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PA3GMP > TECH 27.01.05 13:44l 34 Lines 1430 Bytes #999 (0) @ WW
BID : 9A0028PA3GMP
Read: DG5YM GUEST OE7FMI
Subj: Motorola MCX100 EPROMS
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<DK0WUE<SP7MGD<IZ0AWG<IW8PGT<TU5EX<F3KT<
F3KT<ZS6FB<ZS0DLD<ZS6RO<ZS0MEE
Sent: 050127/1033Z @:ZS0MEE.SRJ.GAU.ZAF.AF #:8577 [Meredale] $:9A0028PA3GMP
From: PA3GMP@ZS0MEE.SRJ.GAU.ZAF.AF
To : TECH@WW
Greetings and salutations, :-)
I'm writing a program to generate EPROM images for a Motorola MCX-100
radio. These radios originally were programmed with either 16 or 32
channels in a 4 bit wide bipolar PROM, that has joined the dinosaurs long
ago. I'll use an EPROM instead. While I'm at it, I'll put all the
frequencies in the 2m band into the EPROM, and use one of the thumb wheels
on the radio to select a 16-channel memory bank, so I can cover the entire
2m band. I'll use the existing 16-position rotary switch on the radio to
select channels in each bank.
I've got a lot of information from the Internet on how to calculate the
division numbers and other PROM bytes for a given frequency, so that
should be no problem. Should.
Because I've already got one EPROM (from an unknown source) that has been
programmed with a number of HAM radio frequencies in the 2m band, and if I
read the contents of the EPROM, it's totally different from what all the
instructions I've found on the web tell me it should be. Still it works.
Question: is there anyone out there who has already done this and can tell
me which way of calculating EPROM divider numbers has proven to be the
correct one?
Any additional info, experiences or pointers (preferably into the right
direction, HI) would be greatly appreciated.
73 Frank ZS/PA3GMP
PA3GMP @ ZS0MEE.SRJ.GAU.ZAF.AF
27 Jan 2005, 11:33
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