Service manual

H/Z-100 Service Bulletins
-- Locate U22-38. Change "ORG" to DRQ."
-- To make the schematic agree with the printed circuit board, change the schematic
jumper numbers as follows:
FROM TO Schematic
(Schematic): (Circuit Bd): Location:
J1 - J8 J3 - J10 Interrupt Jumpers
J9 J1 Near U19 (RDY delay)
J10 J2 Near U11-1 on 8"/5" line
- On page 7.12 and 12.34 of the Z-100 Interim Service Manual, add the following
commands to the Command Summary charts appearing on these pages.
Command Code (Hex)
Enable Interrupts 0C
Disable Interrupts 0D
FSB-Z100-027: System Crashes When Winchester Is Installed
This may be caused by the HE 444-151 (U28) and HE 444-152-2 (U29) PALs on the
Winchester controller board. Under certain circumstances, these PALs may cause a
glitch on pin 19 (CDSB*) of the S-100 bus, causing memory failure.
To correct this condition, replace the HE 444-151 and HE 444-152-2 PALs with HE
444-151-1 and HE 444-152-3 PALs respectively. Replace both parts together, as
they are a set. Replace these parts on all units.
FSB-Z100-028: Z-205 Manual Correction
Superseded by FSB-Z100-036.
FSB-Z100-029: Z-100 Schematic Corrections
Please make the following changes to your Z-100 Interim Service Manual (HE 860-
15) schematics:
- Schematic MB3: At U126 (upper left corner of the schematic), change "TRI-STATE
OCTAL LATCH" to "TRI-STATE OCTAL BUFFER."
- Schematic VB1: The two NOR gates at U379 in the CRTC/CPU arbitration logic
(lower left corner of the schematic) are marked with two part numbers: HE 443-
http://home.earthlink.net/~z100lifeline/data/Service.html (9 of 21)7/4/2004 1:41:55 PM