Downtown Doug Brown goes into detail about recent Mac ROMs for Quadras and how these ROMs differ from previous Mac versions.
If you’re interested in the Classic Mac scene these days, you’re probably familiar with custom Mac ROM SIMMs such as ROM-inator II. if not, Here is some introductory material about them. JDW also made Great video on YouTube explaining them.
One of the things you usually discover when searching for information about these programmable ROMs is that they are compatible with the oldest 68030-based desktop Macs: SE/30, IIx, IIcx, IIci, IIfx, and IIsi. The most common use for it is to prepare a bootable custom ROM using Driver Rob Brown, Big Mess o’ Wires driver Based on ROB, OR Garrett Workshop Driver. In general, all compatible ROM images use IIsi ROMs that are capable of booting any of the Macs mentioned above.
What you may not know is that most newer 68k Macs also have provisions for a ROM SIMM socket, but apart from the first Quadras (700/900/950) which always had the socket installed, these are usually not populated. Some production or prototype units have this, but most just have empty holes filled with solder where the socket will be placed.
Check out Doug’s comprehensive analysis of ROMs and how to prepare them for later Macs in the post here.
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