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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 * .
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Default
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Function
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Links made
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Links open
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*
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Normal +6V to +16V
specification
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A
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Lower +5.4V input, no series diode
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A
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*
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32k RAM or EEPROM in 28-pin
socket
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F W
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E G
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32k EPROM in 28-pin socket
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E G
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F W
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*
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128k or 512k RAM EEPROM,
EPROM or
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Flash in 32-pin socket
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K
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J
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8k or 32k RAM or EEPROM in 32-pin socket
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J
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K
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*
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Slow reset enabled. Power
voltage can rise slowly
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H
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Computer will work from +5V input on +5VOUT
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H
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*
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Any RAM, or 32k
EPROM/EEPROM in 32-pin socket
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L M
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N O
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128k or 512k byte EEPROM,
EPROM or Flash
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in 32-pin socket
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N O
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L M
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*
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No external 32-pin
RAM expansion
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P
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Q
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External RAM expansion
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(on-card RAM can be switched out)
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Q
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P
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*
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Not +12V Flash memory in
32-pin socket
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R
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Obsolescent +12V Flash
memory in 32-pin socket,
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A18 (pin z12) becomes VFLASH (+12V input)
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R
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*
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A to D referenced
internally
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S T
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External A to D reference on AVCC & AGND
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S T
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TDS2020DV piggyback
board link
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*
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Middle socket acts as RAM
(pin 27 to WR*)
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W
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X
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Middle socket acts as ROM (pin 27 to +5V)
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X
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W
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