Star Tech Journal

11
STAR*TECH JOURNAL/NOVEMBER 1982
is probably the most efficient andsqfest. With one hand in your pocket, use your
other hand to call up Nintendo and receive a return authorization number. After
receiving a return number, send the supply to Nintendo and let them work on it.
Fortunately, these power supplies are very reliable and usually no problems are
ever encountered with them, but when they are ... !
VOLTAGE
+ Svdc
Svdc
+ 12vdc
+24vdc
DESTINATION AND FUNCTION
Video and CPU Boards (VCC)
Supply voltage/all ICs
Video Board (VEE)
HD10124,HD10125,MB7074RAM,HD10116,HD10105,
MB10136. (Power inputs pin 8 on all ICs except MB7074
RAM (pin 12).
CPU Board
DAC 08 (pin 3)
MB3614 (pin 11)
CPU Board
Not used ( optional on-board audio amp not installed in
"Donkey Kong Junior").
CPU Board
Outputs to coin counter.
volts is primarily used to power a group of ECL ICs on the video
The -5
board.
HD 10105 -
HD 10116 -
HD 10124 -
HD10125 -
HD 10136 -
MB 7074 -
Triple 2-3-2 input Or/Nor gates.
Triple line receiver.
Quadruple TTL to ECL translator.
Quadruple ECL to TTL translator.
Universal hexidecimal counter.
ECL RAM (with heat sink).
ECL stands for emitter coupled logic. This type of logic works on current
instead of voltage; a "l" is so many microamperes and a "0" is so many less
microamperes. This is the fastest memory circuitry available and usually
requires triple layer PC boards (not in this case). These ICs are "power hogs"
and require hefty power supplies (-5 volt supply in "Donkey Kong Junior" can
deliver up to 5 amps).
PIN CONFIBUIIATION
I/OR
I/OW
MEMFi
MEMW
MARK
READY
HLDA
ADDSTB
AEN
HAQ
cs
CLK
RESET
DACK2
DACl<.3
DRO3
DRO2
DRO1
DROo
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
CPU Board (DJRJ-01) - The CPU board, as the name implies, is the
home of the central processing unit. This processor circuit consists primarily of
a Z80A microprocessor, which can access 24K bytes of program memory. There
is also an 8275-5 DMA controller for rapid access to the large memory. In
addition to the game microprocessor, there is also a separate sound micropro-
cessor (MBL 8035) which controls the sound circuitry. This processor, in
conjunction with a 4K program ROM, is responsible for all sound generation
except for the climbing, jump and thump sounds. These individual sounds are
controlled by circuitry external to the sound processor. All sounds are summed
together at the base of Q 1 and sent out to the audio amplifier in the monitor. The
CPU board also contains all input circuitry ( switch inputs) and output circuitry
(coin counter, sync and color information).
HARDWARE
Game microprocessor (7C) - Z80A
Program PROMs (SB, C, D) - 2764
Sound microprocessor(7H)-MBL 8035
Sound program PROM (3H) - 2732
DMA controller (7E) - 8257-5
Output color PROMs (2E, 2F) - 24S10
DMA Controller(8257-5)-The above hardware listing identifies aDMA
controller in position 7E. This IC (8257-5) is designed to simplify high speed
transfers between peripheral devices and memories. Essentially, it allows the
processor ( Z80A) to carry out other tasks while the DMA controller generates a
sequential memory address. In "Donkey Kong Jr.", these transfers appear to be
from one memory area ( display ROM) to another memory area ( display RAM).
This IC is one way that Nintendo manages to display numerous screens, each
one with very detailed images,
29
28
14
27
15
16
17
18
19
26
25
24
23
22
21
20
A7
A6
A5
A4
TC
A3
A2
A1
Ao
Vee
Do
D1
D2
D3
~
DACKo
DACK1
D5
D6
D7
PIN NAIES
D7-Do
A7-AQ
I/OR
I/OW
MEMR
Oita Bus
MEMW
Memory Write
CLK
RESET
READY
HAO
HLDA
AEN
ADSTB
TC
Clock Input
Address Bus
1/0 Road
1/0Writt
Memory Flt.S
Reset Input
Ready
Hold Roquost ho 8080AI
Hold Acknowtadgt I from 8080AI
Addrtu Enable
A.ddrns Strobt
DRO,-DR0o
DACK:tDA~KQ
T 1rmin1I Count
Modulo 128Mork
DMA Roquost Input
OMA Acknowtadgt Out
cs
Chip Select
Vee
+5Volts
GND
Ground
MARK
BOARD SET
Unlike "Donkey Kong", which used 2 and 4 board logic sets, "Donkey Kong
Junior" uses only 2 board sets. There are slight variations in design, but
essentially the boards are the same (a "Donkey Kong Junior" board set and
"Donkey Kong" board set are interchangeable in the games). The boards are
mounted back to back on a metal bracket and interconnected by two SO-pin
ribbon cables. The set consists of a CPU board on the top end and a video board
on the bottom.
µPD
8257/
8257-5
40
39
38
37
36
35
34
33
32
31
30
Even though this board closely resembles a "Donkey Kong" CPU, it is not
quite the same. This board has been redesigned to accommodate 28-pin, 64K
(2764) program PRO Ms. The program PRO Ms used on "Donkey Kong" were
24-pin, 32K (2532) PROMs. Obviously, interchanging 24-pin PROMs and
28-pin PROMs is impossible and prevents PROM only conversions from
"Donkey Kong" to "Donkey Kong Junior''. In addition, there were 2 2716
sound PROMs on "Donkey Kong". On "Donkey Kong Junior", however,
there is only a single 27 32 PROM. Even the two color PRO Ms (2E, 2F) are
different in each game.
TEST POINTS
TPl - Ground
TP2 - Reset
TP3-V. BLK
TP4- V. Sync4'
TPS - H. Sync4'
•No post mounted on board.
Video Board (DJRl-01 or modified TKG4-14) - The bottom board
contains all circuitry having to do with video generation, including the master
oscillator and sync circuits. There are separate circuits dedicated to the display
of the background objects as well as all the moving objects. The principle
elements include the image PROMs, color RAMs, object RAMs, and horizontal
data RAM.
HARDWARE
Image PROMs (moving images) (7C, D, E, F) - 2716
Background PROMs (3P, 3N) - 2732
Object RAMs (6P, 6R) - 2148
Horizontal Pos. RAM (7M) - 93419
Background Color RAM (2P, 2R) - 2114
Color PROM (2N) - 24S10
Moving Color RAMs (attack) (2E, 2H) - MB7074