Many posts have talked using GPIB to activate the options for Tektronix TDS500/600/700 scopes. But playing with GPIB is not very easy (the right card, driver, old computer, settings, and cost) for me.
Recently, during using the 'TDS500/600/700 NVRAM floppy backup and restore tool' to backup the NVRAM for my TDS540C, I found a way to activate the options by using this tool to write the revised backup to NVRAM through floppy. Quite easy! So, post it here, hope can help the TDS owners who is interest in this.
Note: The 'TDS500/600/700 NVRAM floppy backup and restore tool' is developed by flyte, posted at '
https://www.eevblog.com/forum/testgear/tektronix-tds500600700-nvram-floppy-dump-tool/'. Thanks flyte for developed this great tool!
How to activate the option by floppy:
When the NVRAM was dumped, use a hex editor to open it. Then refer to below table, to change the related bit from 00 to 01, save. Use floppy to write it back, restart the TDS, the option will be enabled.
NVRAM Addr Addr in Hex Editor Value Option on/off Option
0400081D 0000081D 00 Off TV Trigger
0400081F 0000081F 01 On Option 1M
04000821 00000821 00 Off N/A
04000823 00000823 01 On Option 13
04000825 00000825 01 On Option 1F
04000827 00000827 01 On Option 2F
04000829 00000829 00 Off N/A
0400082B 0000082B 01 On Option 2C
0400082D 0000082D 00 Off Option 3C
0400082F 0000082F 00 Off Option 4C
04000831 00000831 00 Off Option 2M
Please note, some option need hardware to be installed (TV trig, 13, 3C, 4C, 2M). Option will not appear if you not install them.
Much more easy than GPIB process, right? Have fun!