Resources
thimet.de
throchilidae
arithmomuseum
Documents
Internals
Main Board
Keyboard
Display
Reassembly
Advertisements
Commodore SR-4148
The Collection
Search Collection
GOTO
Tags
1964
1972
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1997
1998
1999
2000
2007
ARM
ARM710
AY-3-8500
Calculator
Camera
Capricorn
CDROM
FDD
HDD
Hitachi
i286
i386
i486
i8048
i8080
i8086
i8088
i8255
Intel
Laptop
LCD
LED
LH5801
Luggable
MC6800
MC6803
MC6809
MC68000
MC68008
MC68020
MC68030
MC68040
Monitor
MOS
MOS65SC12
MOS6502
MOS6507
MOS6510
MOS7501
MOS8500
MOS8501
MOS8502
Motorola
MSX
PC
Pizza Box
Plotter
PowerPC
PPC603
Printer
Radio
SC43177
SC43178
SC61860
SH-3
STMP3600
Tape Recorder
Tips & Tricks
TMS9900
TV
VCR
Watch
XScale
Z80
Blog Stats
- 656,633 hits
Most Used Categories
1977 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1997 1998 Calculator FDD HDD i286 i386 i8088 Intel Laptop LCD LED Luggable MC68000 MC68030 MC68040 Monitor MOS MOS6502 Motorola PC Pizza Box PowerPC Printer Tape Recorder Tips & Tricks TV Watch Z80
Blog Stats
- 656,633 hits
Thanks so lot!
Bought one on ebay for $68, internal batteries don’t work but the adapter and the calculator does,I had forgotten how tiny those LED displays were,Its also intersting that non of the keys are double function, something that was standard even back then.
It would be interesting to know what voltages are on the converter wires Red, Black and Blue and if Black is common or if Red is common. I guess this is a voltage booster as later calculators used 9v batteries? and this and the SR-9190R used 3 x NiCd batteries.? My Sr-9190R is dead and i cannot see any voltage on the blue wire?
Hi Lee – Blue wire is -6v on my calculator. The first-generation chips required a negative rail, I believe.
The converter actually creates a negative voltage that was necessary for some of the original processor chips. On my calculator, Red = VCC Black = Ground and Blue =-6v.
Hopefully this isn’t a duplicate post! The ‘converter’ actually creates a negative voltage that is required for this generation of calculator chips. Red = VCC Black = Ground and Blue = -6V (on my calculator). Hope this helps.
J ai réparé une sr 4190 r avec 3 piles nicd ….et elle fonctionne nickel