74 Character Generator
About the 74 Character Generator PCB
74 Character Generator is an open source PCB design by rjhelms, published on GitHub. It is a 4-layer board measuring 124.5 × 99.1 mm, with 77 components from 21 distinct parts.
Other key parts include the 74HC138, 74HC02, 74HC00, IDT7130 and 74HC08. By type, the board carries 30 capacitors, 23 ICs, 18 resistors, 5 connectors and 1 crystal.
It belongs with the retro computing designs in this gallery.
From the project
Homebrew 6502 system
A very much work-in-progress homebrew 6502 system.
Hardware is currently built off of a 6502 protoboard, available at https://github.com/rjhelms/6502proto.
All hardware CC-BY-SA 4.0. All software zlib license unless otherwise specified.
Main components on the 74 Character Generator
74 Character Generator bill of materials (BOM)
77 components, 21 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74HC138 | SOIC-16_3.9x9.9mm_P1.27mm | U1 |
| 3 | 74HC02 | SOIC-14_3.9x8.7mm_P1.27mm | U2, U16, U23 |
| 3 | 74HC00 | SOIC-14_3.9x8.7mm_P1.27mm | U3, U15, U21 |
| 1 | IDT7130 | DIP-48_W15.24mm_Socket_LongPads | U4 |
| 5 | 74HC08 | SOIC-14_3.9x8.7mm_P1.27mm | U5, U13, U14, U20, U22 |
| 1 | 74HC86 | SOIC-14_3.9x8.7mm_P1.27mm | U6 |
| 1 | 28C64 | DIP-28_W15.24mm_Socket_LongPads | U7 |
| 1 | 74HC166 | SOIC-16_3.9x9.9mm_P1.27mm | U8 |
| 6 | 74HC161 | SOIC-16_3.9x9.9mm_P1.27mm | U9, U10, U11, U17, U18, U19 |
| 1 | 74HC30 | SOIC-14_3.9x8.7mm_P1.27mm | U12 |
| 1 | 14.31818MHz | Oscillator_SMD_IQD_IQXO70-4Pin_7.5x5.0mm | X1 |
| 1 | Conn_Coaxial_Sleeve_Pin2Tip | Jack_RCA_Switchcraft_PJRAN1X1UxxX | J1 |
| 1 | Conn_01x02 | PinHeader_1x02_P2.54mm_Vertical | J2 |
| 2 | Conn_02x08_Odd_Even | IDC-Header_2x08_P2.54mm_Vertical | J5, J7 |
| 1 | Conn_02x04_Odd_Even | IDC-Header_2x04_P2.54mm_Vertical | J6 |
| 24 | 100n | C_0805_2012Metric | C1, C2, C3, C4, C5, C6, C7, C8 +16 |
| 1 | 10u | C_0805_2012Metric | C25 |
| 5 | 1u | C_0805_2012Metric | C26, C27, C28, C29, C30 |
| 2 | 3K3 | R_0805_2012Metric | R1, R2 |
| 1 | 470R | R_0805_2012Metric | R3 |
Show 1 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 15 | 1K | R_0805_2012Metric | R4, R5, R6, R7, R8, R9, R10, R11 +7 |
74 Character Generator design files
The KiCad project lives in the rjhelms/compe6502 repository on GitHub; these links point at the commit this page was built from.
74 Character Generator: common questions
How big is the 74 Character Generator PCB?
The 74 Character Generator measures 124.5 × 99.1 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the 74 Character Generator?
77 components, from 21 distinct parts. The full bill of materials is listed on this page.
Where can I download the 74 Character Generator design files?
From the rjhelms/compe6502 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the 74 Character Generator design in my own project?
The repository has no license, so all rights stay with rjhelms. Use it as a reference, and ask the author before reusing the design.
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