4 layers68.6 × 53.3 mm
Icezum
FPGAwars/icezum
:star2: IceZUM Alhambra: an Arduino-like Open FPGA electronic board
218 parts357GPL-3.0
2 layers81.3 × 30.9 mm
ISABlaster
scrapcomputing/ISABlaster53A software-defined ISA card powered by a Raspberry Pi Pico
- Size
- 81.3 × 30.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 24
- Nets
- 68
- Pads
- 219
- Tracks, vias
- 1,047, 52
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 14 May 2023
- Updated
- 19 May 2023
Overview
ISABlaster is an open-source printed circuit board by scrapcomputing, from the scrapcomputing/ISABlaster repository on GitHub, published under the GPL-2.0 licence. It is a 2-layer board of 81.3 × 30.9 mm with 24 parts on 68 nets, routed with 1,047 tracks and 52 vias.
It is built around the TXS0108EPW. Its parts include 7 capacitors, 6 resistors, 5 connectors, 4 ICs and 1 transistor. It belongs with the RP2040 boards of this library.
Main components
1README
README.mdISA Blaster
A PCB for a software-defined ISA card powered by a Raspberry Pi Pico micro-controller. All the logic for interfacing to the ISA bus is done in software.
Projects based on the ISA Blaster
DirtyRat USB Mouse Adapter
We can use the ISA Blaster as a USB mouse adapter card. This allows you to use a USB mouse on your vintage DOS PC without the need for an external adapter. This requires the use of:
- The DirtyRat mouse driver for DOS: https://github.com/scrapcomputing/DirtyRatDriver, and
- The DirtyRat Firmware for the Pico: https://github.com/scrapcomputing/DirtyRatFirmware.
How to load the firmware
- Unplug the ISA Blaster from the motherboard
- Remove any connected USB devices (e.g., mouse)
- Press and hold the small button on the Pico
- While holding the button, connect the Pico to your PC with a micro-USB cable
- The Pico should show up as a mass-storage device
- Copy the firmware to the drive associated with the Pico
- Safely eject the mass-storage device
Bill of materials
Gerber files are published in the releases: https://github.com/scrapcomputing/ISABlaster/releases
| Item | # | Description |
|---|---|---|
| Raspberry Pi Pico | 1 | |
| 1x20-pin 2.54mm Female Headers | 2 | For plugging in the Pico |
| 1x20-pin 2.54mm Male Headers | 2 | For the Pico |
| TXS0108EPW 20TSSOP | 3 | Bidirectional level-shifters 3.3V/5V |
| 2x6 2.54mm Male Pin Headers | 1 | For the IRQ selection |
| 2.54mm Jumper | 1 | For the IRQ selection |
| 0.1uF 1206 SMD capacitors | 6 | Decoupling capacitors for the ICs C1-6 |
| 2.2K through-hole resistor 1/8W | 2 | * Better to leave them unpopulated: See "Known Issues" below |
| 3.3K through-hole resistor 1/8W | 2 | * Better to leave them unpopulated: See "Known Issues" below |
| 1uF through-hole ceramic capacitor | 1 | Smoothing capacitor for the board. |
| Horizontal Female USB connector | 1 | For plugging in a USB device. |
| 3-4cm short jumper wires | 2 | For connecting Pico's TP2,TP3 pads to the PCB's pads for the on-bard USB connector |
Known Issues
- Rev0.1 connects MEMR and MEMW to voltage dividers which are made up by the 2.2K and 3.3K through-hole resistors. The voltage dividers can cause issues on some motherboards, so it is better to leave them unpopulated. This will be fixed in a later revision of the board.
Parts
24| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 0.1u | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1, C2, C3, C4, C5, C6 |
| 3 | 2.2K | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R3, R5 |
| 3 | 3.3K | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R2, R4, R6 |
| 3 | TXS0108EPW | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U3, U4, U5 |
| 1 | |||
| 1 | 10uF | Capacitor_THT:C_Rect_L7.0mm_W3.5mm_P5.00mm | C7 |
| 1 | 2N3904 | Package_TO_SOT_THT:TO-92_Inline | Q1 |
| 1 | Bus_ISA_8bit | isa_blaster:8bit_BUS_AT | J1 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Horizontal | J5 |
| 1 | Conn_02x02_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J4 |
| 1 | Conn_02x06_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x06_P2.54mm_Vertical | J2 |
| 1 | RaspberryPi_Pico | isa_blaster:raspberry_pi_pico | U6 |
| 1 | USB_A | Connector_USB:USB_A_Molex_67643_Horizontal | J3 |
Questions
How big is the ISABlaster PCB?
It measures 81.3 × 30.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ISABlaster use?
24 parts, built around the TXS0108EPW. 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 ISABlaster KiCad files?
From the scrapcomputing/ISABlaster repository on GitHub, at the commit this page was made from: the board is kicad/isa_blaster.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the ISABlaster design in my own project?
Its repository publishes it under the GPL-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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