[Mar/15/97]

-----------------------------
Discs of Tron by Bally/Midway
-----------------------------


These ROM images came from the environmental 
version of Discs of Tron.


The archive information:

Location  Type       ID     Checksum
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
CPU 1C    27128   LOC-CPU1    AE20
CPU 2C    27128   LOC-CPU2    DCF5
CPU 3C    27128   LOC-CPU3    EB94
CPU 4C    27128   LOC-CPU4    8A4D
CPU 5F    2764    LOC-BG1     73AB
CPU 6F    2764    LOC-BG2     88ED

SIO A7    2532    LOC-A       E864
SIO A8    2532    LOC-B       3114
SIO A9    2532    LOC-C       BE90
SIO A10   2532    LOC-D       8A36

SNT U3    2532    PRE-U3      AD82    
SNT U4    2532    PRE-U4      32A8
SNT U5    2532    PRE-U5      D39E

SVG A1    2764    VGALOC-A    5F4D
SVG A2    2764    VGALOC-B    9974
SVG A3    2764    VGALOC-C    D9A5
SVG A4    2764    VGALOC-D    ABE8
SVG A5    2764    FGA-5       A8E6
SVG A6    2764    FGA-6       514B
SVG A7    2764    FGA-7       04DA
SVG A8    2764    FGA-8       4AB8


Note: CPU - MCR II Super CPU board              (A080-91490-G000)
      SVG - MCR III Super Video Gen             (A080-91464-H000)
      SNT - Squawk and Talk MCR II PCB          (A080-91660-C000 35-83)
      SIO - MCR II Sound I/O board with Panning (A080-91657-A000)



[05/12/96]

        DISC OF TRON   CHIP PLACEMENT

CHIP #  POSITION  TYPE
------------------------
SOUND0   A7       2532   SOUND BD
SOUND1   A8        "      "
SOUND2   A9        "      "
SOUND3   A10       "      "
LOC-A    CP0      2764   VIDEO BD
LOC-B    CP9       "      "
LOC-C    CP8       "      "
LOC-D    CP7       "      "
LOC-E    CP6       "      "
LOC-F    CP5       "      "
LOC-G    CP4       "      "
LOC-H    CP3       "      "
LOC-BG2  6F        "      "
LOC-BG1  5F        "      "
LOC-PG1  4C        "     CPU BD
LOC-PG2  3C       27128   "
LOC-PG1  2C        "      "
LOC-PG0  1C        "      " 
PRE      U5       2532   SQUAWK & TALK BOARD
PRE      U4        "
PRE      U3        "

-


[Jul/27/2000]

Discs of Tron upright - version 2

File		CRC		Comments
----------------------------------------
loc-a.cp0	018ca8dd	dated 8-15
loc-b.cp9	0e7aa6e2	dated 8-15
loc-c.cp8	12bc284a	dated 8-15
loc-d.cp7	498e9ff7	dated 8-15
loc-e.cp6	7886631d	dated 8-15
loc-f.cp5	83da31a7	dated 8-15
loc-g.cp4	635c741d	dated 8-15
loc-h.cp3	18fbdc33	dated 8-15
loc-bg1.5f	bb2d7a5d	same as enviro
loc-bg2.6f	40167124	same as enviro
loc-pg0.1c	40d00195	dated 10/4/83
loc-pg1.2c	5a7d1300	dated 10/4/83
loc-pg2.3c	cb89c9be	dated 10/4/83
loc-pg1.4c	5098faf4	dated 10/4/83
sound0.a7	7fb54293	dated 10/4/83
sound1.a8	edef7326	dated 10/4/83
sound2.a9	e8ef6519	same as ur v1; dated 9/22/83
sound3.a10	6b5aeb02	same as ur v1; dated 9/22/83
pre.u3		c3d0f762	copied from upright version 1	
pre.u4		7ca79b43	copied from upright version 1
pre.u5		24e9618e	copied from upright version 1

The pre files were copied in here so that this would run under MAME.
I did not pull these off the speech board, as I didn't have one with
the boardset.

Bugs
----
One of the ROMs appears to be corrupt.  Sark has a few different standing 
positions sprites. A few of them are corrupt, or the program is pointing 
to the wrong ones, because at least two of the positions are replaced 
with nothing, and a red disk, so it appears as if Sark disappears from 
time to time.  I'm sure a clever person with a MAME debugger could figure 
out the problem and straighten the sprite issue out.  Otherwise, the game 
appears to play fine.  I am attempting to find someone with a version of
these EPROMs and see if I can get a non-corrupted version.  


How to quickly tell which version you have
------------------------------------------
During the points/scoring screen, if the bottom item is
"Derezz a ring    2000", then you have this version.

Differences between version 1 and version 2
-------------------------------------------
Most obvious differences are in the test menus.

Sounds menu: there is no test for 5) Tilt, 7) Ring up, 8) Tron up.  These 
sounds are still present in the game, however.

Inputs menu: this version simply says "Activate all devices.  Tilt to exit"
whereas the other versions says it a little better: "Activate all player
input switches and devices.  Hit tilt to exit"

In MAME, the boot up appears differently.

During the demo, when point values are displayed, there is an additional
"Derezz a ring 2000" that is displayed.

Speculation
-----------
The additional "clean" text and additional tests leads me to believe this
is an earlier version of the ROMs.  However, the additional the of the 
"Derezz a ring", and the fact that the other sound rom dates differ from
the sound rom dates that match the other version, might contradict this.
I would need to see the actual dates on the other versions ROMs to make
this decision.

-



[Jul/27/2000]

Discs of Tron upright - version 2
Read in by Mark Jenison 7/26/00

File		CRC		Comments
----------------------------------------
loc-a.cp0	018ca8dd	dated 8-15
loc-b.cp9	0e7aa6e2	dated 8-15
loc-c.cp8	12bc284a	dated 8-15
loc-d.cp7	498e9ff7	dated 8-15
loc-e.cp6	7886631d	dated 8-15
loc-f.cp5	83da31a7	dated 8-15
loc-g.cp4	635c741d	dated 8-15
loc-h.cp3	18fbdc33	dated 8-15
loc-bg1.5f	bb2d7a5d	same as enviro
loc-bg2.6f	40167124	same as enviro
loc-pg0.1c	40d00195	dated 10/4/83
loc-pg1.2c	5a7d1300	dated 10/4/83
loc-pg2.3c	cb89c9be	dated 10/4/83
loc-pg1.4c	5098faf4	dated 10/4/83
sound0.a7	7fb54293	dated 10/4/83
sound1.a8	edef7326	dated 10/4/83
sound2.a9	e8ef6519	same as ur v1; dated 9/22/83
sound3.a10	6b5aeb02	same as ur v1; dated 9/22/83
pre.u3		c3d0f762	copied from upright version 1	
pre.u4		7ca79b43	copied from upright version 1
pre.u5		24e9618e	copied from upright version 1

The pre files were copied in here so that this would run under MAME.
I did not pull these off the speech board, as I didn't have one with
the boardset.

Bugs
----
One of the ROMs appears to be corrupt.  Sark has a few different standing 
positions sprites. A few of them are corrupt, or the program is pointing 
to the wrong ones, because at least two of the positions are replaced 
with nothing, and a red disk, so it appears as if Sark disappears from 
time to time.  I'm sure a clever person with a MAME debugger could figure 
out the problem and straighten the sprite issue out.  Otherwise, the game 
appears to play fine.  I am attempting to find someone with a version of
these EPROMs and see if I can get a non-corrupted version.  

How to quickly tell which version you have
------------------------------------------
During the points/scoring screen, if the bottom item is
"Derezz a ring    2000", then you have this version.

Differences between version 1 and version 2
-------------------------------------------
Most obvious differences are in the test menus.

Sounds menu: there is no test for 5) Tilt, 7) Ring up, 8) Tron up.  These 
sounds are still present in the game, however.

Inputs menu: this version simply says "Activate all devices.  Tilt to exit"
whereas the other versions says it a little better: "Activate all player
input switches and devices.  Hit tilt to exit"

In MAME, the boot up appears differently.

During the demo, when point values are displayed, there is an additional
"Derezz a ring 2000" that is displayed.

Speculation
-----------
The additional "clean" text and additional tests leads me to believe this
is an earlier version of the ROMs.  However, the additional the of the 
"Derezz a ring", and the fact that the other sound rom dates differ from
the sound rom dates that match the other version, might contradict this.
I would need to see the actual dates on the other versions ROMs to make
this decision.

-

