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Update on the reTIL project
Fantastic!
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gregory simmons
· #31483
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$1.99 RasPi 'Pico' VGA & PS2 Terminal
I'm looking forward to playing with these. I bought some from SparkFun @ $4 each... our local MicroCenter here in Columbus, Ohio was out-of-stock already, but even at $4 it's a pretty good deal.
I'm looking forward to playing with these. I bought some from SparkFun @ $4 each... our local MicroCenter here in Columbus, Ohio was out-of-stock already, but even at $4 it's a pretty good deal.
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By
gregory simmons
· #31346
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NOP-tester
A little OT, but this reminds me of the HCF (Halt and Catch Fire) instruction on the 6800/6802/6808 processors (hex 9D) which continually incremented the address bus.
A little OT, but this reminds me of the HCF (Halt and Catch Fire) instruction on the 6800/6802/6808 processors (hex 9D) which continually incremented the address bus.
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gregory simmons
· #29047
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low profile IC sockets on Membership Card
Good to know!
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gregory simmons
· #28389
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Pico/Elf V2
Josh's link took me to the Canadian Digikey site. I didn't notice at first that the price was $5.56 in Canadian dollars. The price on digikey.com, in USD, is $3.85. This is exactly what I've been look
Josh's link took me to the Canadian Digikey site. I didn't notice at first that the price was $5.56 in Canadian dollars. The price on digikey.com, in USD, is $3.85. This is exactly what I've been look
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gregory simmons
· #28279
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COSMAC in Japan
If you blow up the picture a little, you see that we have a CHIP-8 program which draws the square. It would be nice to know more about this product.
If you blow up the picture a little, you see that we have a CHIP-8 program which draws the square. It would be nice to know more about this product.
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gregory simmons
· #28199
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Noob question: examine arbitrary memory address?
#memory
#ELF
What amazes me is, when I finally figure out what a problem was, it seems so obvious that I don't understand why I didn't figure it out a lot sooner. This seems to have been a pattern for me for decad
What amazes me is, when I finally figure out what a problem was, it seems so obvious that I don't understand why I didn't figure it out a lot sooner. This seems to have been a pattern for me for decad
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By
gregory simmons
· #28092
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1861 Replacement
If I can jump in here, I think it was July, 1977, page 41: https://worldradiohistory.com/Archive-Poptronics/70s/1977/Poptronics-1977-07.pdf greg AB8IM
If I can jump in here, I think it was July, 1977, page 41: https://worldradiohistory.com/Archive-Poptronics/70s/1977/Poptronics-1977-07.pdf greg AB8IM
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By
gregory simmons
· #28065
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1861 Replacement
Also, a very pretty white and gold Harris 1802 from the same seller, same price. ========================================
Also, a very pretty white and gold Harris 1802 from the same seller, same price. ========================================
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By
gregory simmons
· #28030
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Speech synthesizer construction article using 1801 and SC01
Robert, this is very cool. Fortunately, the SpeakJet chip is currently available from SparkFun for around $25.
Robert, this is very cool. Fortunately, the SpeakJet chip is currently available from SparkFun for around $25.
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By
gregory simmons
· #27846
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RCA VIP
Ray, that was very generous of you! There's no doubt they were worth far more than you sold them for.
Ray, that was very generous of you! There's no doubt they were worth far more than you sold them for.
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By
gregory simmons
· #27818
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16 bit Subtraction
OS programming vs user programming: Mike, I agree with you, if, as a user, your code is bumping up against the size limitations of a data type. On the other hand, when you're writing an OS, I think yo
OS programming vs user programming: Mike, I agree with you, if, as a user, your code is bumping up against the size limitations of a data type. On the other hand, when you're writing an OS, I think yo
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gregory simmons
· #27534
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16 bit Subtraction
My Dad worked with a computer which used a sign bit for integers. This led to two representations for zero: a positive zero and a negative zero. He left it as a puzzle for me, how to tell the differen
My Dad worked with a computer which used a sign bit for integers. This led to two representations for zero: a positive zero and a negative zero. He left it as a puzzle for me, how to tell the differen
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gregory simmons
· #27528
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16 bit Subtraction
Mike, that's what I'm used to as well, but it can cause complications; for example, it breaks the absolute value function, since the negative value exists, but the positive does not. I think if I were
Mike, that's what I'm used to as well, but it can cause complications; for example, it breaks the absolute value function, since the negative value exists, but the positive does not. I think if I were
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By
gregory simmons
· #27525
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16 bit Subtraction
Oops, David Madole had already explained this, and more concisely too. My bad. greg AB8IM ================
Oops, David Madole had already explained this, and more concisely too. My bad. greg AB8IM ================
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By
gregory simmons
· #27504
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16 bit Subtraction
Craig, you might want to research "two's complement". When you subtract hex 10 from hex 05, it is decimal 16 subtracted from decimal 5 which is decimal -11 which would be -0B, not -0A. The answer woul
Craig, you might want to research "two's complement". When you subtract hex 10 from hex 05, it is decimal 16 subtracted from decimal 5 which is decimal -11 which would be -0B, not -0A. The answer woul
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By
gregory simmons
· #27503
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16 bit Subtraction
Lee, 3's complement is a new one for me.
Lee, 3's complement is a new one for me.
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By
gregory simmons
· #27494
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UT3 and UT62 Source Code
Hello Todd, Thank you very much, I appreciate your kind offer. I really don't like asking other people to clean up my errors... this is the first time I've keyed in a source file that I wasn't able to
Hello Todd, Thank you very much, I appreciate your kind offer. I really don't like asking other people to clean up my errors... this is the first time I've keyed in a source file that I wasn't able to
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By
gregory simmons
· #27464
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UT3 and UT62 Source Code
Herb, Comparing the object code in Ed's UT-62 RCA listing to your "ut62_herb.hex" file, the files are very similar, but do appear to be to be 5 differences, as shown below: Hex address, RCA code, your
Herb, Comparing the object code in Ed's UT-62 RCA listing to your "ut62_herb.hex" file, the files are very similar, but do appear to be to be 5 differences, as shown below: Hex address, RCA code, your
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By
gregory simmons
· #27462
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UT3 and UT62 Source Code
ED, I can't speak to the interest part, but as far as your UT62 scans, they were awesome, perfectly readable. I'm about 55% finished typing out (transcribing) the UT62 source code, should be done by t
ED, I can't speak to the interest part, but as far as your UT62 scans, they were awesome, perfectly readable. I'm about 55% finished typing out (transcribing) the UT62 source code, should be done by t
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By
gregory simmons
· #27453
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