The problem the 74287 seems to be a very old part. My programmer will not program it.
To program it you need a programmer. First you need to read the PROM you have, with a programmer, and then determine the data format used for the ID. Once you do this you can determine what data you need to program a new device and manually enter the data. Then program a new device. This is the procedure. 73, ron, n9ee/r >From: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> >Date: 2007/08/25 Sat PM 12:00:43 CDT >To: [email protected] >Subject: RE: [Repeater-Builder] Re: Spectrum - Bipolar Prom for CW ID 'er > >That is the correct PROM. Mine is a 74287.........But how do I program the >prom?..........Also, I don't need 25 of them.....maybe 3.Thanks for the >info.......Now that I know where the PROM is in the CWID board and the part >number maybe I can find someone to program it for me. THANKS! Tim  ----- >Original Message ----- From: skipp025 To: [EMAIL PROTECTED]: 8/25/2007 >12:09:11 PM Subject: [Repeater-Builder] Re: Spectrum - Bipolar Prom for CW ID >'er > >> If the IDer has a PROM then little can and should be done to >> go another way...a new PROM. > >The original prom is probably a 74287 and they easy enough to >find... still. There's a guy on Ebay selling tubes of them for <BR>just over >$2 each, which is a great deal. <BR><BR>LOTof 25 - MH74S287 - TESLA 74S287 - >74287 - ic -NEW<BR>Ebay Item number: 290104898405 <BR><BR>I bought a few tubes >from him and both he and they are the <BR>real deal. <BR><BR>> If you know the >PROM type one might be able to program and <BR>> replace. One problem is the >PROMs are so old they are hard <BR>> to find.<BR>> Depending on the PROM I >might be able to help.<BR>> 73, ron, n9ee/r<BR><BR>Proms don't seem to be that >hard to find.... yet. > >cheers, >skipp > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
