RC1802 CPU
About the RC1802 CPU PCB
RC1802 CPU is an open source PCB design by tebl, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 99.1 × 99.1 mm, with 54 components from 26 distinct parts.
Other key parts include the 74LS04, CDP1802, 74LS240, 74LS373 and SLOT-1. By type, the board carries 15 resistors, 9 connectors, 9 diodes, 8 jumpers, 6 ICs and 6 capacitors.
It belongs with the retro computing designs in this gallery.
From the project
With the RC6502-project for making an Apple 1 replica done I wanted to do something different, so I started designing a simple version of the RCA 1802-based Cosmac ELF instead.
Of the two main modules needed for the RC1802 Cosmac ELF computer, this is the main board that includes the RCA 1802 processor along with any RAM and ROM you want. In other words this is the brains of the whole operation! In theory this board by itself should be able to function by itself though the validity of this claim is still lacking some actual testing.
Main components on the RC1802 CPU
RC1802 CPU bill of materials (BOM)
54 components, 26 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74LS04 | DIP-14_W7.62mm_Socket | U1 |
| 1 | CDP1802 | DIP-40_W15.24mm_Socket | U2 |
| 1 | 74LS240 | DIP-20_W7.62mm_Socket | U3 |
| 1 | 74LS373 | DIP-20_W7.62mm_Socket | U4 |
| 1 | SLOT-1 | DIP-28_W15.24mm_Socket | U5 |
| 1 | SLOT-2 | DIP-28_W15.24mm_Socket | U6 |
| 1 | CXO_DIP14 | Oscillator_DIP-14 | X1 |
| 4 | Mount | 1pin | J1, J2, J3, J4 |
| 1 | Expansion | Pin_Header_Angled_1x39_Pitch2.54mm | J5 |
| 1 | UI_Connector | Pin_Header_Straight_2x20_Pitch2.54mm | J6 |
| 1 | BARREL_JACK | BARREL_JACK | J7 |
| 1 | ClockPort | Pin_Header_Straight_1x05_Pitch2.54mm | J8 |
| 1 | Q_Connector | Pin_Header_Angled_1x05_Pitch2.54mm | J9 |
| 1 | RX_SEL | Pin_Header_Straight_1x03_Pitch2.54mm | JP1 |
| 1 | HI | Pin_Header_Straight_1x03_Pitch2.54mm | JP2 |
| 1 | LO | Pin_Header_Straight_1x03_Pitch2.54mm | JP3 |
| 1 | SLOT2_WE | Pin_Header_Straight_1x03_Pitch2.54mm | JP4 |
| 1 | SLOT1_WE | Pin_Header_Straight_1x03_Pitch2.54mm | JP5 |
| 1 | BM_OE | Pin_Header_Straight_1x03_Pitch2.54mm | JP6 |
| 1 | RX_INVERT | Pin_Header_Straight_1x03_Pitch2.54mm | JP7 |
Show 6 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TX_INVERT | Pin_Header_Straight_1x03_Pitch2.54mm | JP8 |
| 8 | LED_Small | LED_D5.0mm | D1, D2, D3, D4, D5, D6, D7, D8 |
| 1 | 1N4148 | D_DO-35_SOD27_P7.62mm_Horizontal | D9 |
| 6 | 100nF | C_Disc_D4.7mm_W2.5mm_P5.00mm | C1, C2, C3, C4, C5, C6 |
| 7 | 47k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3, R4, R5, R6, R7 |
| 8 | 220 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8, R9, R10, R11, R12, R13, R14, R15 |
RC1802 CPU design files
The KiCad project lives in the tebl/RC1802-Cosmac-ELF repository on GitHub; these links point at the commit this page was built from.
RC1802 CPU: common questions
How big is the RC1802 CPU PCB?
The RC1802 CPU measures 99.1 × 99.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the RC1802 CPU?
54 components, from 26 distinct parts. The full bill of materials is listed on this page.
Where can I download the RC1802 CPU design files?
From the tebl/RC1802-Cosmac-ELF repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the RC1802 CPU design in my own project?
Yes, under the terms of its GPL-3.0 license, which tebl chose for the repository.
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