= AST RESEARCH, INC. TECHNICAL BULLETIN # 1373 12-14-95 = Bravo MS 4/66d Fails to Boot with Pentium Overdrive Processor Upgrade PROBLEM The 83 MHz Pentium Overdrive Processor upgrade may fail in the Bravo MS 4/66d. CAUSE 1. At initial power up, the processor reset line resets too quickly, not allowing the system to boot. 2. The board revision may be lower than that required for a Pentium upgrade. SOLUTION Call AST's Technical Support at (800) 727-1278 and request a system board which matches or exceeds the revision noted below. SYSTEMS AFFECTED AST PART NUMBER AND DESCRIPTION 501429-XXX Premmia MX 4-66d 501432-XXX Premmia MX 4-100 501440-XXX Bravo MS 4-33s 501441-XXX Bravo MS 4-50s 501442-XXX Bravo MS 4/66d 501443-XXX Bravo MS 4-100T 501541-XXX Advantage! CMT 2-66d 501586-XXX Bravo MS-L 4-66d 501611-XXX Bravo MS 4-50s 501612-XXX Bravo MS 4-50s 501644-XXX Advantage! CMT 2-66d 510356-XXX Bravo MS 4-66d 501655-XXX Bravo MS-L 4-50d 501658-XXX Bravo MS-T 4-66d 510678-XXX Bravo MS 4-66d 501709-XXX PIII+ 4-66d 501803-XXX PIII4 4-100T CAUTION This modification should be performed ONLY by a qualified service technician. It is strongly recommended that this Field Change Notice (FCN) be completed by an AST Authorized Service Center. In no case will AST Research, Inc. be liable for damage to the system and its components, or loss of data caused by improper modification. PREREQUISITES A full backup of all data on the hard drive in the computer is strongly suggested. TIME REQUIRED 30 minutes. STATUS VERIFICATION The revision level of the AST motherboard can be identified by observing the revision letter at the end of the nine-digit part number located on the solder side of the motherboard. PARTS REQUIRED AST Part Number Description Revision 202612-001 PCBA MBD B468 PCI B 202612-003 PCBA MBD BMS4-50S 4MB/1MB 5.0V H 202612-004 PCBA MBD BMS4-50S 8MB/1MB 5.0V H 202612-005 PCBA MBD BMS4-66D 4MB/1MB 64K J 202612-006 PCBA MBD BMS4-66D 8MB/1MB 64K H 202612-007 PCBA MBD BMS4-100T 4MB/1MB 64K F 202612-008 PCBA MBD BMS4-100T 8MB/1MB 64K F 202612-009 PCBA MBD BMS4-33S 4MB/1MB 0CACHE F 202612-010 PCBA MBD BMS4-33S 8MB/1MB 0CACHE F 202612-100 PCBA MBD BMS4-00 0MB/1MB 3.3V H 202612-101 PCBA MBD BMS4-00 0MB/1MB 5.0V H 202612-102 PCBA MBD BMS4-33S 0MB/1MB 5.0V G 202637-002 PCBA MBD PRM MX4-66D 8MB 0CACHE5.0 T 202637-003 PCBA MBD PRM MX4-66D 8MB 256K 5.0V Z 202637-004 PCBA MBD PRM MX4-66D 16MB 256K 5.0V AA 202637-005 PCBA MBD PRM MX4-100T 8MB 0CACHE 3.3V U 202637-006 PCBA MBD PRM MX4-100T 8MB 256K 3.3V Y 202637-007 PCBA MBD PRM MX4-100T 16MB 256K 3.3V Z 202637-008 PCBA MBD PRM MX4-66DW/WB 8MB 0C 5V T 202637-009 PCBA MBD PRM MX4-66DW/WB 8MB 256K 5V U 202637-010 PCBA MBD PRM MX4-66DW/WB 16MB 256K 5V U 202637-012 PCBA MBD PRM MX4-66D 8MB 0C 5V R 202637-013 PCBA MBD PRM MX4-66D 8MB 256K 5V U 202637-014 PCBA MBD PRM MX4-66D 16MB 256K 5V W 202637-015 PCBA MBD PRM MX4-100T 8MB 0C 3V R 202637-016 PCBA MBD PRM MX4-100T 8MB 256K 3V W 202637-017 PCBA MBD PRM MX4-100T 16MB 256K 3V W 202637-018 PCBA MBD PRM MX4-66DWB 8MB 0C 5V P 202637-019 PCBA MBD PRM MX4-66DWB 8MB 256K 5V S 202637-020 PCBA MBD PRM MX4-66DWB 16MB 256K 5V S 202637-100 *PCBA MBD PRM MX 0MB/0MB 3.3V K 202637-101 *PCBA MBD PRM MX 0MB/0MB 3.3V M 202637-111 PCBA MBD PRM MX 0MB/0MB 3.3V R 202637-112 PCBA MBD PRM MX 0MB/0MB 5.0V R 202670-001 *PCBA MBD DX2-66 16MB/512K 256KC 5V D 202670-002 PCBA MBD DX2-66 16MB/512K 256K 5V K 202670-101 *PCBA MBD DX-00 0MB/512K 0CACHE 5V C 202670-102 PCBA MBD DX-00 0MB/512K 0C 5V J 202694-003 PCBA MBD BMS-L 4-50D 4MB/1MB 64K 5V X 202694-004 PCBA MBD BMS-L 4-50D 8MB/1MB 64K 5V G 202694-005 PCBA MBD BMS-L 4-66D 4MB/1MB 64K 5V G 202694-006 PCBA MBD BMS-L 4-66D 8MB/1MB 64K 5V G 202694-007 PCBA MBD BMS-L 4-66DW/WB 4MB/1MB 64K G 202694-008 PCBA MBD BMS-L 4-66DW/WB 8MB/1MB 64K G 202694-009 PCBA MBD BMS-L 4-50DW/WB 4MB/1MB 64K G 202694-010 PCBA MBD BMS-L 4-50DW/WB 8MB/1MB 64K G 202694-011 PCBA MBD BMS-L 4-66D/WB 1MB/1MB 64KRCV F 202694-012 PCBA MBD BMS-L 4-66D/WB 4MB/1MB 64KRCV F 202694-013 PCBA MBD BMS-L 4-50D 4MB/1MB 64K E 202694-014 PCBA MBD BMS-L 4-50D 8MB/1MB 64K E 202694-015 PCBA MBD BMS-L 4-66D 4MB/1MB 64K E 202694-016 PCBA MBD BMS-L 4-66D 8MB/1MB 64K E 202694-017 PCBA MBD BMS-L 4-66WB 4MB/1MB 64K E 202694-018 PCBA MBD BMS-L 4-66WB 8MB/1MB 64K E 202694-019 PCBA MBD BMS-L 4-50WB 4MB/1MB 64K E 202694-020 PCBA MBD BMS-L 4-50WB 8MB/1MB 64K E 202694-101 *PCBA MBD BMS-L 00 0MB 0CACHE 5V F 202694-111 PCBA MBD BMS-L 00 0MB 0C 5V S 202694-112 PCBA MBD BMS-L 00 0MB/1MB 0C RCV S 202695-001 PCBA MBD CMT4-66 8MB/1MB CYRX W 202695-002 PCBA MBD CMT4-66 8MB/1MB CYRX RCVDO W 202695-101 *PCBA MBD CMT4-00 0MB/1MB 5.0V P 202695-111 PCBA MBD CMT4-00 0MB/1MB 5.0V U 202695-112 *PCBA MBD CMT4-00 0MB/1MB 5V RCV T 202705-001 PCBA MBD BMS 4-50D 4MB/1MB 64K F 202705-002 PCBA MBD BMS 4-50D 8MB/1MB 64K E 202705-003 PCBA MBD BMS 4-66D 4MB/1MB 64K F 202705-004 PCBA MBD BMS 4-66D 8MB/1MB 64K F 202705-005 PCBA MBD BMS 4-50S 4MB/1MB 0CACHE5.0V E 202705-006 PCBA MBD BMS 4-50S 4MB/1MB 0CACHE5.0V E 202705-007 PCBA MBD BMS 4-100T 4MB/1MB 64K B 202705-008 PCBA MBD BMS 4-100T 8MB/1MB 64K B 202705-009 PCBA MBD BMS 4-33S 4MB/1MB 64K D 202705-010 PCBA MBD BMS 4-33S 8MB/1MB 64K D 202705-011 PCBA MBD BMS 4-66D 8MB/1MB 256K AA F 202705-012 PCBA MBD BMS 4-66D 16MB/1MB 256K AA G 202705-013 PCBA MBD BMS 4-66D W/WB 4MB/1MB 64K F 202705-014 PCBA MBD BMS 4-66D W/WB 8MB/1MB 64K F 202705-017 PCBA MBD BMS 4-50S 8MB/1MB 256K F 202705-018 PCBA MBD BMS 4-66DW 8MB/1MB 64KRCV G 202705-019 PCBA MBD BMS 4-66DW 4MB/1MB 64KRCV G 202705-020 PCBA MBD BMS 4-00 1MB 5V RCVDO G 202705-021 PCBA MBD BMS 4-66D 16MB/1MB 256K RCV H 202705-022 PCBA MBD BMS 4-100T 8MB/1MB 256K E 202705-023 PCBA MBD BMS 4-66D W/WB 8MB/1MB 256K E 202705-024 PCBA MBD BMS 4-66D W/WB 4MB/1MB 256K D 202705-025 PCBA MBD BMS 4-100T CRX 4M/1M 256K A 202705-026 PCBA MBD BMS 4-100T 4MB/1MB 256K A 202705-100 PCBA MBD BMS 4-00 0MB/1MB 3.3V F 202705-101 PCBA MBD BMS 4-00 0MB/1MB 5.0V E 202705-102 PCBA MBD BMS 4-33S 0MB/1MB 5.0V B 202705-103 PCBA MBD BMS 4-00 0MB/1MB 5V RCVIDEO F 202705-104 PCBA MBD BMS 4-00 0MB/1MB 3.3V CRX A 202705-104 PCBA MBD BMS 4-00 0MB/1MB 3.3V CRX A TOOLS REQUIRED: Standard computer tools. INSTALLATION PROCEDURE Refer to the system Hardware Maintenance Manual. Removal and replacement of system "Field Replaceable Units" (FRUs) should only be performed according to the installation procedures approved and prescribed by AST Research, Inc. Remove the system board according to procedures approved and prescribed by AST Research, Inc. Reassemble the system. CHECK-OUT PROCEDURE To verify proper operation of the system upon completion of this FCN, follow the setup and test procedures described in the AST User's Manual. NOTE Warranty reimbursement for this FCN requires prior AST Research, Inc. approval. The warranty on this system will become VOID if this FCN is completed by ANYONE other than an AST Authorized Service Center.