** Looking for the manual for this CPU board.**
I found an ad in Byte from 1981
View attachment Byte 1981-02-OCR-Page-0149.pdfshowing the cost of $349. It sure would be nice to find
a manual, but I am hatching a plan to trace the i/o port logic to find
out where all the on board devices are addressed. I have also started a
parts list and jumper config list... maybe some traffic about this board
will help jog someones memory about a manual!. This board seems to be a
great option for the core of a 4Mhz z80 system. Its too bad it doesnt
even have one blinking LED. I really like seeing leds on things like
serial activity, watchdogs, power OK.
Working on this stuff is much more fun than jig saw puzzles... maybe I
will have it figured out by the end of our current lock down.
cheers
Lawrence
MZ80A-I/O CPU ASSY NO 11-1019 REV B
u1 mc1488/75188n
u2 mc1489p/ds1489n
u3 mc1488/75188n
u4 mc1489p/ds1489n
u5 7404
u6 sn74s74n
u7 com8116 Standard Micro Systems dual baud rate generator
u8 24 pin zif eprom socket for 2708/2716/2732
u9 z80a dart dual uart
u10 am8255apc parallel port
u11 sn74ls04n
u12 sn74ls74an
u13 74ls266b1
u14 sn74ls74an
u15 sn74ls00n
u16 74ls09b1
u17 z80a ctc counter timer chip
u18 z80a ctc counter timer chip
u19 z80a cpu (z8400a ps)
u20 74ls32b1
u21 74ls09b1
u22 75ls02n
u23 74ls32b1
u24 74ls09b1
u25 74ls02n
u26 74ls244n
u27 dm74ls125an
u28 dm74ls125an
u29 dm8160n Magnitude Comparator, 8160 Series, 6-Bit
u30 sn74ls244n
u31 sn74ls244n
u32 sn74ls244n
u33 sn74ls244n
u34 sn74ls244n
u35 sn74ls244n
u36 sn74ls240n
u37 sn74ls138n
u38 sn74ls123n
q1 2n4403
vr1 lm323k 5 volt regulator
vr2 l7912cv -12v regulator
vr3 7812c +12v regulator
vr4 79l06a -6v regulator
y1 8Mhz xtal
y2 5.0688Mhz? xtal for baud rate generator 50-19200baud available in 16 steps
2 baud clocks are at 16x the baud rate set by rotary hex switches SWA SWB
J2 26 pin ribbon connecter - serial port
J3 50 pin ribbon connector - parallel port
J4 26 pin ribobn connector - serial port
J5 ??
Configuration jumpers
E1 2x9 eprom selection
E2 1x3
E3 4x1
E4 1x6
E5 1x6
E6 2x4
E7 2x6
E8 2x2
E10 1x2 not populated
E11 1x2 not populated
E12 1x2 not populated
Default config jumpers - viewed with i/o connectors at the top and
S100 bus at the bottom, voltage regulators on the left.
E1
o o o o o o o o o
| | | |
o o o o o o o o o configured for 2708 eprom
E2
o-o o
E3
o o o o
E4
o-o o o-o o
E5
o
|
o
o
|
o
o
o
E6
o-o
o-o
o o
o-o
E7
o o o o o o
| | | | |
o o o o o o
E8
o o
| |
o o
SWA hex rotary switch - serial baud rate selection E=9600 baud
SWB hex rotary switch - serial baud rate selection E=9600 baud