Service manual

H/Z-100 Service Bulletins
FSB-Z100-039: Schematic Corrections - U130
Please make the following changes to schematic MB3 in your Z-100 Interim Service
Manual.
- Locate U130 in the Refresh Timing and Arbitration circuits (upper center of the
schematic). Change the part number from HE 443-1039 to HE 443-1049.
- Locate U130 in the Refresh, Wait Timing & Error-Generation circuits (upper right of
the schematic). Write "HE 443-1049" below the generic number (ALS37).
FSB-Z100-040: Z-217-1 Winchester Disk Controller Card
IC Change at U41, U45, and U48
Because of the unavailability of parts, the 74ALS273 ICs at U41, U45, and U48 were
changed to 74LS273 ICs. This was not a modification and older boards do not
require this change.
FSB-Z100-041: Z-207 Floppy Disk Controller Board; Precomp Will Not
Adjust
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