Difference between revisions of "COIM Modification"
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(Created page with "The Motorola Console Operator Interface Module (COIM) uses a 18 bit wide (0x40000) bus address bus supporting 4 256kb flash chips. The Quantar uses a 19 bit wide address bus...") |
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# Install the proper 29F040B-90 PLCC Flash memory chips and program. The Conventional SIMM only needs U1-U4 populated | # Install the proper 29F040B-90 PLCC Flash memory chips and program. The Conventional SIMM only needs U1-U4 populated | ||
| − | <gallery mode="packed-hover" widths= | + | <gallery mode="packed-hover" widths=200px heights=200px> |
COIM SIMM module modified back.jpg | SIMM Back | COIM SIMM module modified back.jpg | SIMM Back | ||
COIM SIMM module modified front.jpg| SIMM Front | COIM SIMM module modified front.jpg| SIMM Front | ||
</gallery> | </gallery> | ||
Revision as of 13:23, 26 December 2015
The Motorola Console Operator Interface Module (COIM) uses a 18 bit wide (0x40000) bus address bus supporting 4 256kb flash chips. The Quantar uses a 19 bit wide address bus (0x80000) for 512k flash chips. The chips are almost identical so the board only needs a few simple modifications.
The modification is easy:
- Remove 5 caps on the back closest to SIMM contacts
- Remove the 0 Ohm resistor above U8 silkscreen
- Remove 3 caps on front closest to SIMM contacts
- Move 4, 0 Ohm resistors on front closer to SIMM contacts
- Install a jumper on the back from pin 34 to second pad above silkscreen "U7". This should be Pin 1 of the chips.
- Depending on if this is a conventional or InteliRepeater SIMM install jumpers as follows
- If Conventional install jumpers from 80,79,75,74,73
- If IR SIMM install jumpers from 80,79,76
- Install the proper 29F040B-90 PLCC Flash memory chips and program. The Conventional SIMM only needs U1-U4 populated
SIMM Back
SIMM Front
