Difference between revisions of "COIM Modification"
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| − | 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 Motorola Console Operator Interface Module (COIM) uses a 18 bit wide (0x40000) bus address bus supporting 4 256kb flash chips. The Quantar/ATAC 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: | The modification is easy: | ||
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COIM SIMM module modified front.jpg| SIMM Front | COIM SIMM module modified front.jpg| SIMM Front | ||
</gallery> | </gallery> | ||
| + | |||
| + | The COIM SIMM is available from Motorola for about $40, Part number BLN7062D. | ||
| + | |||
| + | There are programmed SIMMs being [http://www.ebay.com/itm/201453018977 sold on eBay] as of December 2015 for $75. | ||
| + | |||
| + | = [[ASTRO-TAC|ATAC]] conversion = | ||
| + | |||
| + | This is the same as above, but setup for 4 Megabit by 8 devices. This is only pin 76 brought low/ground. | ||
| + | |||
| + | '''Note the ATAC does care about this being set.''' | ||
| + | |||
| + | If converting to a ATAC 3000, Only the first bank is needed. The 9600 needs both banks. | ||
| + | |||
| + | = Files= | ||
| + | |||
| + | [[media:JEDEC 80pin SIMM notes.pdf| JEDEC Flash SIMM Standard]] | ||
| + | |||
| + | [[Category:Quantar]] | ||
| + | [[category:ATAC]] | ||
Latest revision as of 23:14, 3 April 2019
The Motorola Console Operator Interface Module (COIM) uses a 18 bit wide (0x40000) bus address bus supporting 4 256kb flash chips. The Quantar/ATAC 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
The COIM SIMM is available from Motorola for about $40, Part number BLN7062D.
There are programmed SIMMs being sold on eBay as of December 2015 for $75.
ATAC conversion
This is the same as above, but setup for 4 Megabit by 8 devices. This is only pin 76 brought low/ground.
Note the ATAC does care about this being set.
If converting to a ATAC 3000, Only the first bank is needed. The 9600 needs both banks.
