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SAVE1500

Transfer .P files from PC to a TS1500 or ZX81 through the parallel port.
© 1999 Luis C. Grosso

System requeriments: a PC AT compatible computer from 386SX-33 thru 486DX4-100 (was not tested on faster and slower computers) with parallel port at 03BCH, 0378H or 0278H.

The program uses machine independent time delays taking advantage of the i8253 programmable interval timer.

Cable construction

Materials :                             QTY :

DB25 male connector                     1
3.5 mm mini plug (suitable for zx81)    1
shielded cable                          1.5m
resistor 470 ohm                        1

Connect pin 24 (GND) to the cable shield, and the other
end to the ring terminal of mini plug.
Connect a 470 ohm resistor to DB25 pin 2 (D0) in series
with the live wire, and the other end to the tip terminal
of mini plug.

                               470 ohm   __________
                            +-/\/\/\________________ tip
    DB25 male rear view    2|            __________
    ____________________________         |       ring
13  \ . . . . . . . . . . . . . / 1      |
 25  \ . . . . . . . . . . . . / 14      |
       -----------------------           |
         |24                             |
         +-------------------------------+

A 470 ohm resistor is used to protect the parallel port
TTL output against accidental short circuits especially
when inserting and removing the plug from the zx81 socket.


Tell other people:

Files for download

save1501.zip 5.1kB (1999-02-07 18:44)
Executable file, English commented source file and short desription.

Links to other pages



See also

ZX1541 : ZX81
Commodore 1541 disk interface for ZX81.

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Commodore
XA1451
ZX81
SAVE1500
ZX Spectrum
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© 2009-12-28 21:50 Jarek Adamski, http://8bit.yarek.pl