RC6502 ROM
About the RC6502 ROM PCB
RC6502 ROM 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 × 54.6 mm, with 14 components from 11 distinct parts.
Other key parts include the 28C256 and 74HCT00. By type, the board carries 5 jumpers, 3 ICs, 3 capacitors, 2 resistors and 1 connector.
It belongs with the retro computing designs in this gallery.
From the project
An expandable SBC-version of the Apple 1 computer, easy to get started with and lot of cool stuff that can be added to it!
The original Apple 1 computer only came with 256 bytes of ROM (Read Only Memory), the bulk of this taken up by the included machine monitor later dubbed WozMon. The machine monitor in itself was written by Wozniak himself by manually entering the data corresponding to the various 6502 instructions and operands byte by byte, mainly because he did not have a computer and the software available to even write assembly level code! An amazing performance by todays standards, though not entirely unheard of in those days since most software was only available for equipment most couldn't even get…
Main components on the RC6502 ROM
RC6502 ROM bill of materials (BOM)
14 components, 11 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 28C256 | DIP-28_W15.24mm_Socket_LongPads | U1 |
| 2 | 74HCT00 | DIP-14_W7.62mm_Socket | U2, U3 |
| 1 | CONN_01X39 | Pin_Header_Angled_1x39_Pitch2.54mm | J1 |
| 1 | A13 Select | Pin_Header_Straight_1x03_Pitch2.54mm | JP1 |
| 1 | A14 Select | Pin_Header_Straight_1x03_Pitch2.54mm | JP2 |
| 1 | Page PullDown | Pin_Header_Angled_1x02_Pitch2.54mm | JP3 |
| 1 | Bus enable | Pin_Header_Angled_1x02_Pitch2.54mm | JP4 |
| 1 | Page mode | Pin_Header_Straight_1x03_Pitch2.54mm | JP5 |
| 3 | 100nF | C_Disc_D4.7mm_W2.5mm_P5.00mm | C1, C2, C3 |
| 1 | 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 3.3k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
RC6502 ROM design files
The KiCad project lives in the tebl/RC6502-Apple-1-Replica repository on GitHub; these links point at the commit this page was built from.
RC6502 ROM: common questions
How big is the RC6502 ROM PCB?
The RC6502 ROM measures 99.1 × 54.6 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the RC6502 ROM?
14 components, from 11 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 RC6502 ROM design files?
From the tebl/RC6502-Apple-1-Replica repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the RC6502 ROM design in my own project?
Yes, under the terms of its GPL-3.0 license, which tebl chose for the repository.
More boards in RC6502-Apple-1-Replica
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AVR/ArduinoRC6502 Apple 1 SBC
99.1 × 99.7 mm48 parts2LGPL-3.0192
RC6502 TIA NTSC
99.1 × 69.2 mm45 parts2LGPL-3.0192
AVR/ArduinoRC6502 Terminal
99.1 × 81.9 mm45 parts2LGPL-3.0192
RC6502 Joystick
99.1 × 61.6 mm44 parts2LGPL-3.0192
RC6502 Prototyping
99.1 × 99.7 mm43 parts2LGPL-3.0192
RC6502 VDU
99.1 × 99.7 mm37 parts2LGPL-3.0192
RC6502 PSG
99.1 × 54.6 mm28 parts2LGPL-3.0192
RC6502 RIOT
99.1 × 69.2 mm26 parts2LGPL-3.0192
RC6502 RAM
99.1 × 54.6 mm23 parts2LGPL-3.0192
AVR/ArduinoRC6502 Serial IO
99.1 × 66 mm21 parts2LGPL-3.0192
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