Monday, January 9, 2017

GI SP0250

Speech Synthesizer
from Milton game

783-4043-002
GI 8033CBA



c 1979 G.I. CORP
90-32034

Unknown processor from VTech Mini Wizard

VTEL27-0693 JAPAN
4270N9211 9514H



V
G288
9211

Motorola MC68881
floating point coprocessor

MC68881
<Motorola logo>c 1984 m<Motorola logo>
A93N

Motorola MC68851
Paged Memory Management Unit

<Motorola logo>c 1985 m <Motorola logo>
MOTOROLA PMMU
MC68851 B36K

Saturday, January 7, 2017

Motorola MC68010
microprocessor

c 1982 m
MC68010 RG2

Motorola MC68HC05

bare chip purchase

<Motorola logo>
c RFT UV 34
1D63F
HLAA9342


MC68HC05L1
HKGICDC D63F
c 1991 <Motorola logo>
m MOT INC.

Texas Instruments TMS1024

I/O Expander
bare chip purchase

<TI logo>
TMS1024NLC
M<delta>71001


TMS1024C

NEC D7220

Graphics Display Controller
bare chip purchase

NEC JAPAN
D7220AD
8903M5


D7220A
c 1983 NEC
HGDC

MOS MCS2523

Commodore MM2SR calculator

MOS
MCS2523
A00207743



2521C
MOS
c
Intersil ICL7107

A/D converter with LED output
bare chip purchase

<Intersil logo>
ICL7107CPLZ
P13388GF4



<unknown logo> GC8618A
171838M2

GC8218C


Friday, January 6, 2017

Allegro A3958

PWM motor driver
bare chip purchase

A3958SB
<Allegro logo> 0022
D022022



3958

Mostek Z80

MOSTEK c 8216
MK3880N-4
Z80-CPU



MK
3880



69-107680-A


69-107680-A
EIA 7939


MC121


NEC D765

floppy disk controller
bare chip purchase

NEC JAPAN
D765BC
9131E7002



NEC D765B
c NEC '82 '87
m NEC

Texas Instruments TMS1100P1072E

unknown functionality (possibly Grundig TV)
bare chip ebay purchase

TMS1100P1072E
2084 QGU
GERMANY 8736



1100G MP1072E

National Semiconductor SM61250 (MM5738)

Novus 850 Calculator

NS 520
SM61250



4738



Pinout

Same pinout as MM5737- my Montgomery Ward P50 uses the same PCB as the Novus 850.
I don't know why it's not labelled MM5738.


Modifying the Novus 850 for additional functions

Thursday, January 5, 2017

National Semiconductor MM5737


NS 514
MM5737N


MM5737



This chip, the MM5777 and the MM5780 are very similar.
National Semiconductor MM5780

Quiz Kid

<National Semiconductor logo>-829
MM5780N



MM4780Z



Pinout
data book with lots of tech info
Patent
This chip, the MM5777 and the MM5737 are very similar.
This chip is basically an MM5737 without the LED segment drivers, but with red and green LED drivers.  The keyboard is connected so that the equals sign is paralleled with the minus sign, and the test button replaces the equals sign.  That way, when you enter an equation like "3+4=7 test", you are actually entering "3+4-7="  If your answer is correct, the result is 0, and the green LED is lit.  Otherwise the red LED is lit.

National Semiconductor MM5777

Novus 750 calculator

glob on printed circuit board

MM4777


Pinout
data book with lots of tech info
This chip, the MM5737 and the MM5780 are very similar.
National Semiconductor 4757

Novus 650 Calculator

glob on printed circuit board

4757

RMR-0012

Sears Auto Race

bare die on unmarked 28-pin header



RMS-0012