Programming a 2816A With a 2SIOJP

Discuss construction, troubleshooting, and operation of the Altair 8800c computer

Programming a 2816A With a 2SIOJP

Postby toml_12953 » February 18th, 2019, 6:05 am

In Martin Eberhard's 2SIOJP manual, it says that 2816A EPROMs can be programmed but it looks more complicated than just writing bytes to it.
It doesn't have to be erased first? Is there a program I can use to copy data to it? I'd like to create my own 2K ROM routines.

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Re: Programming a 2816A With a 2SIOJP

Postby AltairClone » February 18th, 2019, 7:03 pm

Read the data sheet of the particular 2816A you use to understand specifics of the write cycle.

In general for the 2816A, you simply write a byte to the desired location and the chip self times the write. You don’t have to erase before writes. You can implement a software delay loop to wait the appropriate amount of time between writes, or many have a polling mechanism to let software determine when the write has finished (e.g., D7 “not”).

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