4 layers106 × 89 mm
V9958video
rosco-m68k/hardware-projects
Supporting hardware, expansions and projects for the rosco_m68k
63 parts17MIT
4 layers80 × 110 mm
Mc68681-basic
rosco-m68k/hardware-projects17Supporting hardware, expansions and projects for the rosco_m68k
- Size
- 80 × 110 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 32
- Nets
- 132
- Pads
- 296
- Tracks, vias
- 814, 57
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 5 Apr 2020
- Updated
- 21 Dec 2023
Overview
Mc68681-basic is an open-source printed circuit board by rosco-m68k, from the rosco-m68k/hardware-projects repository on GitHub, published under the MIT licence. It is a 4-layer board of 80 × 110 mm with 32 parts on 132 nets, routed with 814 tracks and 57 vias.
It is built around the 74HCT245 and XR68C681CJTR-F. Its parts include 15 capacitors, 7 ICs, 4 connectors, 2 resistors and 1 transistor.
Main components
2
74HCT245
DIP-20-40℃~+85℃ 28ns@4.5V 4.5V~5.5V 6mA 6mA 74HCT 8 8uA Bidirectional TTL-compatible CMOS Tri-State DIP-20 Buffers, Drivers, Receivers, Transceivers ROHSWuxi I-core Elec74 Series
XR68C681CJTR-F
PLCC-44(16.59x16.59)-40℃~+85℃ 1Byte 1Mbps 2 5V Internal Oscillator、Low-power mode、Hardware flow control support、Automatic error detection PLCC-44(16.59x16.59) UART ROHSMaxLinearUART
README
README.mdHardware projects for rosco_m68k
This repository expansion boards and some simple hardware projects for the rosco_m68k (https://github.com/rosco-m68k/rosco_m68k).
If you are building your own expansions, see the memory map for details of the memory map, and how to reserve your address space.
Current contents
bus_board- This is theroscbus-01expansion bus board for the rosco_m68kioread-poc- A POC project that interfaces with an Arduino (Mega-2560)ram-expansion- Theroscram-011/2/3/4MB RAM expansion boardvideo9958- The V9958 video cardmc68681-duart- MC68681 Dual UART board
See the README.md files in the subdirectories for details of the indiviual things.
Parts
32| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 100nF | rosco_m68k:C2.5-3 | C1, C2, C4, C6, C7, C8, C9, C10, C11, C12, C15 |
| 3 | 74HCT245 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | IC2, IC3, IC4 |
| 2 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2 |
| 2 | 220uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C13, C14 |
| 2 | 7pF | Capacitor_THT:C_Rect_L7.0mm_W2.0mm_P5.00mm | C3, C5 |
| 1 | 74125 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | IC5 |
| 1 | Conn_02x05_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | JP1-5 |
| 1 | Conn_02x32_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x32_P2.54mm_Vertical | J1 |
| 1 | Crystal | Crystal:Crystal_HC49-4H_Vertical | Q1 |
| 1 | EXTBUS | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J2 |
| 1 | IC6_DECO.PLD | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | IC6 |
| 1 | IC7_UART_.PLD | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | IC7 |
| 1 | UART_A | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J3 |
| 1 | UART_B | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J4 |
| 1 | XR68C681CJTR-F | Package_LCC:PLCC-44_THT-Socket | IC1 |
The 30 most common of 32 parts.
Questions
How big is the Mc68681-basic PCB?
It measures 80 × 110 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Mc68681-basic use?
32 parts, built around the 74HCT245 and XR68C681CJTR-F. 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 Mc68681-basic KiCad files?
From the rosco-m68k/hardware-projects repository on GitHub, at the commit this page was made from: the board is mc68681-duart/design/kicad/mc68681-basic/mc68681-basic.kicad_pcb and its schematic RAM-hat-4MB/Rosco_Hat_RAM.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Mc68681-basic 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).
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