Re: ROM Dump of Amiga Keyboard controller

From: Greg King <>
Date: Fri, 04 Jul 2014 00:43:27 -0400
Message-id: <>
On 2014-07-03 12:40 AM, Jim Brain wrote:
> static inline __attribute__((always_inline)) void read_data(void) {
>    TEST_OFF();
> . . .
>    TEST_ON();
> }

Two more tests:

1) The RESET voltage needs to be dropped to 5V only on the cycles when 
the mask ROM is read.  So, comment out those two calls; and, see if it 
makes a difference (I hope that it doesn't; but, we need to be sure).

2) Try adding a half-cycle phase shift (relative to the internal clock):
After the RESET line is raised to 10V, delay for one external-clock 
cycle, then start sending the byte sequence.

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Received on 2014-07-04 05:00:35

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