There are many Eproms and Other memory devices to be found in a monarch.
These Include
Address decode eproms eg MCPUMM N2.0
On line Main cabinet software (MMEQ) eg N2.1
Off line main cabinet software (MOFF) N2.0
16k Customer / Configuration data base on EEprom on daughter card
4k customer / configuration on earlier systems on eprom daughter card (AND RAC)
Exchange / trunk card software eg M4 XCH 1.10
Both the monarch on line and off line software read the customer database, to find out things like.
1) What sort of card is in what slot
2) What the numbering scheme is
3) What restrictions are on trunks and Extensions
4) Where the console is plugged in.
Not all databases are compatible with all software versions.
When the configuration on the 1 Meg memory card cannot be read for some reason, eg the battery has gone flat, a VCST needs to be done the reads the eeprom into the ram on the main board.
The data on the eeporms does not last forever, the data sheet says 10 years ..
So I would advise you make sure you do a save from ram to eeprom at least every 10 years
Stored on 2 eproms in on the 8088 CPU card IC34 and IC35
devices include Texas Instruments TMS 2764-25JL, MBM2764-25
On line main Cabinet software (MMEQ)
Stored on 8 Eproms on the 1 Meg memory card
The eproms are 27c512s 64k x 8 bit eprom and there are 8 of them installed on 1 meg memory card
On 6? eproms
2 x NEC D2764D-2 8K x 8bit UV Erasable PROM
EPROM 1 CHECKSUM AB20 (HEX), AC87, ACED - Oh dear corrupt !
EPROM 2 checksum 7090, 6FA7, 8F1F - Corrupt too !
and
4 x NEC D27C1001A-12
EPROM 3 - 1FBC
EPROM 4 - 4BA2
EPROM 5 - 70CA
EPROM 6 - FBD7
1 EPROM NEC 27C1001A-15 128K X 8 BIT CHECKSUM EA27 (HEX)
Mitsubishi Eprom M5L2732k 4k x 8 bit checksum 2749 (HEX)
This software is stored on a Mitsubishi M5L2732K 4x x 8 bit EPROM
CHECKSUM 0FFB(HEX)
IC 16 on cpu 8088 card
device N82S181N, Signetics, IC,PROM,1KX8,TTL,DIP,24PIN,PLASTIC
RAC Passwords are
A2062C
R6942C
E2602C
SA2496 ?
:020000040000FA
:2000000008003898149FFFFFFFFFFFFFFFFFFFFF08003898149FFFFFFFFFFFFFFFFFFFFFDE
:20002000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE0
:200040003958FFFFFFFF413230363243523639343243453236303243534132343936FFFFA2
:200060000D0A0A0A4D4F4E4152434820504142582020200D0E0A0A0D3031323238353235CD
:200080003232340D0A0A5354454144204D43414C50494E202620434F204C54440D0A435567
:2000A0004D4D45525344414C45205052494E5420574F524B530D0A43554D4D45525344418B
:2000C0004C450D0A4341524C49534C450D0A3031323238203532353232340D0A4040FFFF2C
:2000E000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF20
RAC FIRMWARE VERSION
M RAC 3.0
MONARCH PABX
01228525224
STEAD MCALPIN & CO LTD
CUMMERSDALE PRINT WORKS
CUMMERSDALE
CARLISLE
01228 525224
PLEASE SIGN ON
SA2496?.....
REJECTED - PLEASE TRY AGAIN
?E.2.6.0.2.C.
IF YOU WISH TO HAVE ACCESS TO MMI PLEASE PRESS Y IF NOT PLEASE PRESS N
YY
CONNECTING YOU TO MMI - IT MAY TAKE SEVERAL SECONDS FOR THE SYSTEM TO REPLY
MONARCH - THE DIGITAL CALL CONNECT SYSTEM
SOFTWARE RELEASE M MEQ N2.4
PRODUCT - CD SYSTEM
SITE CODE - DJ025U00/000
OSL PLEASE
THEN SET TIME & DATE
? OSLM 9999
REJECTED
? OSLC 142
REJECTED
? *100*142#
REJECTED
? OSLS 2783
REJECTED
?
This 2k software is stored on a OTP (one time programmable) Phillips MAB 8049H 8 BIT Microcontroller