Service manual

H/Z-100 Service Bulletins
FSB-Z100-035: Z-205 Configuration Help
In order to help clear up some misunderstandings about the Z-205, the following
information will aid in setting up the proper configuration for any Z-100 use. (FSB-
S100-001 attempted further clarification and is incorporated in this discussion - ed.)
Later Z-205 boards used a different style DIP switch that caused additional
confusion when configuring this card. Early manuals showed drawings of the earlier
style DIP switches showing a "0" position, while the new DIP switches showed an
"ON" (shorted) in this position. Looking at the component side of the Z-205 card,
with the 100 pin connector at the bottom, the right side of the switches are "ON"
and are shorted. For the discussion below, a "1" represents an open section.
The Main Board on the Z-100 must be fully populated with 192K RAM in order for
any unmodified Z-205 card to function. The RAM located on the Main Board are
Banks 0, 1, and 2.
The FIRST Z-205 card added becomes RAM Banks 3, 4, 5, and 6. SW1 is set to the
address of 98h and since the first Bank on the card is 3, then SW2 is set to 03h (The
suffix h stands for Hex). The settings are:
1st Z-205: SW2 SW1
0 *-- 0 --*
SW2 = 03h 1 *-- 1 --*
SW1 = 98h 2 --* 2 --*
3 --* 3 *--
4 --* 4 *--
5 --* 5 --*
6 --* 6 --*
7 --* 7 *--
OFF /ON OFF /ON
Note: Position 0 on each switch is the LSB, therefore for SW1 to be 98h:
Hex 9 8
Binary 1001 1000
SW1 positions: 7654 3210
The second Z-205 card installed has an address of 99h, having RAM Banks 7, 8, 9,
and A. Since the first bank on the card is 7, then SW2 is set to 07h.
2nd Z-205: SW2 SW1
0 *-- 0 *--
SW2 = 07h 1 *-- 1 --*
SW1 = 99h 2 *-- 2 --*
3 --* 3 *--
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