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Update HW verifier readme

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Tom Nisbet 2019-06-09 20:10:15 -04:00
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HardwareVerify/README.md
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## hardware Verifier Tool
This tools allows access to individual control lines from the Arduino to verify that the hardware was assembled correctly.
## Hardware Verifier Tool
This tool allows access to individual control lines from the Arduino to verify that the hardware was assembled correctly.
It can be used without a chip installed to scope out address and data lines. It also offers low-level control when the chip
is installed.
It can be used without a chip installed to scope out address and data lines. It also offers low-level control when the chip is installed.
Note that the comamnds allow for direct writing of the 28C control lines with some exceptions to protect the chip and the host arduino:
THIS TOOL USES DIRECT PORT ACCESS ON THE ARDUINO. CHECK TO MAKE SURE IT IS
COMPATIBLE WITH YOUR BOARD BEFORE USING. It will work correctly on the Unu, Nano, and Boarduino. It WILL NOT WORK on the Micro.
Note that the comamnds write access to the individual 28C control lines with some exceptions to protect the chip and the host arduino:
* When the O command is used to enable chip output, the arduino data bus is set to INPUT
* When the D command is used to write data from the arduino, the chip output is disabled