1. Digital Filter Mode Switch Closed Orbit Mode Fast Abort Buffer Slow Abort Buffer Profile Frame Buffer Display Frame Buffer - Switch activated every 2ms - Switch deactivated on abort $47 or $4B. Switch reactivated after 1 st turn acquisition -Switch activated by TCLK $75 shot data event -Switch activated by user configur- able event ($78) Data at end of FIFO is dicarded FIFO full generates error. Pointer reset on TCLK $C2. 1024 pts 128 pts All Closed Orbit Mode switches are interrupted by TBT mode. First Turn Buffer - Switch activated by delayed beam synch clock $7C. Switch remains activated for specified number of turns. 8192 pts TBT Mode FIFO full generates error Switch activat ed every 2ms Fast Time Plot Buffer User Data Buffer Data at end of FIFO is discarded 128 pts -Switch activated by user configur- able event First Turn Closed Orbit Buffer -Value derived as an average of 64 points after 500 th turn of injection captured in turn- by-turn buffer First Turn - Switch changed by change in Tevatron state device that listens to $4B and $5C events. - Switch activated every 1sec Switch deactivated on abort $47 or $4B -Switch reac- tivated after 1 st turn acquisition Turn by Turn Buffer - Switch activated by delayed beam synch clock $DA. Switch remains activated for specified number of turns. 8192 pts FIFO full generates error Tevatron BPM System

2. Digital Filter Mode Switch Closed Orbit Mode Spare Profile Frame Buffer Display Frame Buffer - Switch activated every 2ms - Switch deac- tivated on $26 or $2x -Switch reac- tivated after 1 st turn acquisition -Switch activated by User Configurble Tclock Event ($7A) -Switch activated by user configur- able event ($7B) FIFO full generates error. Pointer reset on TCLK $79. 1024 pts 128 pts All Closed Orbit Mode switches are interrupted by TBT mode. First Turn Buffer - Switch activated by delayed beam synch clock $xx. Switch remains activated for specified number of turns. 8192 pts TBT Mode FIFO full generates error Switch activat ed every 2ms Fast Time Plot Buffer User Data Buffer Data at end of FIFO is discarded 128 pts -Switch activated by user configur- able event First Turn Closed Orbit Buffer -Value derived as an average of 64 points after 500 th turn of injection captured in turn- by-turn buffer First Turn - Switch changed by Tclk $79, or TBT Event(??). - Turn by Turn Buffer - Switch activated by delayed beam synch clock $??. Switch remains activated for specified number of turns. 8192 pts FIFO full generates error Tevatron Hand-Me-Down System for MI 2.5 Mhz 53 Mhz 2.5 and 53 Mhz filters changed by user control

3. Digital Filter Mode Switch Closed Orbit Mode Profile Frame Buffer Display Frame Buffer - Switch activated every 2ms when system is in closed orbit mode -Switch activated by User Configurable Tclock Event ($7A) -Switch Activated by User configurable event ($7B) FIFO full generates error. Pointer reset on next state. 128 pts All Closed Orbit Mode switches are interrupted by TBT mode. Flash Turn Buffer Switch activated by MIBS clock $xx, $7A, $D6, $D8 for first turn; $A1, $A6, $74, $75, $76, $7B, $7C, $7D, $7E for last turn and RRBS clock $A3, $A6, $A7 for first turn; $A0, A1, $A2 for last turn. Switch remains activated for 512 turns. 512 pts 20 Buffers TBT Mode (see detail) FIFO full generates error Fast Time Plot Buffer User Data Buffer Data at end of FIFO is discarded 128 pts -Switch activated By user configurable event First Turn Closed Orbit Buffer -Value derived as an average of 64 points after 500 th turn of injection captured in turn- by-turn buffer Flash Buffer - Switch changed by SET FILTER message - Turn by Turn Buffer - Switch activated by delayed beam synch clock $??. Switch remains activated for specified number of turns. 2048 pts FIFO full generates error State System for MI 2.5 Mhz 53 Mhz 2.5 and 53 Mhz Data select and Filter attenuator changed by SET FILTER message 20 pts

4. First Flash Turn Buffer Switch activated by MIBS clock $xx, $7A, $D6, $D8 for first turn; $A1, $A6, $74, $75, $76, $7B, $7C, $7D, $7E for last turn and RRBS clock $A3, $A6, $A7 for first turn; $A0, A1, $A2 for last turn. Switch remains activated for 512 turns. 512 pts TBT Mode FIFO full generates error First Turn Closed Orbit Buffer Value derived from an average points. Flash Buffer Turn by Turn Buffer - Switch activated by delayed beam synch clock $??. Switch remains activated for specified number of turns. 2048 pts FIFO full generates error Turn by Turn Mode Detail 20 pts Second Flash Turn Buffer 512 Pts512 pts 20 Th Flash Turn Buffer Buffer contains The first or last turn flash data.