#oldcomputers — Public Fediverse posts

#ibm1620 #oldcomputers #retrocomputing

The multiply cycle of the IBM1620 is less nuanced than the add/subtract/compare cycles.

It's got this poorly-described "first cycle" flip-flop (a/k/a "latch" or "trigger"). The docs provide some hints about states, but are vague on the details.

Also. There's a "units position of the multiplicand" condition. Which isn't defined.

Turns out "first cycle" **is** "units position of the multiplicand".

Consistent terminology? The struggle is real.

#ibm1620 #oldcomputers #retrocomputing

The multiply cycle of the IBM1620 is less nuanced than the add/subtract/compare cycles.

It's got this poorly-described "first cycle" flip-flop (a/k/a "latch" or "trigger"). The docs provide some hints about states, but are vague on the details.

Also. There's a "units position of the multiplicand" condition. Which isn't defined.

Turns out "first cycle" **is** "units position of the multiplicand".

Consistent terminology? The struggle is real.

#ibm1620 #oldcomputers #retrocomputing

The multiply cycle of the IBM1620 is less nuanced than the add/subtract/compare cycles.

It's got this poorly-described "first cycle" flip-flop (a/k/a "latch" or "trigger"). The docs provide some hints about states, but are vague on the details.

Also. There's a "units position of the multiplicand" condition. Which isn't defined.

Turns out "first cycle" **is** "units position of the multiplicand".

Consistent terminology? The struggle is real.

#ibm1620 #oldcomputers #retrocomputing

The multiply cycle of the IBM1620 is less nuanced than the add/subtract/compare cycles.

It's got this poorly-described "first cycle" flip-flop (a/k/a "latch" or "trigger"). The docs provide some hints about states, but are vague on the details.

Also. There's a "units position of the multiplicand" condition. Which isn't defined.

Turns out "first cycle" **is** "units position of the multiplicand".

Consistent terminology? The struggle is real.

#ibm1620 #oldcomputers #retrocomputing

The multiply cycle of the IBM1620 is less nuanced than the add/subtract/compare cycles.

It's got this poorly-described "first cycle" flip-flop (a/k/a "latch" or "trigger"). The docs provide some hints about states, but are vague on the details.

Also. There's a "units position of the multiplicand" condition. Which isn't defined.

Turns out "first cycle" **is** "units position of the multiplicand".

Consistent terminology? The struggle is real.