IEC/RAM/ROM card – Retro Computing

The IEC-floppy/RAM card is a card connected to the Extension connector of the KIM-1 (any KIM-1, original and replica).

28K RAM, with jumpers. Most likely configuration is 24K from $2000.
And 4K can be added at $0400 -$13FF.
IEC interface, store and load files on a IEC device like a Commodore 1541 (or a SD card based IEC device!)
IEC ROM at $E000
All signals from the Extension connector are available on 2×22 pinheader

The IEC card has to be connected to the I/O card via a flat-cable to access the Kx address decoding signals.

Available downloads:

The IEC interface

Dave McMurtrie, known e.g from the facebook group Commodore International Historical Society, is a KIM-1 and Commodore collector. This year he surprised the KIM-1 users with an implementation of the IEC protocol for the KIM-1. With an IEC interface one can access many Commodore devices like the 1541 floppy disk drive. The interface is simple, a 7406 and some resistors and the typical DIN connector used by Commodore. Dave took the IEC routines from the C64 kernal and added a simple interface to save and load in the KIM-1 method: files have a one byte ID as filename and the same locations as the KIM-1 tape routines 17F5 -17F9 are used for start, end address and ID.
More on the 1541 IEC for KIM-1 can be found here..

How to use (from the German userguide)
Connect a Commodore 1541 floppy drive to the IEC card, Power on the 1541 and Reset the KIM-1, that should also reset the 1541.

The address of the Load/Save routines are:
SAVE: $E148
LOAD: $E000
$17F5 have the Startaddress low byte, $17F6 the Startaddress high.
$17F7 have the Endaddress low byte, $17F8 the Startaddress high.
$17F9 gets the File ID, use $01 – $FE

Do not load or save to/from addresses $0000-$1FF.

Example of storing memory from $0200-$02FF
Enter the following data
00F1 00 (CLD)
17F5 00 SAL
17F6 02 SAH
17F7 00 EAL
17F8 03 EAH
17F9 01 TAPE ID

Now start the save with a ‘Go’ at $E148. The floppy drive should now start and a file with name ’01’ saved.

Load a file into memory
To load the file stored in the example enter the following:
00F1 00 CLD
17F9 01 Tape ID
E000 GO start laod
The 1541 will start and the file “01” loaded into memory.

Press Reset or fill the vectors first:
17FA 00
17FB 1C
17FC 00
17FD 1C
17FE 00
17FF 1C

KB9 Basic
Netzherpes Nills posted a solution to use the IEC routines from Basic: