Foil # REV Comp Date Stamp Date
Backplane 1 * • 09830-66501 REV B - APR 09 1973 -
External I/O Bus 2 * • 09830-66502 REV C 7305 APR 13 1973 09830-66502 REV C 7523 -
ROM Cartridge Bus 3 * • 09830-66503 REV B 7312 APR 16 1973 09830-66503 REV C 7528 -
CPU I/O 11 np - - * • 09810-66511 REV B 7540 -
CPU Clock & I/O 12 np - - * • 09810-66512 REV C 7528 -
CPU Microcode Engine 13 np - - * • 09810-66513 REV A 7536 -
CPU Registers & ALU 14 np - - * • 09810-66514 REV A 7539 -
BASIC ROM 21 np - - * • 9830-66521 REV A 7406 -
M Register 82 np - - * • 09830-66582 REV B 7419 -
T Register 83 np - - * • 09830-66583 REV A 7313 JUN 05 1973
4KW RAM 84 np - - • 5020-8304 REV A 7419 -
" 84 np - - * • 5020-8304 REV A 7325 MAY 24 1973
ROM Buffer 25 * • 09830-66525 REV A 7312 MAR 30 1973 09830-66525 REV B 7536 -
ROM Card 26 np - - * • 5020-6884 REV A 7532 -
Keyboard Matrix 31 * 09830-66531 REV B - - • 09830-66531 REV B - -
Keyboard Encoder 32 * • 09830-66532 REV D 7649 - 09830-66532 REV D 7537 -
Keyboard Interconnect 34 * • 09830-26534 REV B - - 09830-26534 REV B - -
Display 41 * • 09830-66541 REV D 7452 - 09830-69541 REV E 7511 -
Display Logic 42 * • 09830-66542 REV A 7308 MAR 30 1973 np - -
Power Supply 51 09830-66551 REV A 7308 - * • 09830-66551 REV A 7526 -
Tape Interface 61 *M • 09830-66561 - 7307 APR 17 1973 09830-66561 7531 -
Tape Control 62 *M • 09865-66562 REV B 7309 MAR 24 1973 np - -
Tape R/W 63 *M • 09865-66563 REV C 7313 APR 11 1973 09865-66563 REV D 7408 DEC 12 1973
Tape Motor Control 64 *M • 09865-66564 REV B 7311 APR 24 1973 np - -
Tape Interconnect 65 * • 09830-66565 REV B 7405 JAN 17 1974 np - -
Tape Head Amp 66 * • 09865-66566 REV B 7349 - np - -
NOTES
• Printed circuit boards are identified by the Assembly Number printed in the foil
of the circuit board. The last two digits of the assembly number distinguish
each board type, and correspond to the color coding of the board extraction
handles.
• This schematic presents the 4KW RAM board-set so the assemblies are
identified as 82,83,84. The connectors they plug into remain identified as
N22,N23,N24, from the original design for 2KW RAM boards.
• IC locations are identified by a label of the form:
U
<assembly-type>
–
<enumeration>
or
U <assembly-type> – <row-alpha> <column-number>
A few boards have the IC locations in the foil, these are used for the
enumeration if present. For the CPU and tape drive boards the same
enumeration as presented in the HP patent and service manual is used.
For other boards, a row-column locator is used, with the row specified by
a,b,c,.. and the column by 1,2,3,.. starting at the upper left corner.
• The symbol represents a connector pin. The solid black end is the male
side, the white-filled end is the female side.
Connector pins are identified by a label of the form:
N <assembly-type>
. <pin>
• A small black rectangular marker on the upper half of a gate symbol indicates
an open-collector output.
• Capacitance in microfarads unless otherwise noted.
• This schematic is based on a reverse engineering of the 9830 board
assemblies listed in the accompanying table, along with some use of the
9830 patent (US #4,012,725) and the tape drive schematics available in the
the 9830 service manual.
• 2013 Spring - 2014 Spring: Drawn by bhilpert.
2014 Oct 02: typo correction nMW75-->nMW15, pg M8.
2014 Oct 12: corrections to 9866 connector pin labels, pg F2.
2014 Dec 26: correction, U42-c2.2 to V+5 rather than GND, pg D1.
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