Wow....that's a 10 yr old plotter now and no longer supported by HP.
After 8 reliable years, mine died back in 2007....broken belt and print head prob. Techies weren't sure about available parts.
It needs a direct-jet box to work with ethernet to a router or to your macbook. No USB port, only a parallel port & a another kind of port- not ADB.
Should still work with the direct box & OS10.5 so long as the drivers from HP or ArchiCAD are OK. I remember it was a sloooow printer in ArchiCAD so I stayed with the 'plot' mode.
OH!....it had limited ram so that needs to be maxed out otherwise it will not print normal size print or plot files generated by AC 12.
Not sure of this either, but I recently saw that HP would be discontinuing the #72 cartridges at some future point. I would check into this since 400's, 450's etc, all used them.
Good Luck!
Mark
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ArchiCAD 12 2523 USA Full + 11, 10, 9 & 7, Mac G5 Dual 2.3 Ghz, 1.5 Gb OSX.4.11, HP T1100, Epson R1800
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Mark Wallace Architect
Mark R. Wallace AIA
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MacBook 2.53 Ghz, Intel Core i5, 8 Gb,
Mac OSX (Sierra 10.12.6,
ArchiCAD 22 USA Full, +21, & 20.