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Skinner Electronic Enterprises * 
PO Box 787 — 

Fallbrook, CA 92028 

Check/MO S/H $2.25/ea or 3/$5.00 


Item # 1552 
PERSONAL FINANCES PART I 
ZX-81 16K RAM (cas) 
Financial 
"Compound Interest Calculations" 
Calculates the total amount of in 
terest produced by an investment, 
. the time required to yeild a giv- 
en amount, the rate of return on 
an investment, the investment re- 
quired to produce a specific 
amount in the future, the future 
value of today's investment, the 
value of a deposit when the in- 
terest is compounded daily, the 
effective annual rate when the 
annual rate is compounded, & the 
true APR of an Add-on charge. 


$12.95 


Item # 1553 
PERSONAL FINANCES PART II 
7X-81 16K RAM (cas) $12.95 
Financial 
"IRA & Simple Interest Calcula- 
tion" Calculations to compute the 
annual balance for an IRA account 
when a single deposit is made an- 
nually, or when a regular monthly 
deposit is made, or when irregu- 
lar monthly deposits are made, to 
determine the total amount of 
Simple Interest due or paid, how 
Tong it will take for simple 
interest to increase a sum to a 
given amount, to find the rate of 
return on an investment, how much 
must be invested to produce a 
given amount, to find the value 
of an investment after a given 
period of time. 


Item # 1554 
PERSONAL FINANCES PART III 
ZX-81 16K RAM (cas) 
Financial 
"Loan Amortization Calculations" 
Calculations to determine the 
number of payments to be made, 
annual interest rate being paid, 
payment amount required, how much 
can be borrowed for a given pay- 
ment, how much interest has been 
paid, what is the remanining bal- 
ance, how much will be refunded 
on early payoff, an amortization 
table printed in 32 column double 
line format. 


$12.95 


kak kk 


KEAEKEKKEK USER NOTES REKRRKAARAEKK 


Always remember to make back- 
up copies of all your data 
tapes to insure that the data 
is not lost in a bad SAVE or 
* with a damaged tape. 


RRA RREEEEARREAAA AIK 


+ + 
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Circle Chess 

PO Box 63 

Des Plaines, IL 60017 
Check/MO S/H $ 


| Item # 1555 a 
CIRCLE CHESS j 
ZX-81 16K RAM (cas) / $ 
TS-2068 (cas) $ 
Game 
A special and unique form of the 
chess game, The playing board is 
made up of 3 different kinds of 
spaces: 9 hexagons, 30 triangles, 
& 38 rectangles for a total of 77 
spaces. The paths used are: a 
straight line and a circle. The 
game is complete on tape, but is 
also available in box form separ- 
ately (extra) for playing when 
you are not at your computer. 

KKK 


Group Technology, Ltd. 

PO Box 87 

Check, VA 24072 

Check/MO Visa/MC S/H $2.00 UPS 


Item # 1556 
FDZX1 Interface Board 
assembled & tested $99.95 
kit $69.95 
Interface 
Enables the Sinclair Spectrum, 
ZX-81, TS-1000, TS-1500 & TS-2068 
to be used in automated measure- 
ment, data acquisition & instru- 
ment control applications. Fully 
buffered address, data and con- 
trol buses for input/output in- 
terfacing plus 6 decoded device 
codes (expandableto 18) for con- 


venient access. 
kKkkhk 


Clifford & Associates 
13910 Halldale Avenue 
Gardena, CA 90249 
Check/MO S/H 


Item # 1557 
Z-LINK Interface Card 
TS-2068 Emulator l 
Interface 
With this interface you are able 
to use the Sinclair Interface-1 
with built-in RS-232 & L.A.N. and 


$49.95 


operate up to 8 ZX-Microdrives. 


Also run the Rotronics Wafadrives 
Run most Spectrum peripherals and 
hardware. Depending on the "type" 
of peripheral you wish to RUN de- 
termines the type of Emulator or 
firmware you will be required to 
run on your TS-2068. Write for 
details on what is compatible 
with what peripheral you intend 


to use. 
khkkk 





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A & J Micro Drive 

1050 "I" East Duane Avenue 
Sunnyvale, CA 94086 

(408) 732-9292 


H software & wafers $3.00 
H starter kit & drive $6.50 
anada $10.00. Normally ship UPS. 


Sai srt Visa/MC COD (add $1.65) 
S 


Item # 1558 
Stringy Floppy Model 1000 
Starter Kit by A & J Micro Drive 
ZX-81 $169.95 
Interface/Mass storage 
Data transfer (load & save) is 30 
times faster than a cassette with 
no sensitive volume controls, no 
rewinding or buttons to push, up 
to 127 files per tape, compatible 
with other peripherals, pluas in- 
to expansion port, automatic ver- 
ify with save, file directory. 
These are just some of the advan- 
tages you get with the system. 
Seperate power supply, so will 
not drain the ZX-81. Conttnuous 
loop cartridge (Micro Wafer I). 
Store up to 70K bytes on 50 foot 
wafer. Complete with Interface, 
Drive 0, cables, power supply, 
manual, Operating system, 5 Micro 
Wafers (one each length) & Wafer 
Organizer. Plug it together & RUN 


Item # 1559 
Model 1000 Interface 
ZX-81 $79.50 
Interface 
This is the interface only and it 
is included in the starter kit 
above. 


Item # 1560 
Model 1000 Stringy Floppy Drive 0 
ZX-81 & Micro D. Interface $99.50 
Mass storage 
This is the first drive only and 
it is included with the starter 
kit above. 


Item # 1561 
Model 1000 Stringy Floppy Drive 1 
ZX-81, MD I/F & Drive 0 $99.50 
Mass storage 
Want to add more storage power? 
Then this is the drive to order 
to expand your unit. Requires the 
Drive 0 & Interface. 


Item # 1562 
Owner's Manual for Model 1000 
Stringy Floppy by A&J Micro eh 
95 


Book 


This is included in the starter 
kit above. 


155