A1200 Accelerators

ID #2923

CSA: CSA 1250

CSA: 12-Gauge
Connection: Trapdoor Slot (A1200)

cas12gauge1.jpg

cas12gauge2.jpg

cas12gauge3.jpg

Processor:030@33Mhz, 030@40Mhz, EC030@40Mhz or 030@50Mhz
FPU:Optional 68882@50Mhz (PGA)
MMU:None in EC030s, Internal in full 030s
Max Ram:32MB
Ram Type:1 x 72pin SIMM slot. (EDO RAM works, but is not taken advantage of)

An accelerator which plugs into the trapdoor slot of the A1200. Includes a non-DMA SCSI controller (NCR53c80) capable of transferring about 880k/sec. Optional ROMs can be added to the 12-Gauge to support autobooting for SCSI and shadowing the Kickstart into Fast RAM for improved performance. Apparently an optional network card may also have been available, but it has not been confirmed whether this had ever been released.

Jumpers

Bottom Side:

-+-------------------------------+
=| U62 JP3 CN3|
=| +--+ .. ..|
=| |R | +-------+ : |
=| |O | +----|MC68030| : |
=| |M | |'882| | : |
=| +--+ +----+-------+ : |
=| JP1 X1 CN2 |
=| JP2 ... +-+ (SCSI)|
=| :::::::: | | |
=| +-+ |
=| +-----------------------+
=| |
=| |
-+-------+

Top Side:
-+-------+
=| |
=| |
=| +-----------------------+
=| |
=| |
=| | | |
=| |-----------------------| |
=| SIMM1 |
=| |
=| |
=| |
=| |
=| |
-+-------------------------------+
JumperFunction
JP1Pins 1-2 (50Mhz 030)
Pins 2-3 (non 50Mhz)
JP2 #1Hardware Cache Enabled (Open)
Hardware Cache Disabled (Closed)
JP2 #2MMU Enabled (Open)
MMU Disabled (Closed)
JP2 #3Boot in 030 Mode (Open)
Boot in 020 Mode (Closed)
JP2 #4Use Kickstart ROM (Open)
Use special Boot ROM (Closed)
JP2 #5AutoConfig Enabled (Open)
AutoConfig Disabled (Closed)
JP2 #6Autoboot Enabled (Open)
Autoboot Disabled (Closed)
JP2 #7DRAM Burst Mode Enabled (Open)
DRAM Burst Mode Disabled (Closed)
JP2 #8DRAM Burst Wrap Enabled (Open)
DRAM Burst Wrap Disabled (Closed)
JP3SCSI Termination Power Disabled (Open)
SCSI Termination Power Enabled (Closed)

Contributions to this page by:
Paul Harvey

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Last update: 2009-01-24 20:17
Revision: 1.0

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