2 layers100 × 100 mm
Adder
tensorway/2000transistors
The project is made in Kicad. If you want to learn more about it visit howcpuworks.com.
208 parts
2 layers100 × 100 mm
Memory board
tensorway/2000transistorsThe project is made in Kicad. If you want to learn more about it visit howcpuworks.com.
- Size
- 100 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 53
- Nets
- 60
- Pads
- 205
- Tracks, vias
- 441, 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 25 Oct 2023
- Updated
- 25 Oct 2023
Overview
Memory board is an open-source printed circuit board by tensorway, from the tensorway/2000transistors repository on GitHub. It is a 2-layer board of 100 × 100 mm with 53 parts on 60 nets, routed with 441 tracks and 2 vias.
Its parts include 13 resistors, 13 diodes, 13 transistors, 8 connectors and 3 ICs. It belongs with the AVR (ATmega, ATtiny) boards of this library.
README
README.md2000 MOSFET processor
The project is made in Kicad. If you want to learn more about it visit howcpuworks.com.
Conventions
- all transistors on a board point into the same direction (or 2 perpendicular ones if needed)
- all leds point into the same direction
- 1k resistors are labeled with white rectangle, 1M with empty one (only violation is in the Clock board and two voltage divider resistors in LCD board)
- "*" means high significance bits
- "+" means positive 5V
Tips
- you dont need to use extra usb for the power, powering through arduino is enough
- Adder is made out of 2 smaller 6 bit adders, this means that you do not have to solder one bit (6+6=12 != 11)
- instruction register needs only 5bits which means you do not have to solder upper 6 bits (all registers are the same board to lower costs)
- when soldering
- first put resistors
- than transistors from the top left (top right if left handed)
- leds and pin headers last
Important
- to lower costs all registers have the same board, but TMP and IR registers do not have input and output connected to the bus, this means you have to connect it on other registers
- You need to find the voltage that works for your LCD contrast and put those resistors
Components
- 2N7000 MOSFETs
- BC547 (BJT) only 4 for the astable
- 1000 ohm registers for leds
- 1M ohm for logic
Bugs
While I could fix the bugs I do not want to check is everything working again because I would need to solder things again. This is why I list them, so you can either fix them yourselves before or after soldering (I did after). Some bugs are just layout bugs, which means you need to be aware of them but not necessarily fix them.
Micromemory:
- shuffled by row led, select and switches - layout bug
- 0th line not connected to rest
Micromemory stepper:
- shuffeled LED state order - layout bug
- add delay from clock to it (for example RC)
Keyboard
- same signals for simetrical (with respect to keyboard diagonal) switches
- effectively half the number of switches
- 1 bit not connected
Flags
- second to last carry and last carry labels mixed - layout bug
- flags selector selects 0 always
Clock
- manual clock does not have a debouncer
ALU
- add OR between ALU decoded ops and give Adder the output
Parts
53| Qty | Value | Footprint | References |
|---|---|---|---|
| 13 | 2N7000 | processor2:2n7000_tight | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13 |
| 13 | LED | processor2:led_5mm_tight | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13 |
| 13 | R | processor2:resistor_led_tight | R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13 |
| 6 | Conn_01x02_Male | processor2:2pin_tight | J1, J2, J4, J5, J8, J9 |
| 3 | Conn_01x11_Male | processor2:11pin_tight | Address1, J3, J6 |
| 2 | arduino_nano | processor2:arduino_nano | U1, U2 |
| 1 | emergency_pins_1 | processor2:2pin_tight | J7 |
| 1 | emergency_pins_2 | processor2:2pin_tight | J10 |
| 1 | usb_c_power | processor2:usb_c_power | U3 |
Questions
How big is the Memory board PCB?
It measures 100 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Memory board use?
53 parts. 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 Memory board KiCad files?
From the tensorway/2000transistors repository on GitHub, at the commit this page was made from: the board is src/memory_board.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Memory board design in my own project?
Its repository states no licence, so its author keeps all rights: ask tensorway before reusing the design.
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The project is made in Kicad. If you want to learn more about it visit howcpuworks.com.
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The project is made in Kicad. If you want to learn more about it visit howcpuworks.com.
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The project is made in Kicad. If you want to learn more about it visit howcpuworks.com.
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The project is made in Kicad. If you want to learn more about it visit howcpuworks.com.
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