On Tue, Sep 8, 2015 at 1:19 PM, Sean Caron <sca...@umich.edu> wrote: > The median listing price for them on eBay for a 29B with pack seems to be > around $3-400 which IMO is a little steep for a 30+ year old PROM > programmer. Hopefully your best offer successfully accepted was much lower! > I think the part cost on the PROMs pales in comparison.
You can currently buy a BP Microsystems CP-1128 for $38.50 shipped on eBay: http://www.ebay.com/itm/181853494660 For the HP 21MX PROMs being discussed it supports at least the following: 256x4 tri-state output AM27S21 DM74S287 82S129 / 82S129A 512x8 tri-state output AM27S31 DM74S474 82S141 1024x8 tri-state output AM27S181 82S181 / 82S181A / 82S181B / 82S181C