atari email archive

a collection of messages sent at Atari from 1983 to 1992.

GALs

(1 / 3)


I have changed the operation of the GAL on the DS III Board at location 1A/B.

This GAL is used in selecting the Graphics ROMs; these ROMs can be either
27C512s or 27C010s depending on whether there is a pin header in G0.

	Old was: No Header = 27C512, Header = 27C010

I have changed it to:

	No Header = 27C010, Header = 27C512

On DS III boards starting with Rev 2, the 68010 can read the state of
Pin Header G0. Self-Test starting with Version 2.4 uses this so it can 
correctly compute checksums.

I would like to have all DS III Boards to have the new GAL. It is a 16V8-25
and the file is [Margolin.GALs.Release]DS3_ROM.JED. The old part has a checksum
of 4177; the new part has a checksum of 4178.

At the same time, the games should get the latest Self-Test which is
[Margolin.Aces]STAL2_4.VLDA [Note that Self-Test is not yet finished.]

(When I release the GALs I will ask to have the files moved to 
[Logg.Ace.Release.ROMREVA].)

DS III Rev 1 boards can be modified to have this feature:

	1. On bottom of board, Cut the trace going to 6P pin 19;
	2. Connect a wire jumper from 6P pin 19 to 5J pin 1; 
	3. Connect a wire jumper from 6P pin 11 to pin header G0; 
	4. Connect a wire jumper from 6P pin 9 to 5D pin 6.
 

Jed

self test

(2 / 3)


	I am now using the new self test.  Please let me know when you fix
the CC1 and CC2 tests.  I wanted to make sure you are aware that the thumper
must be left on for approximately 16ms before it is turned off.

Steel Talons GALs

(3 / 3)


I couldn't release the GALs on Friday because I couldn't find Ed Logg
at the end of the day. I think they all went to the movie. Will try
again Monday.

Jed
Message 1 of 3

Jun 20, 1991