Hi, I'm sort of stuck. The place I used to use for programming went out of business and I need to have four different programs put onto eight TTL 2K (256x8) 20 pin PROMs, two units of each program. The PROMs that will work for the application are: Definitely will work: NAT 74S471 SIG 82S135 Most likely will work, but I haven't tried these: Fujitsu 7118 MMI 6309 TI 28L22 Can anyone possibly help me out on short notice? What would this run cost? I've just subscribed to this list, so I'm not yet receiving posts, but I can be emailed at Chris at ChrisPappas.com. Thank you, Chris