST_Angled_PTS645Vx58-2LFS | SW983 |
| 1 | -/S | SW_Tactile_SPST_Angled_PTS645Vx58-2LFS | SW984 |
| 3 | 7474 | DIP-14_W7.62mm_Socket | Z1, Z11, Z16 |
| 1 | 7490 | DIP-14_W7.62mm_Socket | Z2 |
| 3 | 7402 | DIP-14_W7.62mm_Socket | Z3, Z6, Z19 |
Show 70 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 75451 | DIP-8_W7.62mm_Socket | Z4, Z20 |
| 1 | 7410 | DIP-14_W7.62mm_Socket | Z5 |
| 3 | 7400 | DIP-14_W7.62mm_Socket | Z7, Z9, Z17 |
| 1 | 7408 | DIP-14_W7.62mm_Socket | Z8 |
| 3 | 7407 | DIP-14_W7.62mm_Socket | Z10, Z15, Z22 |
| 2 | 7404 | DIP-14_W7.62mm_Socket | Z12, Z13 |
| 2 | 74154 | DIP-24_W15.24mm_Socket | Z14, Z21 |
| 1 | 7493 | DIP-14_W7.62mm_Socket | Z18 |
| 1 | 9.84MHz | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D901 |
| 1 | C3 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D902 |
| 1 | C0 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D903 |
| 1 | C2 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D904 |
| 1 | C1 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D905 |
| 1 | T3 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D906 |
| 1 | T2 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D907 |
| 1 | T0 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D908 |
| 1 | PHASE_CLK | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D909 |
| 1 | PHI1_REG | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D910 |
| 1 | T1 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D911 |
| 1 | INH_MEM | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D912 |
| 1 | DIV64_CLK | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D913 |
| 1 | PHI2_MEM | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D914 |
| 1 | PHI1_MEM | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D915 |
| 1 | STROBE1 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D916 |
| 1 | EN_COMP | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D917 |
| 1 | STROBE3 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D918 |
| 1 | STROBE4 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D919 |
| 1 | STROBE2 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D920 |
| 1 | INT_FACE_CLK | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D921 |
| 1 | PORT0 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D941 |
| 1 | PORT1 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D942 |
| 1 | PORT2 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D943 |
| 1 | PORT3 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D944 |
| 1 | BEEP | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D945 |
| 1 | CLICK | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D946 |
| 1 | DECK1 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D947 |
| 1 | DECK2 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D948 |
| 1 | RD_BLK | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D949 |
| 1 | WR_BLK | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D950 |
| 1 | WR_EOF | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D951 |
| 1 | BACKSP | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D952 |
| 1 | SLEWFWD | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D953 |
| 1 | SLEWBCK | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D954 |
| 1 | REWIND | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D955 |
| 1 | T_STOP | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D956 |
| 1 | ADDR | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D957 |
| 1 | STATUS | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D958 |
| 1 | DATA | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D959 |
| 1 | WRITE | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D960 |
| 1 | COM1 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D961 |
| 1 | COM2 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D962 |
| 1 | COM3 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D963 |
| 1 | COM4 | LED_Dialight_597_xxxx_407F_SMT_RA_3mmx2mmx1mm | D964 |
| 1 | 120uH 75mA | L_Axial_L9.5mm_D4.0mm_P12.70mm_Horizontal_Fastron_SMCC | L1 |
| 2 | 160p | C_Disc_D7.0mm_W2.5mm_P5.00mm | C1, C2 |
| 1 | 51p | C_Disc_D7.0mm_W2.5mm_P5.00mm | C3 |
| 5 | 6V47u | CP_Radial_D6.3mm_P2.50mm | C4, C8, C9, C15, C20 |
| 12 | .1u | C_Disc_D7.0mm_W2.5mm_P5.00mm | C5, C6, C7, C11, C12, C13, C14, C17 +4 |
| 1 | .01u 50V | C_Disc_D7.0mm_W2.5mm_P5.00mm | C10 |
| 1 | .1 | C_Disc_D7.0mm_W2.5mm_P5.00mm | C16 |
| 3 | .001u 200V | C_Disc_D7.0mm_W2.5mm_P5.00mm | C21, C22, C23 |
| 1 | 1k5 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 11 | 2k2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R9, R19, R20, R21, R22, R23, R24 +3 |
| 3 | 1k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R5, R6 |
| 1 | 560 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 5.1 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 1 | 1.2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8 |
| 1 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10 |
| 9 | 470 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11, R12, R13, R14, R15, R16, R17, R18 +1 |
| 45 | 470 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R901, R902, R903, R904, R905, R906, R907, R908 +37 |
Decoder design files
The KiCad project lives in the Bread80/Datapoint2200 repository on GitHub; these links point at the commit this page was built from.
Decoder: common questions
What microcontroller does the Decoder use?
The Decoder is built around the RP2040_Stamp, from the RP2040/RP2350 family.
How big is the Decoder PCB?
The Decoder measures 272.4 × 146.7 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Decoder?
194 components, from 90 distinct parts. The full bill of materials is listed on this page.
Where can I download the Decoder design files?
From the Bread80/Datapoint2200 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Decoder design in my own project?
The repository has no license, so all rights stay with Bread80. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Decoder without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.
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