2 layers333.2 × 205.9 mm
2 layers150.4 × 90.9 mm
BBCMicro128KRomRam
CyberspiceHardware/BBCMicro128KRomRam5A 128K RAM sideways ROM/RAM board for the BBC Micro model B
- Size
- 150.4 × 90.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 35
- Nets
- 74
- Pads
- 356
- Tracks, vias
- 1,743, 134
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 21 May 2022
- Updated
- 22 May 2022
Overview
BBCMicro128KRomRam is an open-source printed circuit board by CyberspiceHardware, from the CyberspiceHardware/BBCMicro128KRomRam repository on GitHub, published under the MIT licence. It is a 2-layer board of 150.4 × 90.9 mm with 35 parts on 74 nets, routed with 1,743 tracks and 134 vias.
It is built around the 27C128-15, 74LS00SC and 74LS139PC, with the 74LS174DC, 74LS27P-E and 74LS30PC among its other parts. Its parts include 12 capacitors, 12 ICs, 7 connectors and 3 resistors.
Main components
627C128-15
-0℃~+70℃ 128Kbit 4.5V~5.5V Parallel Port (Parallel) - Non-Volatile Memory (ROM)Microchip TechnologyNon-Volatile Memory (ROM)
74LS00SC
-0℃~+70℃ 15ns@5V,50pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA NAND Gate - Logic Gates ROHSTexas InstrumentsLogic Gates
74LS139PC
PDIP-1622ns 74LS 8mA Decoder Single Supply PDIP-16 Signal Switches, Multiplexers, DecodersonsemiSignal Switches, Multiplexers, Decoders
74LS174DC
-0ns 0℃~+70℃ 1 16mA 20ns 30MHz 30ns@5V,15pF 4.75V~5.25V 400uA 6 74LS Series 8mA Asynchronous Push-Pull Reset Rising Edge - Flip Flops ROHSonsemiFlip Flops
74LS27P-E
DIP-14-20℃~+75℃ 15ns@5V,15pF 2.7V 2V 3 3 400mV、500mV 74LS 800mV NOR Gate DIP-14 Logic Gates ROHSRenesas ElectronicsLogic Gates74LS30PC
PDIP-140℃~+70℃ 1 1.1mA 18ns@5V,50pF、20ns@5V,50pF 2.7V 2V 4.75V~5.25V 400uA 500mV 74LS Series 8 800mV 8mA NAND Gate PDIP-14 Logic GatesTexas InstrumentsLogic Gates
README
README.md128K Sideways ROM/RAM expansion for the BBC Micro
Parts
35| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 100nF | Capacitor_THT:C_Disc_D7.5mm_W2.5mm_P5.00mm | C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12 |
| 4 | 27C128 | Package_DIP:DIP-28_W15.24mm_Socket | U2, U3, U4, U5 |
| 4 | Hdr | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1, J2, J3, J4 |
| 3 | 3K3 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3 |
| 2 | 74LS00 | Package_DIP:DIP-14_W7.62mm_Socket | U9, U10 |
| 1 | 10uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C1 |
| 1 | 74LS139 | Package_DIP:DIP-16_W7.62mm_Socket | U12 |
| 1 | 74LS174 | Package_DIP:DIP-16_W7.62mm_Socket | U11 |
| 1 | 74LS27 | Package_DIP:DIP-14_W7.62mm_Socket | U8 |
| 1 | 74LS30 | Package_DIP:DIP-14_W7.62mm_Socket | U7 |
| 1 | AS6C1024 | Package_DIP:DIP-32_W15.24mm_Socket | U6 |
| 1 | Hdr | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J5 |
| 1 | Hdr | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Horizontal | CON2 |
| 1 | Pins | Package_DIP:DIP-40_W15.24mm_Socket | CON1 |
| 1 | W65C02SxP | Package_DIP:DIP-40_W15.24mm_Socket | U1 |
The 34 most common of 35 parts.
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Questions
How big is the BBCMicro128KRomRam PCB?
It measures 150.4 × 90.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the BBCMicro128KRomRam use?
35 parts, built around the 27C128-15, 74LS00SC, 74LS139PC and 74LS174DC. 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 BBCMicro128KRomRam KiCad files?
From the CyberspiceHardware/BBCMicro128KRomRam repository on GitHub, at the commit this page was made from: the board is KiCad/BBCMicro128KRomRam.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the BBCMicro128KRomRam design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).