Home Page The Club Computers News Links Glossary EYAWTK

Everything You Always Wanted To Know
But Were Too Polite To Ask

Amiga Technical References

MacroSystem Development Warp Engine

Memory Settings:

SIMM Speed CPU Speed
60ns 40MHz
60 or 70ns 33MHz
60, 70 or 80ns 25 or 28MHz

NOTE: It is possible to use slower speed SIMM modules by adding a wait state to memory accesses (putting a shunt on Jumper E), yielding a slower 5/3/3/3 access. This will allow you to use 80ns memory with a 33 or 40MHz process with reduced performance.

B C Description Largest SIMM
Off Off Double Sided, 16 megabit Density 32 megabytes
Off On Double Sided, 4 megabit density 8 Megabytes
On Off Single Sided, 16 megabit Density 16 Megabytes
On On Single Sided, 4 megabit Density 4 Megabytes

Examples:
Four 4 megabyte SIMMs: B=On, C=On
One 16 megabyte SIMM: B=On, C=Off

Note: If you install a 16-megabyte module first, and you install an 8 Megabyte SIMM module afterwards, you will need to set your jumpers to: B=OFF, C=OFF

SCSI Settings:

K J H Description
Off Off Off SCSI Autoboot Disabled
Off Off On Delay, LUN Scan, No Synch
Off On Off Delay, LUN Scan, Synch 200ns
Off On On Delay, LUN Scan, Synch 100ns
On Off Off LUN Scan, Synch 200ns
On Off On LUN Scan, Synch 100ns
On On Off Synch 200ns
On On On Synch 100ns

Delay is a 10 second pause to allow slower drivers to power up before being queried upon startup.
Logical Unit Number scan searchs for all LUNs of a particular ID.
Sychronous negotiation allows a quicker protocol handshake and data transfer from the SCSI device.
Synch 100ns is for fast synchronus, which allows a faster transfer rate, while Synch 200ns is for slower.

Other Notes:

If you have an early Amiga 4000 that has a processor module with a 28MHz oscillator in U104, change the jumpers at JP100 and JP104 from "INternal Clock" to "External Clock".

JP1: SCSI Bus termination power.
TP1: Reserved.
TP2: Reserved.
JP2 Jumper Description Off On
A Mode Select 040 Active 040 Disabled
B SIMM Bank Size Dual Sided Single Sided
C SIMM Module Bank Size 16 Megabit 4 megabit
D Wait State No Wait State Wait State
E Reserved Reserved Reserved
F MMU Disable MMU Enabled MMU Disabled
G Cache Disable Caches On Caches Off
H See Above Chart See Above Chart See Above Chart
J See Above Chart See Above Chart See Above Chart
K See Above Chart See Above Chart See Above Chart
L Reserved Stays ON Reserved Stays ON Reserved Stays ON

My memory does not appear, why?
Check your SIMMs() to make sure that they are either 4M, 8M, 16M or 32M. Check your jumper settings for the type of memory that you have.

My SCSI device does not appear, why?
Try setting K, J and H jumpers to "Delay, LUN Scan, NoSynch". Check all cabling to the device, including power. Follow the SCSI cable back to make sure it's connected to the WarpEngine. Check to make sure that there are terminator resistors in the WarpEngine, and on the last device connected on the SCSI chanin. There should only be 2 devices terminated on the SCSI cable, usually the WE is one of them.


Copyright 2000 Amiga Auckland Inc. All rights reserved.
Revised: June 16, 2005.