Dragon32Issue2
About the Dragon32Issue2 PCB
Dragon32Issue2 is an open source PCB design by jimbro1000, published on GitHub under the MIT license. It is a 2-layer board measuring 253 × 169.1 mm, with 206 components from 97 distinct parts.
Other key parts include the HYB4116, LM1889N, 2318, MC14053 and MC6847. By type, the board carries 70 resistors, 62 capacitors, 35 ICs, 9 diodes, 7 jumpers and 4 inductors.
From the project
Recreation of early Dragon 32 mainboard
This project is a recreation of the SA2120 CPU Mainboard for the 1982 Dragon Data Dragon 32
Everything (excluding modifications) is taken from the SA2120 schematics. Component positioning is as close to the original too. The DRAM positions are as close as possible to the 1982 board but in preference use 4164s instead and set the memory configuration jumpers appropriately, this avoids transplanting a riser board to use the 16x16k configuration. The 16x16k should still work of course...
Main components on the Dragon32Issue2
Dragon32Issue2 bill of materials (BOM)
206 components, 97 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 8 | HYB4116 | DIP-16_W7.62mm | IC1, IC2, IC3, IC4, IC5, IC6, IC7, IC8 |
| 1 | LM1889N | DIP-18_W7.62mm | IC9 |
| 1 | 2318 | DIP-8_W7.62mm | IC10 |
| 1 | MC14053 | DIP-16_W7.62mm | IC11 |
| 1 | MC6847 | DIP-40_W15.24mm | IC12 |
| 1 | 74LS273N | DIP-20_W7.62mm | IC13 |
| 1 | 74LS86AN | DIP-14_W7.62mm | IC14 |
| 1 | MC6883 | DIP-40_W15.24mm | IC15 |
| 2 | 74LS244N | DIP-20_W7.62mm | IC16, IC24 |
| 2 | 68A364 | DIP-24_W15.24mm | IC17, IC18 |
| 1 | MC6809E | DIP-40_W15.24mm | IC19 |
| 1 | MC14529B | DIP-16_W7.62mm | IC20 |
| 1 | 74LS123N | DIP-16_W7.62mm | IC21 |
| 1 | 74LS00N | DIP-14_W7.62mm | IC22 |
| 1 | 74ALS74N | DIP-14_W7.62mm | IC23 |
| 1 | LM393P | DIP-8_W7.62mm | IC25 |
| 2 | MC6821 | DIP-40_W15.24mm | IC26, IC35 |
| 1 | 74LS20N | DIP-14_W7.62mm | IC27 |
| 2 | 74LS393N | DIP-14_W7.62mm | IC28, IC29 |
| 1 | 74LS32N | DIP-14_W7.62mm | IC30 |
Show 77 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74LS02N | DIP-14_W7.62mm | IC31 |
| 1 | 74LS390 | DIP-16_W7.62mm | IC32 |
| 1 | 74LS138N | DIP-16_W7.62mm | IC33 |
| 1 | MC14050BCP | DIP-16_W7.62mm | IC34 |
| 1 | 1 low | PinHeader_1x03_P2.54mm_Vertical | JP1-2 |
| 4 | 16k/32k | PinHeader_1x03_P2.54mm_Vertical | JP3-4, JP5-6, JP7-8, JP9-10 |
| 1 | printer/comms | PinHeader_1x03_P2.54mm_Vertical | JP11-12 |
| 1 | 32k/64k | PinHeader_1x03_P2.54mm_Vertical | JP13-14 |
| 1 | Dragon Keyboard | PinHeader_1x16_P2.54mm_Vertical | PL1 |
| 1 | Printer | IDC-Header_2x10-1MP_P2.54mm_Latch_Horizontal | PL2 |
| 1 | DIN-6 J/S R | DIN-6_DELTRON_671-0601_Horizontal | PL3 |
| 1 | DIN-5 (180) Cassette | DIN-5_DELTRON_671-0501_45deg_Horizontal | PL4 |
| 1 | DIN-6 J/S L | DIN-6_DELTRON_671-0601_Horizontal | PL5 |
| 1 | Power Board Interconnect | Molex_KK-396_A-41791-0009_1x09_P3.96mm_Vertical | PL6 |
| 1 | EDAC 392-040-558-201 | Edge_2x20_P2.54mm_OvalMP | PL7 |
| 1 | video | PinHeader_1x02_P2.54mm_Vertical | PL8 |
| 1 | CoCo Keyboard | PinHeader_1x16_P2.54mm_Vertical | PL9 |
| 1 | OJS HM FORM A | OJS HM 10A Relay | RL1 |
| 1 | 10K | Potentiometer_Bourns_3386X_Horizontal | RV1 |
| 1 | 470R | Potentiometer_Bourns_3386X_Horizontal | RV3 |
| 1 | RESET | Button_AlpsAlpine_SPUN190900 | SW1 |
| 1 | BC141 | TO-92_Inline_Wide | TR1 |
| 2 | 2N4401 | TO-92_Inline | TR2, TR3 |
| 1 | 2N3906 | TO-92_Inline | TR4 |
| 1 | 4.433619MHz | Crystal_HC49-U_Horizontal | XL1 |
| 1 | 14.31818MHz | Crystal_HC49-U_Horizontal | XL2 |
| 9 | 1N914 | D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2, D3, D4, D5, D6, D7, D8 +1 |
| 4 | 3.3uH | L_Axial_L7.0mm_D3.3mm_P10.16mm_Horizontal_Fastron_MICC | L1, L2, L3, L4 |
| 10 | 0.01uF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C8, C25, C38, C39, C43, C45, C58 +2 |
| 20 | 0.1uF | C_Disc_D4.3mm_W1.9mm_P5.00mm | C2, C4, C12, C14, C15, C16, C17, C18 +12 |
| 4 | 33pF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C3, C5, C41, C59 |
| 1 | 4.7pF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C6 |
| 1 | 2-22pF | Trimmer-7.5mm | C7 |
| 4 | 22pF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C9, C40, C48, C49 |
| 4 | 4.7uF | CP_Radial_D5.0mm_P2.50mm | C10, C11, C28, C37 |
| 3 | 10uF | CP_Radial_D5.0mm_P2.50mm | C13, C35, C42 |
| 2 | 100uF | CP_Radial_D6.3mm_P2.50mm | C22, C36 |
| 2 | 1uF | CP_Radial_D5.0mm_P2.50mm | C23, C29 |
| 1 | 47uF | CP_Radial_D5.0mm_P2.50mm | C24 |
| 1 | 2.2nF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C26 |
| 5 | 22nF | C_Disc_D5.0mm_W2.5mm_P5.00mm | C30, C31, C32, C33, C44 |
| 1 | 330pF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C34 |
| 2 | 180pF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C46, C71 |
| 1 | 100pF | C_Disc_D3.0mm_W2.0mm_P2.50mm | C47 |
| 1 | 100R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 5 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R5, R6, R49, R54 |
| 2 | 5K6 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R68 |
| 1 | 3K3 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 22K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R7 |
| 2 | 270R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8, R9 |
| 3 | 2K7 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10, R11, R65 |
| 11 | 22R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12, R19, R20, R21, R22, R23, R24, R25 +3 |
| 10 | 4K7 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13, R14, R30, R31, R32, R38, R39, R40 +2 |
| 3 | 100K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R15, R36, R64 |
| 1 | 33K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R16 |
| 6 | 10K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R17, R18, R42, R43, R55, R56 |
| 1 | 68K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R29 |
| 1 | 1K8 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R33 |
| 2 | 8K2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R34, R47 |
| 1 | 12K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R35 |
| 2 | 1K5 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R37, R66 |
| 1 | 27K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R44 |
| 1 | 6K8 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R45 |
| 1 | 220R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R46 |
| 1 | 15K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R48 |
| 2 | 56K | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R50, R52 |
| 1 | 1M5 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R51 |
| 1 | 10M | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R53 |
| 1 | 20K 1% | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R57 |
| 1 | 80K6 1% | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R58 |
| 1 | 160K 1% | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R59 |
| 1 | 330K 1% | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R60 |
| 1 | 40K2 1% | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R61 |
| 1 | 10K 1% | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R62 |
| 1 | 1K2 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R67 |
| 1 | 330R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R69 |
| 1 | 10R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R76 |
Dragon32Issue2 design files
The KiCad project lives in the jimbro1000/Dragon32Issue2 repository on GitHub; these links point at the commit this page was built from.
- LayoutDragon32.kicad_pcb
- SchematicDragon32.kicad_sch
Dragon32Issue2: common questions
How big is the Dragon32Issue2 PCB?
The Dragon32Issue2 measures 253 × 169.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Dragon32Issue2?
206 components, from 97 distinct parts. The full bill of materials is listed on this page.
Where can I download the Dragon32Issue2 design files?
From the jimbro1000/Dragon32Issue2 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Dragon32Issue2 design in my own project?
Yes, under the terms of its MIT license, which jimbro1000 chose for the repository.