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Calculators: Handheld: Electronic Resources Memory Master M
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Size (actual): |
75mm
x 153mm x 19mm (max) (w,h,d) |
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Power: |
4.5V DC using 3 x AA size batteries. It accepts an adaptor/charger (3.3-4.65V 200mW) through a socket on the top side to the far left. (I found 3V centre positive worked fine) The on/off switch is on the left hand side just below the name plate. When the batteries are low an "L" is displayed in the far left (ninth) digit - thereby draining the power even quicker! The battery compartment door has a piece of foam stuck to hit to hold the batteries in place. | ||
| Case: | Made from a two-piece matt black plastic case this calculator is quite a slim design. The top area is slightly thicker in order to accommodate the batteries. The top sectional has a metallic sticker printed with black text. The narrow red plastic display filter is flush and only slightly tilted but gives a clear display. The keyboard is surrounded by a brushed aluminium panel with black label keys. The concave keys are short travel, loud click type but work well on my example. | ||
| Display: | 8 digit red flat LED with a ninth digit for negative, low battery, memory and error indicators. |
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| Features: | Standard four functions with percentages and five function memory, reciprocal, square, square root and register exchange | ||
| Age: | c1975 | ||
| Manufacturer: | No maker's name, no serial number, no model number. Made in Hong Kong. The manual is credited to Electronic Resources Ltd, Hong Kong. | ||
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Comments:
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Generic calculator that isn't too bad considering it has been made as cheaply as possible. The logic is let down by quite a few bugs. Original case is black soft plastic with flip over flap and front tuck in section. |
| Components: | |
| Boards: | |
| Construction: | There is a screw underneath the Memory Master plate. To remove this would result in permanent damage - so don't bother. |
| Logic comments: | (C/CE) cancels an incorrect numerical entry, pressing a second time clears the calculator |
| Input overflow is suppressed, keying in a ninth digit is ignored | |
| There is automatic constant on all four functions | |
| Negative numbers are shown by a minus in the immediate left digit travelling into the far left (ninth) digit thereby allowing full eight digit negative numbers. | |
| Divide by zero results in zero and an "C" in the far left (ninth) digit and is recoverable using (C/CE) | |
| Overflow shows the result with "C" (or "E" if negative) in the far left (ninth) digit and is recoverable using (C/CE) | |
| Memory overflow is indicated and recoverable using (C/CE) and it retains the shifted result | |
| Memory store is indicated with top right vertical segment of the far left (ninth) digit | |
| Negative square roots are not allowed: showing zero and "C" in the fare left (ninth) digit which is not recoverable | |
| There is a battery save function: after around 30 seconds the display switches off except for the "-" sign in the fifth digit: recovery is by use of the (C/CE) key | |
| It suffers the negative zero bug: key in (1)(-)(2)(=) to give "-1" then (+)(1)(=) to give "-0" | |
| It suffers the divide to negative zero bug: key in (-)(3)(=) to give "-3" then (/)(1)(0)(=)(=)(=) etc to eventually end up with "-0" | |
| This calculator has the pseudo fixed decimal bug; key in (0)(.)(0)(0)(0)(+)(1)(=) and the answer will be "1.000". This fixed decimal mode remains for addition and subtraction until the result requires more precision. |
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The
basic black and white manual measures 120mm by 67 mm and is 24 pages in
total. Quite a good description and plenty of examples.
Electronic Resources Ltd., Hong Kong. |
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