TRS-80 Model 4 I/O ports?

From: Phil Clayton <handyman_at_sprintmail.com>
Date: Tue Oct 20 08:03:15 1998

Tony Duell wrote:

> Does anyone have a list (or a URL) of the I/O ports on the TRS-80 Model
> 4, both their addresses and what the bits in each port do?
>
> I am particularly looking for info on the ports that control the CPU
> speed, memory mapping and the video system.

Hi Tony,
    Try this web site out, http://www.trade80.com/trs80/ it supports
many of the TRS-80 line of computers.. Should find what you want there, if
not I have a service manual for the TRS-80 Model III computer and perhaps
they use the same bus.. Hope this helps.. Phil...
Received on Tue Oct 20 1998 - 08:03:15 BST

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