CyberStorm Mk-I

Cyberstorm showing all the modules connected.

Cyberstorm with individual modules

Processor: 040@25Mhz, 040@40Mhz or 060@50Mhz
FPU: Internal
MMU: Internal
Max Ram: 128MB
Ram Type: 4 x 72pin SIMM slots.

The Cyberstorm Mk-I is of a modular design and comes in three main parts (4 if you include SCSI II). The main part called the carrier board actually connects into the processor slot on the motherboard. The next component is referred to as the processor daughterboard. This is a small card which contains either an 040@25Mhz, 040@40Mhz or an 060@50Mhz, and usually contains a heat sink and/or fan. The processor daughterboard connects on top of the carrier board in parallel. The third component is the memory daughterboard. This contains 4 x 72pin SIMM slots for adding up to a maximum of 128MB and supports SIMM sizes of 4MB to 32MB in mixed configurations. The memory daughterboard is fitted to the carrier board on top but at right angles. If no memory is intended to be added to the memory daughterboard then it does not have to be fitted. It may not be possible to physically fit this card in a standard A3000 desktop and it may also be necessary to perform an INT-2 modifcation, but this has not been confirmed. If you have the SCSI-II module attached, it may conflict with the internal SCSI controller in an A3000 series machine.

Jumper Settings

For an 040@25Mhz, the jumper marked INT on the A4000 motherboard needs to be set for the Internal Clock Signal. For an 040@40Mhz and 060@50Mhz the jumper needs to be set to EXT for an external Clock Signal.

Main Jumpers

Jumper Name Position Function
IPEND ON No mainboard CPU
CBR ON CPU on mainboard
DIAG Pos 1-2 Enable Diagnostic ROM
Pos 2-3 Disable Diagnostic ROM
ROM Size Pos 1-2 16bit ROMs
Pos 2-3 8bit ROMs
ROM Count Pos 1-2 Two ROMs Installed
Pos 2-3 One ROM Installed
JPA Pos 1-2 Normal RAM Access
Pos 2-3 Fast RAM Access
OPEN Slow RAM Access
MB Burst Pos 1-2 Enable MainBoard burst access
Pos 2-3 Disable MainBoard burst access

RAM Jumpers

Total RAM Bank 0 Bank 1 Bank 2 Bank 3 Jumper Reference
See Diagram Below
4/8/12/16MB 4/0MB 4/0MB 4/0MB 4/0MB A
8/12/16/20MB 8MB 4/0MB 4/0MB 4/0MB B
16/20/24/28MB 16MB 4/0MB 4/0MB 4/0MB C
32/36/40/44MB 32MB 4/0MB 4/0MB 4/0MB D
16/20/24MB 8MB 8MB 4/0MB 4/0MB E
24/28/32MB 16MB 8MB 4/0MB 4/0MB F
40/44/48MB 32MB 8MB 4/0MB 4/0MB G
32/36/40MB 16MB 16MB 4/0MB 4/0MB H
48/52/56MB 32MB 16MB 4/0 4/0 I
64/68/72MB 32MB 32MB 4/0MB 4/0MB J
24/28MB 8MB 8MB 8MB 4/0MB K
32/36MB 16MB 8MB 8MB 4/0MB L
48/52MB 32MB 8MB 8MB 4/0MB M
40/44MB 16MB 8MB 8MB 4/0MB N
56/60MB 32MB 16MB 8MB 4/0MB O
72/76MB 32MB 32MB 8MB 4/0MB P
48/52MB 16MB 16MB 16MB 4/0MB Q
64/68MB 32MB 16MB 16MB 4/0MB R
80/84MB 32MB 32MB 16MB 4/0MB S
96/100MB 32MB 32MB 32MB 4/0 T
32MB 8MB 8MB 8MB 8MB U
40MB 16MB 8MB 8MB 8MB V
56MB 32MB 8MB 8MB 8MB W
48MB 16MB 16MB 8MB 8MB X
64MB 32MB 16MB 8MB 8MB Y
80MB 32MB 32MB 8MB 8MB Z
56MB 16MB 16MB 16MB 8MB 1
72MB 32MB 16MB 16MB 8MB 2
88MB 32MB 32MB 16MB 8MB 3
104MB 32MB 32MB 32MB 8MB 4
64MB 16MB 16MB 16MB 16MB 5
80MB 32MB 16MB 16MB 16MB 6
96MB 32MB 32MB 16MB 16MB 7
112MB 32MB 32MB 32MB 16MB 8
128MB 32MB 32MB 32MB 32MB 9

Bank 0 is closest to the connector. The largest SIMM must always be placed in bank 0, with the second largest in bank 1 and so on.

Thanks to Antoine Dubourg