2 layers99.1 × 99.1 mm
Computer
rjw57/simplest-80s-computer
This is my rough scratch repo where I keep experiments to do with desiging 80s computer peripherals. It is not in any sensible shape to be used by others yet, apologies.
39 parts
2 layers99.1 × 99.1 mm
This is my rough scratch repo where I keep experiments to do with desiging 80s computer peripherals. It is not in any sensible shape to be used by others yet, apologies.
- Size
- 99.1 × 99.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 45
- Nets
- 81
- Pads
- 406
- Tracks, vias
- 0, 0
- Routed
- Not yet
- KiCad
- KiCad 5 (file 20171130)
- Created
- 15 Apr 2018
- Updated
- 28 Jul 2018
Overview
Vga is an open-source printed circuit board by rjw57, from the rjw57/simplest-80s-computer repository on GitHub. It is a 2-layer board of 99.1 × 99.1 mm with 45 parts on 81 nets.
It is built around the ATMEGA328-PU, 74HC245D and 74HC574D, with the 74HC74D, 74HC590D and 74HC00D among its other parts. Its parts include 19 capacitors, 17 ICs, 4 connectors, 2 resistors and 1 diode. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
9
ATMEGA328-PU
PDIP-28-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH PDIP-28 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
74HC245D
SO-20-300mil-40℃~+125℃ 1 160uA 2V~6V 7.8mA 7.8mA 74HC 8 9ns@4.5V,50pF Bidirectional Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers74HC574D
SOP-20L-40℃~+125℃ 1 13ns 15ns@6V,50pF 2.7V~6V 20uA 28MHz 5ns 6.5pF 7.8mA 7.8mA 74HC Series 8 D-Type Enable Rising Edge Tri-State SOP-20L Flip Flops ROHSMDDFlip Flops
74HC74D
SOIC-14-40℃~+125℃ 1 15ns 2 2V~6V 3.5pF 37ns@6V,50pF 3ns、3ns、3ns 40uA 5.2mA 5.2mA 74HC Series 82MHz Asynchronous Complementary D-Type Rising Edge Set and Reset SOIC-14 Flip Flops ROHSNexperiaFlip Flops
74HC590D
SO-16-40℃~+125℃ 1 15ns 2V~6V 61MHz 8 Asynchronous Divide-by-2 Rising Edge Up Counter SO-16 Counters, Dividers ROHSNexperiaCounters, Dividers74HC00D
SOP-14-40℃~+125℃ 1.5V、3.15V、4.2V 1.9V、3.7V、5.9V 100mV、400mV、400mV 2 2V~6V 4 40uA 5.2mA 5.2mA 500mV~1.8V 74HC Series 7ns@6V,50pF NAND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates74HC04D
SOP-14-40℃~+125℃ 1 1.5V~4.2V 1.9V、3.7V、5.2V 100mV、400mV、400mV 14ns@6V,50pF 2V~6V 2uA 5.2mA 5.2mA 500mV~1.8V 6 74HC SOIC-14 Inverters ROHSNexperiaInverters
74HC161S
SOP-160℃~+70℃ 20MHz 2V~6V 4 500mW Asynchronous Hexadecimal Counter Rising Edge Synchronous Up Counter SOP-16 Counters, Dividers ROHSGRCounters, Dividers74HC166D
SOP-16LSOP-16L Shift Registers ROHSMDDShift Registers
README
README.mdExperimental repo for retro computing
This is my rough scratch repo where I keep experiments to do with desiging 80s computer peripherals. It is not in any sensible shape to be used by others yet, apologies.
Parts
45| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | 100n | Capacitor_THT:C_Disc_D3.4mm_W2.1mm_P2.50mm | C1, C2, C3, C4, C5, C6, C7, C8, C10, C11, C12, C13, C14, C15, C16, C17 +1 |
| 4 | 74HC574 | Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm | U10, U14, U15, U17 |
| 3 | 74HC74 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1, U5, U6 |
| 2 | 74HC590 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U12, U13 |
| 1 | 100R | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R2 |
| 1 | 100µ | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C19 |
| 1 | 10µ | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C18 |
| 1 | 470R | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1 |
| 1 | 74HC00 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U3 |
| 1 | 74HC04 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U4 |
| 1 | 74HC161 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U9 |
| 1 | 74HC166 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U11 |
| 1 | 74HC245 | Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm | U8 |
| 1 | 74LS138 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U16 |
| 1 | ATmega328-PU | Package_DIP:DIP-28_W7.62mm_Socket | U2 |
| 1 | BUS | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J4 |
| 1 | CY7C199 | Package_DIP:DIP-28_W7.62mm_Socket | U7 |
| 1 | DOTCLK | Oscillator:Oscillator_DIP-8 | X1 |
| 1 | ISP | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J1 |
| 1 | LED | LED_THT:LED_D5.0mm | D1 |
| 1 | PWR | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | R_Network08 | Resistor_THT:R_Array_SIP9 | RN1 |
| 1 | VGA | Connector_Dsub:DSUB-15-HD_Female_Horizontal_P2.29x1.98mm_EdgePinOffset3.03mm_Housed_MountingHolesOffset4.94mm | J3 |
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Questions
How big is the Vga PCB?
It measures 99.1 × 99.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Vga use?
45 parts, built around the ATMEGA328-PU, 74HC245D, 74HC574D and 74HC74D. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Vga KiCad files?
From the rjw57/simplest-80s-computer repository on GitHub, at the commit this page was made from: the board is vga/hw/vga/vga.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Vga design in my own project?
Its repository states no licence, so its author keeps all rights: ask rjw57 before reusing the design.