Features & Overview
This is a brand-new ROM card that installs into the PDS slot of the Macintosh SE/30, completely bypassing the aging and often unreliable ROM SIMM socket. It provides stable contact and long-term reliability. Functionality is based on the previously released SMC ROM SIMM.
 
Included in the Package
The following components are included with this product:
PDS ROM Card (for Macintosh SE/30)
Flashed EPROMs (Pre-installed　□ / Not installed　□) depending on selected configuration
Test Clip (for pin 27 of the GLUE chip)
Female-to-Female Jumper Cable (for connecting the test clip to JP2 on the ROM card)
 
Compatible Model: Macintosh SE/30
Features:
Bootable ROM Disk
32-bit Clean  *using System 7.0 or later, 8MB or more is installed
Memory Checksum Disabled
Icon customization (*with the Crucible app)
Crucible V2.0 download <<here>>
Uses four 29F040 chips for a total capacity of 2MB
Compatible with popular EPROM programmers (e.g. T48)
 
*If you purchase a PDS ROM card without EPROM chips, please understand that we will not be able to provide support. It may be difficult to provide support because even experienced enthusiasts may fall into unexpected traps. Thank you for your understanding.
 
Installation Instructions
Installing the PDS ROM card is mostly straightforward—simply plug it into the SE/30's PDS slot. However, one additional jumper connection from the logic board is required. This involves attaching a test clip to pin 27 of the GLUE chip (UI8) on the logic board.
Remove the original ROM SIMM card.
Locate the GLUE chip:
On the logic board, find the UI8 GLUE chip next to the 68030 CPU (UK8). This is where the jumper connection must be made. Take care not to confuse it with other nearby chips.
Identify pin 27:
Pin 27 on the GLUE chip corresponds to the ROM SIMM signal. It is the sixth pin from the end. While an incorrect connection is unlikely to cause damage, proceed with caution and double-check your pin count.
Attach the test clip:
Use a small test clip that can clamp from both sides of the chip. For a secure connection, clip closer to the base of the PCB. If you plan to use the PDS ROM long-term, we recommend soldering a wire directly to pin 27. Corrosion or oxidation on the GLUE chip legs may also make soldering the more reliable option.
Connect the jumper cable:
After attaching the test clip, connect the jumper cable and ensure the clip is firmly gripping pin 27.
Reinstall the logic board:
Mount the logic board back into the SE/30 chassis, ensuring that the jumper cable routes cleanly out through the slot opening of the PDS connector.
Install the PDS ROM card:
Plug the ROM card into the PDS slot, then connect the jumper cable to the JP2 pin header on the card.
 
About the GLUE Chip Jumper
The GLUE chip handles address decoding and control signal generation on the SE/30. When accessing a specific address range, it outputs a signal from pin 27 (UI8) to enable the ROM. This signal is not connected to the bus directly; instead, it was originally routed to pins 11 and 12 of the ROM SIMM (ROM_OE and ROM_CE), enabling both simultaneously by setting /CE = /OE. This simplifies synchronization with the bus.
From the logic board's perspective, this is essentially a ROM Select signal, which goes Low during access.
 
Usage
 
This ROM supports ROM disk booting. To boot from the ROM disk, hold the "R" key during the startup screen.
The ROM disk contents can be customized using Crucible. A brief overview is available on YouTube from This Does Not Compute. We've also created our own detailed instruction video—highly recommended for new users.

https://youtube.com/live/nyBcBQur2Nk?feature=share