| Next revision | Previous revision |
| rnd:projects:adexp [2023-12-15 06:22] – created asdf | rnd:projects:adexp [2024-02-11 23:13] (current) – asdf |
|---|
| |
| ^ Part ^ Quantity needed ^ ^ | ^ Part ^ Quantity needed ^ ^ |
| | 22 pF, 2.54 mm | 2 | | | | 22 pF, 2.54 mm | 2 | [[https://www.digikey.com/en/products/detail/kemet/C315C220K2G5TA7301/6562341|DigiKey]] | |
| | 22 nF, 2.54 mm | 1 | | | | 22 nF, 2.54 mm | 1 | [[https://www.digikey.com/en/products/detail/kemet/C315C223J5R5TA/3728600|DigiKey]] | |
| | 100 nF, 2.54 mm | 6 | | | | 100 nF, 2.54 mm | 6 | [[https://www.digikey.com/en/products/detail/kemet/C320C104J5R5TA7301/3726081|DigiKey]] | |
| | 150 R, 1/4 W | 1 | | | | 150 R, 1/4 W | 1 | [[https://www.digikey.com/en/products/detail/koa-speer-electronics-inc/CF1-4CT52R151J/13537325|DigiKey]] | |
| | 1 k, 1/4 W | 1 | | | | 1 k, 1/4 W | 1 | [[https://www.digikey.com/en/products/detail/koa-speer-electronics-inc/CF1-4CT52R102J/13537832|DigiKey]] | |
| | 2.2 k, 1/4 W | 1 | | | | 2.2 k, 1/4 W | 1 | [[https://www.digikey.com/en/products/detail/koa-speer-electronics-inc/CF1-4CT52R222J/13537295|DigiKey]] | |
| | 10 k, 1/4 W | 3 | | | | 10 k, 1/4 W | 3 | [[https://www.digikey.com/en/products/detail/koa-speer-electronics-inc/CF1-4C103J/13537576|DigiKey]] | |
| | 47 k, 1/4 W | 1 | | | | 47 k, 1/4 W | 1 | [[https://www.digikey.com/en/products/detail/koa-speer-electronics-inc/CF1-4CT52R473J/13537610|DigiKey]] | |
| | 100 k, 1/4 W | 1 | | | | 100 k, 1/4 W | 1 | [[https://www.digikey.com/en/products/detail/koa-speer-electronics-inc/CF1-4CT52R104J/13537243|DigiKey]] | |
| | 1 M, 1/4 W | 1 | | | | 1 M, 1/4 W | 1 | [[https://www.digikey.com/en/products/detail/koa-speer-electronics-inc/CF1-4CT52R105J/13537547|DigiKey]] | |
| | green LED, 2.54 mm | 1 | | | | green LED, 2.54 mm | 1 | [[https://www.digikey.com/en/products/detail/w%C3%BCrth-elektronik/151031VS06000/4489988|DigiKey]] | |
| | ATMega328P-PU, DIP-28 | 1 | | | | ATMega328P-PU, DIP-28 | 1 | [[https://www.digikey.com/en/products/detail/microchip-technology/ATMEGA328P-PU/1914589|DigiKey]] | |
| | 74HC126, DIP-14 | 1 | | | | 74HC126, DIP-14 | 1 | [[https://www.digikey.com/en/products/detail/texas-instruments/SN74HC126N/376889|DigiKey]] | |
| | CD4068BE, DIP-14 | 1 | | | | CD4068BE, DIP-14 | 1 | [[https://www.digikey.com/en/products/detail/texas-instruments/CD4068BE/525931|DigiKey]] | |
| | 74HC00, DIP-14 | 1 | | | | 74HC00, DIP-14 | 1 | [[https://www.digikey.com/en/products/detail/texas-instruments/SN74HC00N/277209|DigiKey]] | |
| | 74HC04, DIP-14 | 1 | | | | 74HC04, DIP-14 | 1 | [[https://www.digikey.com/en/products/detail/toshiba-semiconductor-and-storage/TC74HC04APF/870457|DigiKey]] | |
| | LM358N, DIP-8 | 1 | | | | LM358, DIP-8 | 1 | already in stock | |
| | 8 MHz crystal, HC-49S | 1 | | | | 8 MHz crystal, HC-49S ((might need to substitute HC-49/US)) | 1 | | |
| | 3.5 mm audio jack | 2 | [[https://www.aliexpress.us/item/2251832698811093.html?gatewayAdapt=glo2usa4itemAdapt|AliExpress]] | | | 3.5 mm audio jack | 2 | [[https://www.aliexpress.us/item/2251832698811093.html?gatewayAdapt=glo2usa4itemAdapt|AliExpress]] | |
| | 1x3 pin header | 7 | | | | 1x3 pin header | 7 | [[https://www.digikey.com/en/products/detail/w%C3%BCrth-elektronik/61300311121/4846825|DigiKey]] | |
| | DIP-8 socket | 1 | | | | DIP-8 socket | 1 | [[https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/1-2199298-2/5022039|DigiKey]] | |
| | DIP-14 socket | 4 | | | | DIP-14 socket | 4 | [[https://www.digikey.com/en/products/detail/adam-tech/ICS-314-T/9832866|DigiKey]] | |
| | DIP-28 socket | 1 | | | | DIP-28 socket | 1 | [[https://www.digikey.com/en/products/detail/adam-tech/ICS-328-T/9832859|DigiKey]] | |
| | SBH11-PBPC-D13-RA-BK | 1 | [[https://www.digikey.com/en/products/detail/sullins-connector-solutions/SBH11-PBPC-D13-RA-BK/1990074?s=N4IgTCBcDaIMoCEASBGFBaACgzBhdAIigMzoBKAguggNIgC6AvkA|DigiKey]] | | | SBH11-PBPC-D13-RA-BK | 1 | [[https://www.digikey.com/en/products/detail/sullins-connector-solutions/SBH11-PBPC-D13-RA-BK/1990074?s=N4IgTCBcDaIMoCEASBGFBaACgzBhdAIigMzoBKAguggNIgC6AvkA|DigiKey]] | |
| | |
| | ==== Assembly ==== |
| | As all parts are through-hole, assembly proceeded simply enough. The most complicated portion was programming the ATMega chip, something we had never done outside of Arduino programming. We used the [[:Raspberry Pi]] GPIO [[:avrdude]] configuration and a breadboard. The fun came when programming the fuses((See https://www.engbedded.com/fusecalc/ for an AVR fuse calculator.)). We set them incorrectly on the first attempt and were subsequently unable to interact with the chip in any way; the same happened when we tried again with another chip and the correct fuse values. This was because both settings --- correct and incorrect --- told the chip to expect an external oscillator as its clock source. Once we built the required oscillator network, communications functioned normally. If we are to program more AVR chips in the future, it would be a good idea to construct a target board, perhaps with sockets for support components (crystals, capacitors, etc.). |
| |
| ===== SPI/I2C card ===== | ===== SPI/I2C card ===== |
| They probably didn't have [[https://github.com/dhansel/Altair8800-IOBus/tree/main/09-spi-i2c|these]] back in the day. | They almost certainly didn't have [[https://github.com/dhansel/Altair8800-IOBus/tree/main/09-spi-i2c|these]] back in the day. |