BITSY Mark I
About the BITSY Mark I PCB
BITSY Mark I is an open source PCB design by codesmythe, published on GitHub under the CC-BY-NC-4.0 license. It is a 4-layer board measuring 102 × 102 mm, with 55 components from 32 distinct parts.
Other key parts include the MC68HC000FN, MC68901, SST39SF040, SRAM_SIMM and MIC1232. By type, the board carries 17 capacitors, 13 ICs, 12 resistors, 5 connectors, 3 crystals and 2 jumpers.
It belongs with the retro computing and usb & debug tools designs in this gallery.
From the project
A Motorola 68000-based single board computer designed to run EmuTOS.
This board is designed to run the EmuTOS operating system. EmuTOS is an open-source variant of the Atari ST TOS operating system.
BITSY Mark I is part of system containing this board, a XOSERA_RCBUS board for VGA output, a KEMOJO board for PS/2 keyboard and mouse input, and an RCBus backplane board such as an SC147. Together, this system can run full GUI EmuTOS with 640x240 graphics in 16 colors.
Main components on the BITSY Mark I
BITSY Mark I bill of materials (BOM)
55 components, 32 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MC68HC000FN | PLCC-68_THT-Socket | U1 |
| 1 | MC68901 | PLCC-52_THT-Socket | U2 |
| 2 | SST39SF040 | PLCC-32_THT-Socket | U3, U4 |
| 1 | SRAM_SIMM | DRAM-72-2021 | U5 |
| 1 | MIC1232 | DIP-8_W7.62mm_Socket_LongPads | U7 |
| 4 | ATF22V10C | DIP-24_W7.62mm_Socket | U8, U9, U10, U11 |
| 1 | AY-3-8913 | DIP-24_W15.24mm_Socket_LongPads | U12 |
| 2 | 74HCT245 | DIP-20_W7.62mm_Socket | U14, U15 |
| 1 | 2N7000 | TO-92_HandSolder | Q1 |
| 1 | 16MHz | Oscillator_DIP-8 | X1 |
| 1 | 7.3728 MHz | Oscillator_DIP-8 | X2 |
| 1 | 2 MHz | Oscillator_DIP-8 | X3 |
| 1 | AudioJack3_SwitchTR | Jack_3.5mm_CUI_SJ1-3535NG_Horizontal | CON1 |
| 1 | Barrel_Jack_Switch | BarrelJack_Horizontal | J1 |
| 1 | Conn_01x06 | PinHeader_1x06_P2.54mm_Horizontal | J2 |
| 1 | Conn_01x05 | PinHeader_1x05_P2.54mm_Horizontal | J3 |
| 1 | Conn_01x40_Pin | PinHeader_1x40_P2.54mm_Vertical | J5 |
| 1 | Jumper_3_Bridged12 | PinHeader_1x03_P2.54mm_Vertical | JP1 |
| 1 | Jumper_2_Bridged | PinHeader_1x02_P2.54mm_Vertical | JP2 |
| 1 | RESET_SW | SW_PUSH_6mm | SW1 |
Show 12 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LED | LED_D5.0mm | D1 |
| 12 | 0.1uF | C_Rect_L7.0mm_W2.0mm_P5.00mm | C1, C2, C3, C4, C7, C8, C9, C10 +4 |
| 2 | 470uF | CP_Radial_D6.3mm_P2.50mm | C92, C93 |
| 1 | 100pF | C_Rect_L7.0mm_W2.0mm_P5.00mm | C94 |
| 2 | 100uF | CP_Radial_Tantal_D4.5mm_P2.50mm | C97, C98 |
| 1 | 470 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2 |
| 1 | 10K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3 |
| 2 | 1000 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R84, R85 |
| 2 | 1600 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R86, R87 |
| 3 | 3000 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R88, R89, R90 |
| 1 | 100 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R97 |
| 2 | R_Network06 | R_Array_SIP7 | RN1, RN2 |
BITSY Mark I design files
The KiCad project lives in the codesmythe/BITSY_MK_I repository on GitHub; these links point at the commit this page was built from.
- LayoutBITSY.kicad_pcb
- SchematicBITSY.kicad_sch
BITSY Mark I: common questions
How big is the BITSY Mark I PCB?
The BITSY Mark I measures 102 × 102 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the BITSY Mark I?
55 components, from 32 distinct parts. The full bill of materials is listed on this page.
Where can I download the BITSY Mark I design files?
From the codesmythe/BITSY_MK_I repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the BITSY Mark I design in my own project?
It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.
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