Dragon64
About the Dragon64 PCB
Dragon64 is an open source PCB design by danwerner21, published on GitHub. It is a 2-layer board measuring 333.2 × 205.9 mm, with 220 components from 105 distinct parts.
Other key parts include the 74LS244, LM393, 4050, 6821 and 4529. By type, the board carries 77 capacitors, 70 resistors, 37 ICs, 12 diodes, 5 connectors and 4 inductors.
From the project
A clone board for the Dragon64 and Tandy Color Computer
The schematic capture is complete, and I've done one full verification pass. But I'm still making no promises about correctness! I've uploaded a PDF for those without access to KiCad.
A lot of the PCB positioning is now correct - at least to the nearest mm, usually better - and everything's pointing in a sensible direction with the exception of some diodes: Dragon Data ensured they always had the cathode to the right, presumably to avoid manufacturing confusion, and I've preserved that decision.
Main components on the Dragon64
Dragon64 bill of materials (BOM)
220 components, 105 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 74LS244 | DIP-20_W7.62mm_Socket_LongPads | IC1, IC25 |
| 1 | LM393 | DIP-8_W7.62mm_Socket_LongPads | IC2 |
| 1 | 4050 | DIP-16_W7.62mm_Socket_LongPads | IC4 |
| 2 | 6821 | DIP-40_W15.24mm_Socket_LongPads | IC5, IC8 |
| 1 | 4529 | DIP-16_W7.62mm_Socket_LongPads | IC6 |
| 1 | 4069 | DIP-14_W7.62mm_Socket_LongPads | IC7 |
| 1 | 6847 | DIP-40_W15.24mm_Socket_LongPads | IC10 |
| 1 | 6551 | DIP-28_W15.24mm_Socket_LongPads | IC11 |
| 8 | 4164 | DIP-16_W7.62mm_Socket_LongPads | IC15, IC16, IC21, IC22, IC26, IC27, IC32, IC33 |
| 1 | 74LS273 | DIP-20_W7.62mm_Socket_LongPads | IC20 |
| 1 | 27C128 | DIP-28_W15.24mm_Socket_LongPads | IC34 |
| 2 | 74LS00 | DIP-14_W7.62mm_Socket_LongPads | IC35, U3 |
| 1 | 74LS02 | DIP-14_W7.62mm_Socket_LongPads | IC36 |
| 1 | 27C128 | DIP-28_W15.24mm_Socket_LongPads | IC37 |
| 1 | MC6809E | DIP-40_W15.24mm_Socket_LongPads | IC38 |
| 1 | 6883 | DIP-40_W15.24mm_Socket_LongPads | IC39 |
| 1 | 74LS138 | DIP-16_W7.62mm_Socket_LongPads | IC40 |
| 1 | MAX232 | DIP-16_W7.62mm_Socket_LongPads | U1 |
| 1 | MC1372 | DIP-14_W7.62mm_Socket_LongPads | U2 |
| 1 | 74LS07 | DIP-14_W7.62mm_Socket_LongPads | U4 |
Show 85 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 27C64 | DIP-28_W15.24mm_Socket_LongPads | U5 |
| 1 | 74LS04 | DIP-14_W7.62mm_Socket_LongPads | U6 |
| 1 | 74LS139 | DIP-16_W7.62mm_Socket_LongPads | U7 |
| 1 | 74LS06N | DIP-14_W7.62mm_Socket_LongPads | U8 |
| 1 | 74LS174 | DIP-16_W7.62mm_Socket_LongPads | U9 |
| 1 | WD2797 | DIP-40_W15.24mm | U10 |
| 1 | 74LS74 | DIP-14_W7.62mm_Socket_LongPads | U11 |
| 1 | 14.31818MHZ 14.31818Mhz | DIP-14_W7.62mm_Socket_LongPads | X1 |
| 1 | 4mhz | Crystal_HC49-U_Vertical | Y1 |
| 1 | 1.8432MHZ 1.8432Mhz | Crystal_HC49-U_Vertical | Y2 |
| 1 | Screw_Terminal_01x03 | TerminalBlock_RND_205-00277_1x03_P5.00mm_Vertical | J1 |
| 1 | TTL Serial Connector | PinHeader_1x06_P2.54mm_Vertical | J2 |
| 1 | composite on luma | PinHeader_1x02_P2.54mm_Vertical | J3 |
| 1 | DISK ROM ENABLE | PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | Floppy Interface | IDC-Header_2x17_P2.54mm_Vertical | J6 |
| 1 | RAM SIZE SELECT | PinHeader_1x03_P2.54mm_Vertical | LK1 |
| 1 | Keyboard | PinHeader_1x16_P2.54mm_Vertical | PL1 |
| 1 | Printer | IDC-Header_2x10-1MP_P2.54mm_Latch_Horizontal | PL2 |
| 1 | Joystick R | DIN-6_DELTRON_671-0601_Horizontal | PL3 |
| 1 | Cassette | DIN-5_DELTRON_671-0501_45deg_Horizontal | PL4 |
| 1 | Joystick L | DIN-6_DELTRON_671-0601_Horizontal | PL5 |
| 1 | Video/Audio | PinHeader_1x09_P2.54mm_Vertical | PL6 |
| 1 | Cartridge | Edge_2x20_P2.54mm_Horizontal | PL9 |
| 1 | SPDT | Relay_SPDT_HJR-4102 | RLA1 |
| 1 | 10K-READ 10K-Read | Potentiometer_Vishay_T73YP_Vertical | RV1 |
| 1 | 10K-READ 10K-Write | Potentiometer_Vishay_T73YP_Vertical | RV2 |
| 1 | BC182L | TO-92 | TR1 |
| 5 | 1N914 | D_DO-35_SOD27_P7.62mm_Horizontal | D1, D8, D12, D13, D14 |
| 2 | BZX 61 | D_DO-35_SOD27_P7.62mm_Horizontal | D2, D3 |
| 1 | 1N4002 | D_DO-35_SOD27_P7.62mm_Horizontal | D4 |
| 4 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D5, D6, D7, D11 |
| 4 | 3.3U 3.3u | L_Axial_L5.3mm_D2.2mm_P7.62mm_Horizontal_Vishay_IM-1 | L1, L2, L3, L4 |
| 38 | .01u | C_Disc_D7.5mm_W2.5mm_P5.00mm | C1, C7, C11, C12, C18, C20, C21, C22 +30 |
| 1 | 0.22uf | C_Disc_D7.5mm_W2.5mm_P5.00mm | C2 |
| 1 | .002u | C_Disc_D7.5mm_W2.5mm_P5.00mm | C3 |
| 6 | .1u | C_Disc_D7.5mm_W2.5mm_P5.00mm | C4, C27, C28, C59, C60, C61 |
| 1 | 47pf | C_Disc_D7.5mm_W2.5mm_P5.00mm | C5 |
| 5 | .02u | C_Disc_D7.5mm_W2.5mm_P5.00mm | C6, C13, C14, C15, C16 |
| 2 | 1u | C_Disc_D7.5mm_W2.5mm_P5.00mm | C8, C48 |
| 4 | 1u | CP_Radial_D4.0mm_P2.00mm | C9, C24, C25, C54 |
| 1 | 10U 10u | CP_Radial_D4.0mm_P2.00mm | C10 |
| 1 | 22P 22p | C_Disc_D7.5mm_W2.5mm_P5.00mm | C17 |
| 1 | 10UF 10uf | CP_Radial_D4.0mm_P2.00mm | C19 |
| 1 | 10uf 16v | CP_Radial_D4.0mm_P2.00mm | C23 |
| 2 | 100UF 100uf | CP_Radial_D4.0mm_P2.00mm | C26, C63 |
| 1 | 56PF 56pf | C_Disc_D7.5mm_W2.5mm_P5.00mm | C30 |
| 2 | 0.1uf | C_Disc_D7.5mm_W2.5mm_P5.00mm | C33, C49 |
| 1 | 25UF 25uf | C_Disc_D7.5mm_W2.5mm_P5.00mm | C35 |
| 1 | 47UF 47uf | CP_Radial_D4.0mm_P2.00mm | C36 |
| 1 | 100PF 100pf | C_Disc_D7.5mm_W2.5mm_P5.00mm | C37 |
| 1 | 470PF 470pf | C_Disc_D7.5mm_W2.5mm_P5.00mm | C44 |
| 2 | 4.7UF 4.7uf | CP_Radial_D4.0mm_P2.00mm | C58, C64 |
| 1 | 47P 47p | C_Disc_D7.5mm_W2.5mm_P5.00mm | C67 |
| 1 | 10nf | C_Disc_D7.5mm_W2.5mm_P5.00mm | C68 |
| 1 | 8-70PF 8-70pf - Floppy Adjust | c_trimmer-10 | C77 |
| 1 | 10NF 10nf | C_Disc_D7.5mm_W2.5mm_P5.00mm | C78 |
| 1 | 100R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 11 | 4K7 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R14, R24, R25, R65, R66, R67, R68 +3 |
| 1 | 470R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 1 | 220R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R4 |
| 1 | 8K2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
| 3 | 470 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6, R31, R85 |
| 2 | 390 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7, R12 |
| 1 | 5.6K 5.6k | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8 |
| 6 | 10K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9, R11, R15, R16, R26, R28 |
| 8 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R10, R18, R27, R41, R44, R49, R50, R64 |
| 1 | 820 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R13 |
| 3 | 100K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R17, R32, R42 |
| 1 | 6K8 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R19 |
| 2 | 56K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R20, R21 |
| 1 | 1M5 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R22 |
| 1 | 15K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R23 |
| 1 | 10M | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R29 |
| 1 | 420 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R30 |
| 1 | 160K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R33 |
| 1 | 330K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R34 |
| 1 | 80K6 1% | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R35 |
| 1 | 40K2 1% | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R36 |
| 1 | 20K 1% | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R37 |
| 1 | 10K 1% | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R38 |
| 1 | 68K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R39 |
| 1 | 33K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R40 |
| 1 | 750 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R43 |
| 4 | 150 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R45, R46, R47, R48 |
| 11 | 22R | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R73, R74, R75, R76, R77, R78, R79, R80 +3 |
Dragon64 design files
The KiCad project lives in the danwerner21/Dragon64 repository on GitHub; these links point at the commit this page was built from.
Dragon64: common questions
How big is the Dragon64 PCB?
The Dragon64 measures 333.2 × 205.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Dragon64?
220 components, from 105 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Dragon64 design files?
From the danwerner21/Dragon64 repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Dragon64 design in my own project?
The repository has no license, so all rights stay with danwerner21. Use it as a reference, and ask the author before reusing the design.
