CompuServe Messages

The following is my problem: SYSTEM: Amiga 500 (Rev. 5 Motherboard) 501 Memory Expansion 1.3 ROM Fatter Agnus (checked good) [Sub System w/ A2090 & Octobyte 2M] SETUP: Workbench1.3 JRBeep installed in Startup-Sequence (replaces screen flash w/beep) ARP installed (replaces C: commands) PROBLEM/S: Selecting Version from Workbench to cause a beep crashes the machine just after the sound is heard. No guru message displayed. Passes normal sounds i.e. voice/digitized sounds. SCENARIO 1: Fatter Agnus installed. Sub System connected. Drive Controller installed. Memory installed. Insert Workbench screen displayed. Disk inserted. Insert Workbench screen disappears. As system just starts to look at disk (drive motor doesn't seem to turn on yet) GURU 4.00001970 pays a visit. SCENARIO 2: Fatter Agnus installed. Sub System connected. Drive Controller installed. Insert Workbench screen displayed. Disk inserted. System boots. ARP assign command will only accept single parameters. Avail command returns 0 fastmem and 1M chipmem. System crashes (no GURU) reboots and cannot find Hard Drive when Version used to produce a beep or TurboCopy beeps. Passes normal sounds i.e., voice/digitized sounds. Acts same with Comodore C: commands. SCENARIO 3: Fatter Agnus installed but wired for Fat Agnus. Sub System connected. Drive Controller installed. Insert Workbench screen displayed. Disk inserted. System boots. ARP assign command accepts multiple parameters. Beeps work. Memory not tried. Any insight, wisdom, or know how, to make this Fatter Agnus chip work? My first consern is to make the Fatter Agnus work on a stand alone 500. I hope once this is acomplished the rest of the system will fall into place. Any comments welcomed.