Commodore SX-64 - Page 3

31. Install (he JiffyDOS Selector Switch Into the hole just drilled in the case assembly and then secure it using the nut and washers
provided with the switch.
32. Replace the SX-64 top cover but do not reinstall the retaining screws at this time. Plug the AC power cord back into its connector at
the rear of the SX-64 and then into a working outlet.
Installation Checkout Procedure:
1. Switch the SX-64 ON. The red Indicator light on the front of the disk drive should come on Immediately as power is switched on.
stay on for about one second and then shut off as it normally does upon power-up.
IF THE RED DRIVE LIGHT DOES NOT COME ON, STAYS ON OR BLINKS, IMMEDIATELY SWITCH THE
SX-64 OFF. FOLLOW THE TROUBLESHOOTING STEPS OUTLINED BELOW:
A. Unplug the AC power cord from the rear or the SX-64 and remove the top cover. Recheck all cable connections to the various
circuit boards inside the SX-64. Make sure that none of the wiring that links the JiffyDOS Selector Switch to the Kernal and
1541 Adapter Boards has been broken. MAKE SURE THAT THE AC POWER CORD HAS BEEN PLUGGED INTO
A WORKING OUTLET. Correct any problems, replace the AC power cord, and try powering up the computer again.
B. If the problem still exists, unplug the AC power cord and remove the JiffyDOS Kernal ROM assembly from its socket on the
CPU circuit board. Check for bent pins (Straighten any pins, if necessary) and then reinstall it. MAKE SURE THAT THE
NOTCH IN THE KERNAL ROM IS ORIENTED CORRECTLY. Next, remove the JiffyDOS 1541 ROM assembly from
its socket on the 1541 circuit board. Check for bent pins, and then reinstall it. Once the Kernal and 1541 ROM assemblies
have been reinstalled, replace the AC power cord, and try powering up the SX-64 again.
C. If steps A and B both fail, remove the AC power cord and top cover, remove both the JiffyDOS Kernal and the 1541 ROM
assemblies, and reinstall the stock Kernal and 1541 DOS ROM's. Follow the same procedures for installing the stock ROM's
as used earlier. Make sure that the notches on both the stock ROM's are oriented correctly. Replace the top cover and AC
power cord, and try powering up the SX-64 again. If the SX-64 does not power up or operate properly with the stock ROM's
installed, seek the assistance of a qualified technician. If necessary, contact the distributor from whom you purchased the
JiffyDOS ROM or Creative Micro Designs, if the ROM was purchased directly from CMD and arrange for a warranty
replacement.
2. After the SX-64 has been powered on for a few seconds, the usual Commodore SX-64 BASIC or JiffyDOS sign-on message should
appear on the CRT screen.
IF THE DISPLAY DOES NOT APPEAR WITHIN THE APPROPRIATE AMOUNT OF TIME, SWITCH THE SX-64
OFF, AND PROCEED WITH THE TROUBLESHOOTING PROCEDURES FOUND ABOVE.
3. Once the SX-64 has been powered up successfully, test the operation of the JiffyDOS Selector Switch. To do this, first note which
sign-on screen is currently displayed on the CRT.
NOTE: When JiffyDOS is selected, the sign-on screen will display the words JIFFYDOS VX.XX at the top the screen. Otherwise,
the standard SX-BASIC screen will be displayed.
Next, switch the SX-64 OFF and then toggle the JiffyDOS Selector Switch to its alternate position. Turn the SX-64 back ON. The
alternate sign-on screen should then be displayed (for future use, take note of the switch position corresponding to the JiffyDOS
and Commodore sign-on screens).
If you cannot get both sign-on screens to be displayed, turn off the SX-64, toggle the selector switch back and forth several times
(to break through any oxidation on the switch contacts), turn the SX-64 back ON, and then repeat this step from the beginning. If
you still can get only one message to be displayed regardless of the switch position, switch the SX-64 OFF. and remove the AC
power cable and top cover. Check the Selector Switch wiring for shorted or broken connections at the Kernal ROM Adapter Board
and at the switch. Repair any evident problems (resolder the connections, if necessary), reassemble the SX-64, and check out the
switch again. If necessary contact the distributor from whom you purchased the JiffyDOS ROM or Creative Micro Designs, if the
ROM was purchased directly from CMD and arrange for a warranty replacement.
4. Next, shut off the SX-64. attach the keyboard and set the JiffyDOS Selector Switch for JiffyDOS mode. Power the SX-64 back ON.
Make sure that the SX-64 is in JiffyDOS mode (the sign on screen will display JIFFYDOS VX.XX when the SX-64 is in JiffyDOS
mode). Type the character @ on the keyboard followed by RETURN (this will read and display the disk drive error channel). The
following message should be displayed on the CRT screen:
73,JIFFYDOS X.X 1541,00,00
5. Insert a known good formatted diskette (preferably with a few programs on it) into the disk drive and press the f 1 key. The red disk
drive light should activate and a listing of the directory should appear on the screen.
If the directory listing does not appear, switch the SX-64 OFF. Remove the AC power cables and the top cover. MAKE SURE
THAT ALL INTERNAL CABLES ARE PLUGGED SECURELY AND CORRECTLY INTO THE PROPER
CONNECTORS. Correct any loose or Incorrect connections. Reassemble the SX-64 and try listing the directory again. If the
problem persists, seek the assistance of a qualified technician. If necessary, contact the distributor from whom you purchased
the JiffyDOS ROM or Creative Micro Designs, if the ROM was purchased directly from CMD and arrange for a warranty
replacement.
6. Once the directory listing appears correctly on the screen, shut the SX-64 OFF and remove the AC power cord from the rear of the
unit. Replace the retaining screws used to hold the top cover in place. Slide the rails into place along the side of the SX-64.
7. Replace the back panel and side rail retaining screws removed during disassembly (see Figure 1).
8. Plug the AC power cord back into the rear of the SX-64 and make sure that the keyboard is properly connected.
9. Refer to the JiffyDOS Users Manual for complete Instructions on how to use JiffyDOS.