Posts in 2021
  • ATAPI Audio-CD player

    Monday, July 26, 2021 in Hacks

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    What is it? ATAPIMega is a hardware project which allows regular (P)ATA CD/DVD drives to be used as a standalone Audio-CD player. The PCB accepts (regulated!) 12V DC power via a 5.5mm/2.1mm barrel jack and outputs 12V/5V for the CD drive. The …

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  • TCP/IP for Casio calculators

    Monday, July 12, 2021 in Hacks

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    What is it? fxIP is a port of uIP 1.0 to Casio fx-9750/fx-9860 calculators. It requires calculators with a SuperH SH4a CPU, needs quite a bit of SRAM. fxIP connects to IP networks via SLIP encapsulation over the 3-pin 2.5mm 5V serial port/UART. …

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Posts in 2020
  • eMMC (micro)SD card

    Monday, December 21, 2020 in Computing

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    What is it? These PCBs contain eMMC storage ICs, which are electrically compatible with SD and microSD interfaces. They use a different protocol and (depending on the type of eMMC IC used) can be more reliable and faster. Many (but not all!) SD card …

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  • ISA8019 NIC

    Thursday, November 12, 2020 in Retrocomputing

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    What is it? ISA NE2000-compatible network card Using RTL8019 chipset, 10Base-T full duplex ethernet Can be configured via jumpers, EEPROM or full ISA PnP. Compatible with 8-bit XT machines. Optimized for automated assembly at JLC. Plug & Play …

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  • Programmable logic in PHP

    Sunday, November 08, 2020 in Hacks

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    What is it? Parallel ROMs (OTP-ROMs, EPROMs, EEPROMs, NOR flash, etc.) can be used as simple, programmable logic devices. They can be programmed to hold a lookup-table / bit stream, which will emulate logic functions (like 74-series logic) by …

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  • ISA-over-USB

    Wednesday, October 14, 2020 in Retrocomputing

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    What is it? This project allows the use of ISA extension cards on a modern computer over a USB interface. The main project goal was to learn about the ISA bus, not to build a polished product. USB limitations USB has inherent limits to the minimum …

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  • Graphical 128x64px VFD

    Sunday, September 27, 2020 in Art

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    What is it? This adapter board provides the required voltage level conversion, anode supply and filament bias voltages to run a Noritake MN12864K graphical vacuum fluorescent display. Bad Apple Links Breadboard adapter: KiCAD design files …

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  • FlexibleLOM PCIe adapter

    Sunday, September 27, 2020 in Computing

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    What is it? This passive adapter PCB allows the use of HP FlexibleLOM extension cards (like 10/40 GbE network cards) in regular PCIe slots. FlexibleLOM extension cards are available used at very low prices (due to them not being PCIe compatible, …

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  • GPIO PATA/IDE on Linux

    Saturday, August 08, 2020 in Hacks

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    What is it? pata-gpio is a Linux kernel driver for GPIO bitbanged PATA (also known as ATA/ATAPI or IDE). Pin configuration can be set via device tree, the regular ATA framework is used. IDE Primary/Secondary device support is implemented. In use …

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  • CMM2 PCB

    Wednesday, July 29, 2020 in Retrocomputing

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    What is it? The Colour Maximite 2 is a hobbyist computer, mimicking the home computers of the 80s, running BASIC. Because the original PCB (and seperate STM32 devboard) were expensive and hard to obtain, we designed this machine-assembly ready PCB. …

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