A 416120-00 A
B 416124-00 B
C 416121-00 B
J3 Factory use only
J4 Factory use only
J6 50 pin header
RN2 BI resistor network 899-5, R220/330
RN3 BI resistor network 899-5, R220/330
F1 - From Peter- The fuses are Schurter (Switzerland) microfuses of the MSF-125 series, order no. 0034.9875 - a single package is 10 pieces at 125V / 1.6A, rated "quick acting F". Schurter has an internet page with product catalogues in .PDF at www.schurter.ch

Transfer rates
        Up to 8 MBytes/sec bus master DMA on the Micro Channel bus
        5 MBytes/sec synchronous burst on the SCSI bus
        2 MBytes/sec asynchronous burst on the SCSI bus

RAID Support
The AHA-164x supports RAID Level 0, 1, and 5 with the help of third party software.
    Ed. Whose software?

W95 and DMA Channels
   It seems as if W95 has the choices of DMA Channels 5, 6, and 7 available. You may have to go into the System Programs (a.k.a. Setup) and change the Arbitration Level to one that W95 is looking for.

No SCSI BIOS Installed
1.   The AHA1640 says no SCSI BIOS installed. The chips are there on the card.

The Bios is installed under following circumstances:
- no "drive C: " (Hex-80 device) previously installed
- drivesize is 1GB or below
- BIOS is enabled under the machine setup and on a valid adress

2. I can't get it to boot a HDD which boots fine form a Future Domain.
     If the drive is over 1GB and / or low-level formatted with a different
translation schem it will not be recognized anyway. The Adaptec Boot BIOS is
"old fashioned" and has a 1GB-limit. 
   It is principially the same as used on the ISA AHA-1540B (not -C or -CF) and has no CTRL-A support and uses the DOS-compatible HD translation, which is a bit "register-width challenged".
   You need to LL-Format the drive with Adaptecs SCSIFMT ... which requires a boot disk with the ASPI4DOS.SYS to have the drive under ASPI-Manager control. The ASPI Manager is capable to handle drives over 1GB - the Boot-Bios isn't.
 

 BASEDEV= AHA164x.ADD ---------------------------------------
                                  |- /ET -|
                                  +- /V --+
----------------------------------------------------------------|
            |                                    | |
            +- /A:n -------------------------------+
                     |  |- /!DM ---------------|  |
                     |  |        +- :unitlist -|  |
                     |  |- /!SM ---------------|  |
                     |  |        +- :unitlist -|  |
                     |  +- /UR ----------------+  |
                     |                            |
                     +------------  /I -----------+

Adapter BIOS
   This selects the memory location of the host adapter's BIOS ROM. To disable the host adapter's BIOS ROM, choose the  'BIOS DISABLE' option.  Note, if two AHA-1640 host adapters reside in the system, one of them must have its BIOS ROM disabled. 
      <DC000h>, D8000h, D4000h, D0000h, CC000h, C8000h, BIOS disablednameditem

I/O Port Address
   This is the I/O Port of the host adapter
      <330h>, 334h, 234h, 134h, 230h, 130h"

Arbitration Level
   This selectes the DMA channel the host adapter will use to transfer data.
      <Level_5>, Level_6, Level_7, Level_4, Level_3, Level_1, Level_0"

Interrupt Level
   This selects the interrupt channel the host adapter will use to report status.
      <Int_15>, Int_14, Int_12, Int_11, Int_10, Int_9

SCSI Address
     SCSI address of the host adapter
      <Addr_7>, Addr_6, Addr_5, Addr_4, Addr_3, Addr_2, Addr_1, Addr_0

Sync Xfer Started by AHA-1640 Yes/No
   Synchronous transfer on the SCSI bus will be started by the  host adapter if 'Yes'.
     <Yes>, No

SCSI Parity Checking On/Off
    The host adapter will check SCSI Parity if  'On'
    <On>, Off

Fairness On/Off
   Bus Arbitrations Fairness. This controls whether the adapter will release control of the bus when it has been using it exclusively.
      <On>,Off