Absolutely! "Something I would have made in the 80s" is as old-school as it gets.
Monkey's Paw Games
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Making a list of additional resources for all your #OSRJuneJam needs! Will update as I think of more. Here's some starters:
https://www.flickr.com/photos/129824703@N04/albums/72157671625640022 - art!
https://www.oldbookillustrations.com/ - more art!
https://karenswhimsy.com/public_domain_images/ - more art!
https://publicdomainreview.org/ - still more art!
https://www.flickr.com/photos/192445357@N05/galleries - you guessed it!
https://greygnome.com/free-art-assets/ - even more art!
I'll make a twitter post to clear things up but from the jam page:
I may be somewhat of a purist myself - as in "OSR means I can run Keep on the Borderlands without much conversion work" - but for the purposes of this jam, OSR is like porn: you know it when you see it.
Anything you make that "feels" old school is good!
I don't know how others handle it but usually my rough guide is to take the average number of expected adventurers - say 3-8 level 5 adventurers would be an average of six, then figure out how much treasure it takes to get from level 5 to 6, times that by six, and then adjust accordingly to module size or relative difficulty. If it's the kind of module you think warrants a level up at the end, you're done! Typically I'll half or quarter the total treasure, then divvy that up between coins, valuables, and magic items.