Star Tech Journal

STAR*TECH
Journal
October 1 995
6802
Fig. 1
NOP= 01 hex
Vss = Pin 1 (GND)
Vee = Pin 8 (5v DC)
Pin 20
Pin 8
Vee 5v DC
6802
0
Pin 1
Vss (GND)
hex
1
0000 : 0001
I
I
I
Vss (GND)
Pin 21
I
D7 D. Ds D4: Da D2 D, Do!
ToUsE
Remove the original
6802 or 6809 proces-
sor and install the di-
agnostic socket in
place of original.
Pin 40
To Pin 8 Vee 5v DC
resistor
Data Pins 26-33 lifted out of socket.
CONSI'RUCTION: STEP 1
Using a known good
stock 6802 (Fig. 1) or
6809E (Fig. 2) Micro-
processor LC. Place it
into a 40-pin socket
leaving the Data Pins
indicated in Fig. 1 & 2
out of the socket.
6809E
Pin 20
Using trace jumper
wire, solder the appro-
priate pins together
per figures 1 and 2.
NOTE
Pin 7
Vee 5v DC
6809E
CONSI'RUCTION: STEP 2
This LC. / Socket com-
bination can now be
put in place of the ex-
isting Microprocessor
- on our (SEGA) CPU
(6802) or Sound
(6809) Boards for diag-
nostic purposes.
Fig. 2
NOP= 12 hex
Vss = Pin 1 (GND)
Vee = Pin 7 (5v DC)
1
2
0001
0010
Pin 1
Vss (GND)
hex
I
Pin 21
Pin 40
:D7D.DsD4DaD2D1Do
resistor
Data Pins 24-31 lifted out of socket.
To Pin 7
Vee Sv