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ADDENDUM TO ISSUE 4 OF THE AXXESS MANUAL OCTOBER 1997
Page 41 of 73
New PC Motherboard
The 80486 PC Motherboard described in the Issue 4
manual has been superceded by a newer 80486 model.
The part number for the new model motherboard is
550.5189. See the drawings below and on the next page
for diagrams of the new motherboard and its changes to
the layout on the back of the PC.
The new model has the floppy and hard disk controllers
built into the motherboard and therefore does not re-
quire a separate Disk Controller Card. Also, the COM2
serial port on the back of the PC now has a DB9 con-
nector rather than a DB25 connector. (To use the DB25
modular adapter from the optional SMDR retrieval
cable kit, first attach a straight-through DB9-to-DB25
converter.)
Config.sys File Change
The new version AXXESSORY Talk applications soft-
ware modifies the PC’s config.sys file to use memory
address $D0000 rather than $E0000. This change was
necessary to support the new PC Motherboard model
(described in the previous section). Note that this new
address also works with all previous AXXESSORY
Talk PC Motherboards.
FIGURE 6. SAMPLE BACK OF ASSEMBLED AXXESSORY TALK PC
SAMPLE CARD SLOT
ARRANGEMENT
NOTE: Depending on the model of PC being used, the sample card slot arrangement and connector
locations shown above could vary somewhat.
KEYBOARD
CONNECTOR
AUDIO INTERFACE
CARD
2ND VPC
1ST VPC
POWER CABLE
CONNECTOR
PARALLEL
PRINTER
(FEMALE)
OPTIONAL
FAX CARD
3RD VPC
MONITOR
CARD
TO OPC
(PCM PORT)
TO CPU
(PCM PORT)
TO RS-232-C
(COM1)
TO PC
(COM2, MALE)