4 layers122 × 92 mm
Xosera
SmallRobot2000/AMIX-68k
Motorola 68010 based sbc with IDE, keyboard, DMA, PIT, Xosera & more!
46 parts1
4 layers333.4 × 149.9 mm
Amix 68k (r0)
SmallRobot2000/AMIX-68k1Motorola 68010 based sbc with IDE, keyboard, DMA, PIT, Xosera & more!
- Size
- 333.4 × 149.9 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 175
- Nets
- 339
- Pads
- 1,355
- Tracks, vias
- 6,312, 548
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 29 Jul 2025
- Updated
- 17 Oct 2025
Overview
Amix 68k (r0) is an open-source printed circuit board by SmallRobot2000, from the SmallRobot2000/AMIX-68k repository on GitHub. It is a 4-layer board of 333.4 × 149.9 mm with 175 parts on 339 nets, routed with 6,312 tracks and 548 vias.
It is built around the 74HC245D, 74HCT245 and FT232RL, with the AS6C4008-55PCN, 74HC14 and 74HC373D among its other parts. Its parts include 33 capacitors, 31 ICs, 30 resistors, 28 connectors and 12 diodes. It belongs with the retro computing and games boards and the FPGA and CPLD boards of this library.
Main components
10
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, Transceivers
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
FT232RL
SSOP-28-208mil-40℃~+85℃ 3.3V~5.25V、4V~5.25V USB 2.0 USB to UART SSOP-28-208mil USB Converters ROHSFTDIUSB Converters
AS6C4008-55PCN
PDIP-320℃~+70℃ 2.7V~5.5V 30mA 4Mbit 4uA 55ns Parallel Port (Parallel) PDIP-32 SRAM ROHSAlliance MemorySRAM
74HC14
SOP-14-40℃~+85℃ 1.9V、3.98V、4.4V、5.48V、5.9V 100mV、260mV、260mV 20uA 25ns@4.5V,50pF 2V~6V 6 74HC Noise suppression function Schmitt trigger SOP-14 Inverters ROHSJSMSEMIInverters74HC373D
SOIC-20-300mil-40℃~+125℃ 10ns 12ns 2V~6V 5ns 7.8mA 7.8mA 74HC 8 8uA D Latch Tri-State SOIC-20-300mil Latches ROHSNexperiaLatches74HC74D
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
74LS148P-E
DIP-16-20℃~+75℃ 10mA 15ns@5V,15pF 4.75V~5.25V 400uA 74LS 8mA Decoder DIP-16 Signal Switches, Multiplexers, Decoders ROHSRenesas ElectronicsSignal Switches, Multiplexers, Decoders
74LS32SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates
LM1117T-3.3
TO-220-3L-40℃~+125℃@(Tj) 0.003%Vout 1 1.25V@(1A) 10mA 15V 1A 3.3V 75dB@(120Hz) Fixed Over Current Protection、Thermal shutdown Positive TO-220-3L Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSHGSEMIVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdAMIX-68k
This is my Motorola 68010 CPU based system. I plan to make it with 68010 CPU @ 12Mhz, DMA(68450) and othere periferials @ 10Mhz, IDE disk (CF card or good old HDD), Video output (Xosera), Aduio output (Aslo Xosera), Timers (again Xosera and 68230), Keyboard (68230 with RC2014 Yellow series MSX style keyboard), UART (16550 @ 115200 bps)
This isn't my first or (hopefully)last Retro style computer system, I alredy made two 6502 based computers, 8088 based system that is IBM compatable with 8 bit ISA, and built and coded for a handfull of z80/z180 based systems, mostly two RC2014 (Its funny that i like z80 MUCH more than 6502 but never made a system araund z80). And also have ZX Spectrum 48k and ZX Spectrum NEXT.
But somehow this is the first time working with 68k chip, I known for 68k style systems but was afraid to touch them because they are two times more complex thatn 8 bit(right?) especely when i made 8088 system that was 8/16 bit and coudnt think how complecated would a full 16 bit system be, but when i looked closer at Motorola 68000 i thought i steped in to heven because of all the documentation and datasheet, and how a SINGLE datasheet was enough to understand almost everything to know(looking at you Intel).
SPECS
| CPU | Motorola 68010 @ 12Mhz |
|---|---|
| RAM | 2 MB SRAM (Maybe DRAM in future) |
| DMA | 68450 @ 10 Mhz |
| VIDEO & AUDIO | Xosera 640x480 2 playfields and Copper ( ͡❛ ͜ʖ ͡❛) |
| Keyboard | RC2014 Yellow series MSX style keyboard with n key rollover |
| DISK | IDE interface CF card or clasic HDD |
| UART | 16550 @ 18.432 Mhz -> 115200 bps |
| POWER | ATX PSU or 12V in |
| TIME & TIMERS | Tmers in Xosera and 68230, and RTC (SparkFun BOB-10160) |
Present
All important stuff in kernel is done, now its time to make a unix like shell inside the kernel, later I will make it a executable file All executables are in ELF file format, scripts are not yet suported nether are pipes and redirects.
Future (TODO)
- Add working permissions and thus users
- Shell as executable not built in kenrel
- Support for pipes and redirects
- Move keyboard to a new process and make it all in C because now it sometimes glitches
- Clean up code and make more flexiable(cariables insted of defines)
- Move some stuff to files like history and $PATH etc.
- Add global sbrk with suport for freeing all alocations per process when killed
- When poritng keyboard to C add some shortcuts
- add system specific command something similar to symctl
- add Ethernet as expantion
Parts
175| Qty | Value | Footprint | References |
|---|---|---|---|
| 23 | 100nF | Capacitor_THT:C_Rect_L4.0mm_W2.5mm_P2.50mm | C10, C11, C12, C13, C14, C15, C16, C17, C18, C21, C22, C23, C24, C25, C26, C27 +7 |
| 9 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3, R4, R16, R18, R19, R20, R21, R22, R30 |
| 8 | R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5, R6, R7, R8, R9, R10, R11, R12 |
| 7 | HOLE | My_Components:Hole_3mm | HOLE1, HOLE2, HOLE3, HOLE4, HOLE5, HOLE6, HOLE7 |
| 5 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R14, R15, R17 |
| 4 | AS6C4008-55PCN | Package_DIP:DIP-32_W15.24mm_Socket_LongPads | U4, U5, U6, U7 |
| 4 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J11, J12, J15, J27 |
| 4 | GAL16V8 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | U3, U10, U11, U12 |
| 4 | Jumper | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP3, JP4, JP5, JP6 |
| 4 | Jumper_2_Open | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP1, JP2, JP8, JP21 |
| 4 | LED | LED_THT:LED_D4.0mm | D3, D4, D5, D6 |
| 4 | R_Network07 | Resistor_THT:R_Array_SIP8 | RN1, RN2, RN3, RN4 |
| 3 | 10uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C3, C5, C7 |
| 3 | 1uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C4, C6, C33 |
| 3 | 330 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R27, R28, R29 |
| 3 | 74HC245 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | U19, U20, U21 |
| 3 | 74HCT245 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | IC1, IC2, IC3 |
| 3 | Jumper_3_Bridged12 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP7, JP19, JP22 |
| 2 | 150k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13, R24 |
| 2 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D7, D8 |
| 2 | 2N3904 | Package_TO_SOT_THT:TO-92_Inline | Q1, Q2 |
| 2 | 680 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R25, R26 |
| 2 | 74HC14 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U2, U27 |
| 2 | 74HC373 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | U22, U23 |
| 2 | 74HC74 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U16, U28 |
| 2 | Close only if NO ATX | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP10, JP11 |
| 2 | Conn_01x08_Pin | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J23, J24 |
| 2 | Conn_02x04_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical | J25, J26 |
| 2 | D | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2 |
| 2 | DTACK ctrl 0 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP14, JP15 |
| 2 | Jumper_2_Bridged | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP18, JP20 |
| 2 | SST39SF040 | Socket:DIP_Socket-32_W11.9_W12.7_W15.24_W17.78_W18.5_3M_232-1285-00-0602J | U8, U9 |
| 1 | 1-2 3 - > Always ON, 1 2-3 -> Enabled On/Off | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP9 |
| 1 | 1.8432Mhz | Oscillator:Oscillator_DIP-14 | Y1 |
| 1 | 100uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C19 |
| 1 | 10Mhz | Oscillator:Oscillator_DIP-14 | Y5 |
| 1 | 12Mhz | Oscillator:Oscillator_DIP-14 | Y3 |
| 1 | 12V in if NO ATX | Connector_BarrelJack:BarrelJack_Horizontal | J17 |
| 1 | 16550 | Package_DIP:DIP-40_W15.24mm_Socket_LongPads | U13 |
| 1 | 1uF | Capacitor_THT:C_Rect_L4.0mm_W2.5mm_P2.50mm | C2 |
| 1 | 220uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C20 |
| 1 | 470 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R23 |
| 1 | 68230 | Package_DIP:DIP-48_W15.24mm_Socket_LongPads | U26 |
| 1 | 74LS148 | Package_DIP:DIP-16_W7.62mm_Socket_LongPads | U25 |
| 1 | 74LS32 | Package_DIP:DIP-14_W7.62mm_Socket_LongPads | U24 |
| 1 | ATX-24 - IF NO 12V in | Connector_Molex:Molex_Mini-Fit_Jr_5566-24A2_2x12_P4.20mm_Vertical | J16 |
| 1 | BG | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | BUS_STAT | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J4 |
| 1 | C_Polarized | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C1 |
| 1 | Conn_01x06_Pin | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J8 |
| 1 | Conn_02x08_Odd_Even | Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical | J21 |
| 1 | Conn_02x32_Odd_Even | Connector_PinSocket_2.54mm:PinSocket_2x32_P2.54mm_Horizontal | J28 |
| 1 | DMAAC_ACK0 = IDE | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP17 |
| 1 | DMAAC_REQ0 = IDE | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP16 |
| 1 | DMAC CLK | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP12 |
| 1 | DTACK_Pull UP/DOWN | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP13 |
| 1 | ExtPWRON | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J19 |
| 1 | FCx | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J2 |
| 1 | FT232RL | Package_SO:SSOP-28_5.3x10.2mm_P0.65mm | U14 |
| 1 | HLT and RESET | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J5 |
| 1 | IDE 40 pin | Connector_IDC:IDC-Header_2x20_P2.54mm_Vertical | J18 |
| 1 | LED_+12 | LED_THT:LED_D4.0mm | D9 |
| 1 | LED_+5 | LED_THT:LED_D4.0mm | D10 |
| 1 | LED_+5SB | LED_THT:LED_D4.0mm | D11 |
| 1 | LED_-12 | LED_THT:LED_D4.0mm | D12 |
| 1 | LM1117T-3.3 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | U17 |
| 1 | LM7805_TO220 | Package_TO_SOT_THT:TO-220-3_Horizontal_TabDown | U15 |
| 1 | MC68010P | Package_DIP:DIP-64_W22.86mm_Socket_LongPads | U1 |
| 1 | MC68450 | Package_DIP:DIP-64_W22.86mm_Socket_LongPads | U18 |
| 1 | NMI | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J29 |
| 1 | PMOD_BOTTOM | Connector_PinSocket_2.54mm:PinSocket_2x06_P2.54mm_Horizontal | J10 |
| 1 | PMOD_TOP | Connector_PinSocket_2.54mm:PinSocket_2x06_P2.54mm_Horizontal | J9 |
| 1 | PPI | Connector_PinHeader_2.54mm:PinHeader_1x12_P2.54mm_Vertical | J22 |
| 1 | PRF | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J3 |
| 1 | PWR_LED | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J20 |
| 1 | RTC (SparkFun BOB-10160) | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J13 |
| 1 | Reset | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | SW_SPDT | Button_Switch_THT:SW_Slide_SPDT_Angled_CK_OS102011MA1Q | SW3 |
| 1 | USB_B | Connector_USB:USB_B_Lumberg_2411_02_Horizontal | J14 |
| 1 | Upduino_LHS | Connector_PinHeader_2.54mm:PinHeader_1x24_P2.54mm_Vertical | J6 |
The 174 most common of 175 parts.
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Questions
How big is the Amix 68k (r0) PCB?
It measures 333.4 × 149.9 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Amix 68k (r0) use?
175 parts, built around the 74HC245D, 74HCT245, FT232RL and AS6C4008-55PCN. 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 Amix 68k (r0) KiCad files?
From the SmallRobot2000/AMIX-68k repository on GitHub, at the commit this page was made from: the board is amix 68k r1/amix 68k (r0).kicad_pcb and its schematic amix 68k r0/CAPsheet.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Amix 68k (r0) design in my own project?
Its repository states no licence, so its author keeps all rights: ask SmallRobot2000 before reusing the design.