This program is by Bill Harrington and is used here by permission.
This program is supplied without representation or warranty of any kind. Bill Harrington and The Museum of HP Calculators therefore assume no responsibility and shall have no liability, consequential or otherwise, of any kind arising from the use of this program material or any part thereof.
/* Start Manual Initialise (see below)*/ Enter peak hr calls then R/S 1 /* Line 01*/ STO + 6 /* N */ RCL 3 /* A */ RCL 6 yx RCL 6 Enter /* x! */ Enter 1 /* Line 09 */ - x = 0 GTO 16 * Last x GTO 09 Rv /* Line16, n! */ / STO + 5 /* Sum(AN/N!) */ RCL 5 / STO 7 /* E1,N (A) */ RCL 6 * RCL 6 RCL 3 - RCL 3 RCL 7 * + / STO 4 /* E2,N (A) */ RCL 3 RCL 6 - RCL 1 * RCL 0 / ex * CHS 1 + /* Svc Level Met */ RCL 2 /* SLA */ x > y /*If SLA not met */ GTO 01 /* Loop */ RCL 6 GTO 00 /* # Agents */ <Manual Steps - because I've used all the program memory> Rv /* Roll down */ Rv <Result> /* Svc Level Met this proportion of the time*/ RCL 4 RCL 6 RCL 3 - / RCL 0 * <Result> /* Av wait time in seconds*/ Set up (for each new call centre SLA): Call duration in secs STO 0 Svcs Lvl Answer time (secs) STO 1 SLA (eg. 0.8 for 80% of time) STO 2 Traffic (A), (ie.Calls/3600*M0) STO 3 Initialise (for each new call volume): 0 -> STO 6, STO 4; 1 -> STO 5 Type peak hr call qty, then R/S Other values: Traffic Intensity (A) is in M3 Erlang B is in M7 Erlang C is in M4
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