2 layers172.1 × 108 mm
Mb88-testboard
ifilot/morseboard-8088
Single board computer designed around the 8088 processor
81 parts
2 layers130.9 × 81.3 mm
Rambo
palazzol/TRS80_3D1- Size
- 130.9 × 81.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 43
- Nets
- 121
- Pads
- 385
- Tracks, vias
- 1,102, 139
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 27 Jul 2022
- Updated
- 4 Oct 2022
Overview
Rambo is an open-source printed circuit board by palazzol, from the palazzol/TRS80_3D repository on GitHub. It is a 2-layer board of 130.9 × 81.3 mm with 43 parts on 121 nets, routed with 1,102 tracks and 139 vias.
It is built around the 74LS245SC, 74LS139PC and AS6C4008-55PCN, with the 74HCT00D, 74HCT02D and 74HCT04D among its other parts. Its parts include 16 capacitors, 15 ICs, 3 connectors, 1 transistor and 1 switch.
Main components
874LS245SC
-0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
74LS139PC
PDIP-1622ns 74LS 8mA Decoder Single Supply PDIP-16 Signal Switches, Multiplexers, DecodersonsemiSignal Switches, Multiplexers, Decoders
AS6C4008-55PCN
PDIP-320℃~+70℃ 2.7V~5.5V 30mA 4Mbit 4uA 55ns Parallel Port (Parallel) PDIP-32 SRAM ROHSAlliance MemorySRAM
74HCT00D
SO-14-40℃~+125℃ 100mV、400mV 12ns@4.5V,50pF 2 2V 3.7V、4.4V 4 4.5V~5.5V 40uA 4mA 4mA 74HCT Series 800mV NAND Gate Overvoltage-tolerant input TTL Compatible CMOS SO-14 Logic Gates ROHSNexperiaLogic Gates74HCT02D
SO-14-40℃~+125℃ 19ns@4.5V,50pF 2 2V 2uA 3.7V 4 4.5V~5.5V 400mV 4mA 4mA 74HCT Series 800mV NOR Gate Overvoltage-tolerant input SOIC-14 Logic Gates ROHSNexperiaGates74HCT04D
SO-14-40℃~+125℃ 1 19ns@4.5V,50pF 2V 2uA 3.7V 4.5V~5.5V 400mV 4mA 4mA 6 74HCT 800mV SO-14 Inverters ROHSNexperiaInverters
74HCT273D
SOIC-20-300mil-40℃~+125℃ 12ns 3.5pF 30ns@4.5V,50pF 36MHz 3ns 4.5V~5.5V 4mA 5.2mA 74HCT Series 8 8uA D-Type Reset Rising Edge SOIC-20-300mil Flip Flops ROHSNexperiaFlip Flops
74LS85DC
CDIP-16-55℃~+125℃ 10mA 24ns Four channels TTL CDIP-16 Comparators ROHSTexas InstrumentsComparators
README
README.mdTRS80_3D
Stereo 3D graphics on a TRS-80 Model III
To be seen at Tandy Assembly 2022
RAMBO board - 1 Meg "RAMDisk"
Simulated Video - click to animate (YouTube link)
Parts
43| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 100nF | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15 |
| 5 | 74LS191 | Package_DIP:DIP-16_W7.62mm | U3, U4, U5, U6, U7 |
| 4 | MountingHole_3.2mm_M3 | MountingHole:MountingHole_3.2mm_M3 | h1, h2, h3, h4 |
| 2 | 74LS139 | Package_DIP:DIP-16_W7.62mm | U1, U15 |
| 2 | AS6C4008-55PCN | Package_DIP:DIP-32_W15.24mm | U8, U9 |
| 1 | 2N7000 | Package_TO_SOT_THT:TO-92_Inline | Q1 |
| 1 | 33uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C16 |
| 1 | 4.7K | Resistor_THT:R_Array_SIP5 | RN1 |
| 1 | 74HCT00 | Package_DIP:DIP-14_W7.62mm | U12 |
| 1 | 74HCT02 | Package_DIP:DIP-14_W7.62mm | U14 |
| 1 | 74HCT04 | Package_DIP:DIP-14_W7.62mm | U10 |
| 1 | 74HCT273 | Package_DIP:DIP-20_W7.62mm | U2 |
| 1 | 74LS245 | Package_DIP:DIP-20_W7.62mm | U11 |
| 1 | 74LS85 | Package_DIP:DIP-16_W7.62mm | U13 |
| 1 | Barrel_Jack_Switch | Connector_BarrelJack:BarrelJack_GCT_DCJ200-10-A_Horizontal | J1 |
| 1 | Conn_02x25_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x25_P2.54mm_Vertical | J3 |
| 1 | LOGO | Evan's misc parts:Evan Logo | G*** |
| 1 | LOGO | Evan's misc parts:OSHW gear | G*** |
| 1 | SW_DIP_x04 | Button_Switch_THT:SW_DIP_SPSTx04_Slide_9.78x12.34mm_W7.62mm_P2.54mm | SW1 |
| 1 | USB_B | Connector_USB:USB_B_OST_USB-B1HSxx_Horizontal | J2 |
Questions
How big is the Rambo PCB?
It measures 130.9 × 81.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Rambo use?
43 parts, built around the 74LS245SC, 74LS139PC, AS6C4008-55PCN and 74HCT00D. 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 Rambo KiCad files?
From the palazzol/TRS80_3D repository on GitHub, at the commit this page was made from: the board is rambo/rambo.kicad_pcb and its schematic rambo/rambo.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Rambo design in my own project?
Its repository states no licence, so its author keeps all rights: ask palazzol before reusing the design.
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