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eeprom programmer

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 Wanted to be able to program 28C64s and 28C256s because they looked easy and cheapish for up and coming boards, eg 1802, 6502. Was learning Vim at the time and was quite slow at getting code into Arduino IDE via Vim edit page. Also got preoccupied with tweaks and tips. Today, finally got Uno system to program clunky breadboards to read in 5 bytes and program them and verify via terminal. Here's the pic: (NB, numbers seem to be one off. Was expecting 65,66,67... but got 66,67,..Will sort it out. Here's the breadboard lashup: The schematic isn't all in one place, so that will be the next job. The main idea is to use the I2C bus of the Arduino to drive the two MCP23008s which have 8 I/O pins each. These, in turn, connect to the 28C64's I/O, and to the 4040 which generates 12 address lines and the control lines: CE*,OE* and WE*. The 28C64 was used because there were some already ordered from AliExpress and the MCP23008s were used because they were available at the local Ja...
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SD Card, Circuit Python via Thonny

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 Finally got Pi Pico to run simple SD card program with Thonny and Circuit Python using adafruit library. # SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries PB1 try # SPDX-License-Identifier: MIT #Worked !! Sat Jun 25 15:20:38 NZST 2022 import os import busio import digitalio import board import storage import adafruit_sdcard # The SD_CS pin is the chip select line. # #     The Adalogger Featherwing with ESP8266 Feather, the SD CS pin is on board.D15 #     The Adalogger Featherwing with Atmel M0 Feather, it's on board.D10 #     The Adafruit Feather M0 Adalogger use board.SD_CS #     For the breakout boards use any pin that is not taken by SPI #SD_CS = board.SD_CS  # setup for M0 Adalogger; change as needed #block below from DoneBot workshop pb Some capitalisation changes MOSI = board.GP11 MISO = board.GP12 #clk = board.GP10 SCK = board.GP10 cs = board.GP15 # Connect to the card and mount the filesystem. sp...
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