Go to Triangle Digital Support Home Page TDS2020F TECHNICAL MANUAL
Introduction
PCB links
Live website search
Enter key words
 

PCB LINKS

Jumper links enable various options on the TDS2020F. The links E F G W (and W & X on TDS2020DV) are push-on jumpers since it is frequently necessary to change from RAM to EPROM if one is used for the program in the 28-pin socket. The others are solder links. To change a solder link use a scalpel to cut the thin copper track making a link or apply a solder blob if it is unmade. When desoldering links use a clean desoldering tool that will not spray particles of solder around. Use a very fine-tipped soldering iron. Connections on delivery are marked  * .

 

 

Default

Function

Links made

Links open

*

Normal +6V to +16V specification

 

A

 

Lower +5.4V input, no series diode

A

 

 

 

 

 

*

32k RAM or EEPROM in 28-pin socket

F W

E G

 

32k EPROM in 28-pin socket

E G

F W

 

 

 

 

*

128k or 512k RAM EEPROM, EPROM or

 

 

 

Flash in 32-pin socket

K

J

 

8k or 32k RAM or EEPROM in 32-pin socket

J

K

 

 

 

 

*

Slow reset enabled. Power voltage can rise slowly

H

 

 

Computer will work from +5V input on +5VOUT

 

H

 

 

 

 

*

Any RAM, or 32k EPROM/EEPROM in 32-pin socket

L M

N O

 

128k or 512k byte EEPROM, EPROM or Flash

 

 

 

in 32-pin socket

N O

L M

 

 

 

 

*

No external 32-pin RAM expansion

P

Q

 

External RAM expansion

 

 

 

(on-card RAM can be switched out)

Q

P

 

 

 

 

*

Not +12V Flash memory in 32-pin socket

R

 

 

Obsolescent +12V Flash memory in 32-pin socket,

 

 

 

A18 (pin z12) becomes VFLASH (+12V input)

 

R

 

 

 

 

*

A to D referenced internally

S T

 

 

External A to D reference on AVCC & AGND

 

S T

 

 

 

 

TDS2020DV piggyback board link

*

Middle socket acts as RAM (pin 27 to WR*)

W

X

 

Middle socket acts as ROM (pin 27 to +5V)

X

W

Go to Triangle Digital Support Home Page Go to top   Next page