Installation of a real-time clock
You need the SMD IC RTC 4513 from Seiko-Epson (ca. 5,40 DM from
Reichelt Elektronik)
Additional very thin cables for internal installation. You can use either 15- or 11-pin-interface. Go to
PC-1360 hardware page
to get the 15-pin driver.
| 11 pin interface | RTC 4513 |
|---|---|
| 8 | 2 |
| 10 | 13 |
| 3 | 9 |
| 11 | 12 |
| 2 | 6 |
Infrared interface
This one of my best products: An infrared remote control module for Sharp PCs! You need this material
(from Conrad or Reichelt Elektronik):
ICs
1 TSOP 1738 or 1740 (ca. 2,50 DM)
1 NE 555
Transistors
1 BC 548
2 BC 338
Diodes
2 LED Infrarot for IR applications
1 LED red
1 Silicium diode 1N4148 (standard diode)
Condensators
2 330 µF/16V
1 4,7 nF
Resistors
3 1 kOhm
1 6,8 kOhm
1 7,5 kOhm
1 100 Ohm
1 2 Ohm
Other
1 socket 2,5mm mono with switch
1 mini switch
1 accu 6 volts (100mAh or more)
1 case
Some experienced users may solder the clock on the IR module, too, and use the lines on the 11-pin-interface as described
at connections. You can also add a voltage regulator for 6 volts to use the calculator during recharge!
Overclocking the PC-1475
On the lower circuit board there is a small blue or silver CERALOCK oscillator with 768 kHz. Change it to one with 1,25 MHz
and you have a faster computer!
This will make data transmissions and BEEP faster, too. To use PcTrans or
PocketASM you must enter 1953 
baud for serial transmissions! Cassette will only work with the same computer!
Make a RAM card
You need: IC PG51256SL or D43256B (SMD version) and IC 74HC00 (SMD version), a board and isolated wire!
Pin assignment:
Click for a large picture!
Diskette drive simulator for PC-1xxx (11 pin interface)
This is the original TransDrive diskette drive simulator for fast and easy file-access-like data exchange!
Elements used:
1 74HC74
1 74HC164
1 74HC174
1 74HC157
1 CD4050
1 7805
5 100 kOhm
1 10 kOhm
1 3,3 kOhm
1 220 kOhm
8 Silicium diodes
1 LED red
5 100 nF
3 10 µF
1 9 pin SUB-D plug
1 11 pin pocket plug
Use the commands LOAD "X:filename.ext" and SAVE "X:filename.ext" to load and store programs.
Additional you can load and save RAM portions like machine programs with LOAD M "X:file.ext",startaddress and SAVE M "X:file.ext",startadresse,endaddress!
Software for DOS: TransDrive program
Layout for board from Conrad-Electronic (# 527181-22) as picture
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