JB
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Posts posted by JB
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19 hours ago, jedimatt42 said:I was under the impression vt100 was not the defacto terminal type used on CPM systems. Thus there are pages like this out there :
http://canal.chez.com/CPM/ws3.htm
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"VT100 up to 5 colors"?
That's a bit impressive, given theVT100's a B/W teminal.
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33 minutes ago, apersson850 said:It depends on how you want to define it. Usually, one phase of a four-phase clock is used to trig a certain part of the design, so that four different sections in the CPU do their part of the work in the correct order, within one main clock cycle.
But if you look at each phase by itself, the frequency is still only 3 MHz, albeit with a duty cycle that's not 50%.
What's definitely true is that the 9995 will accomplish more in the same time than a 9900 can do.
Yeah, I do acknowledge that adding the clocks up would be a, umm, questionable thing to do. But you COULD do it!
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11 hours ago, vol said:Maybe it is more correct to regard that the [email protected] is actually working at 12 MHz too? This is also Stuart's point.
Given it requires four different 3-MHz clock inputs, there's an argument to be made there.
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1 hour ago, vol said:We still don't have the proof for it.
The datasheet is clear that there's a 1/4 divider in the chip.
Granted, it does not explicitly say "and the processor runs at the divided clockerate", but they didn't include the divider for no reason(transistors cost money).
Empirical evidence shows that, with a 12 MHz input clock, the 9995 performs slightly better than a 9900 with a 3 MHz clock input, which is what is expected for a slightly improved 9900 running at 12/4 MHz. It is also what is expected for a much much worse version of the 9900 running at 12/1 MHz, but it is difficult to imagine how iterative updates could result in a 4x loss of performance.
I would say the onus is on you to prove the processor ISN'T clocked off of that divider, and it truly was included for no reason. And I look forward to your groundbreaking research in that regard.
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They take different clock inputs, but both run at the same internal frequency.
It is like a 486 DX2, only in reverse. A 486 DX2 66 takes a 33 MHz clock input and doubles it internally, but no one will argue it isn't a 66 MHz chip.
Similarly, the 9995 takes a 12 MHz input and divides it by four internally. We can only speculate as to why, but it clearly doesn't "run at" 12 MHz.
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On 4/18/2021 at 4:32 PM, Elia Spallanzani fdt said:Illegus looks nice as heck. I know there's other obstacles on the 99, but it is like Tunnels of Doom if Tunnels of Doom wasn't hella choppy.
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2 hours ago, Stuart said:Unfortunately those terms will be meaningless to many users ... ;-(
Then rephrase it.
"Is your TV a flickery mess? If yes, press P. If no, press N."
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That you can't fight the zygonaut is the game's greatest flaw.
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They still make real printers. Heck, they still make 9-pin tractor-feed printers with RS-232 and parallel ports.
https://epson.com/For-Work/Printers/Impact/LX-350-Impact-Printer/p/C11CC24001
Case in point, though it took a little scraping to find the ports list.
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SCART is... complicated. It can do several different things.
I've heard that not all displays with SCART inputs will accept RGB. I've never owned a display with SCART inputs myself, though.
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20 hours ago, AtariNostalgia said:Was that the case in the 80s? How did they know which machines to strip? What I'm getting at is that I think most of the TMS9900's from China are clones.
I don't have much experience from aliexpress only ebay. Can someone recommend a seller from Ali so I can get a couple of TMS9900 that I need?
I believe even in the 80s they were harvesting gold from electronics. Dunno how bad the fake IC market was then.
But there's a lot of stuff that wasn't retired until much later, or was retired to a storage room and forgotten for a decade or two. Heck, there's probably STILL some businesses with an old 990 whirring away on some business-critical piece of COBOL.
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13 hours ago, AtariNostalgia said:Does anyone know how so many TI chips ended up in China? There wasn't a market for the TI99 in the 80's there, and surely they're not buying damaged ones from ebay just for the chips. It's quiet puzzling.
Probably because everyone ships their electronics over there for recycling. If it doesn't wind up in a landfill close to home, it goes to China to be recycled. They strip the metal from the PCBs, strip the ICs for resale, then the unsellable parts go in a landfill far from home.
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17 hours ago, JanNordstrom said:And on a more specific note, does anyove know if there is a CMOS battery to be aware of?
No battery in the system or most possible add-ons.
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There's something incredibly ironic about the "quality improved" units all having a potentially board-fatal printing error on them.
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You're not wrong. I remain amazed that for all it's vaunted audiovisual capabilities, the C64 provides no way to USE them other than PEEK'n'POKE, and people to this day think there's nothing wrong with that
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1 hour ago, FarmerPotato said:I haven't done any hardware testing in a month (In fact I had been hospitalized one day.)
Glad you're doing better now!
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On 2/10/2021 at 10:34 AM, HOME AUTOMATION said:Yes, 5 1/4" Floppy drives, were a nearly essential component in most plans for world domination in the mid '80s.
...Today's expanded memory, makes it practical to keep tactical engagement and self-destruct routines loaded at all times.
HA.
We are Borg. Resistance is futile. You will be assimilated. Insert disk two to commence assimilation.
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3 hours ago, retroclouds said:I think I saw one on Ebay recently. Thought how cool is that, a dongle for the TI-99/4a. Do you know how it works?
I don't know, but I really hope the GROM just has "OKAY" in ASCII.
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9 hours ago, GDMike said:I'm already using the Chrome-based Edge. It is a sad thing, and I really hate how Trident Edge went out.
But one of the things I use Edge for is keeping Google away from my normal browsing, and the YouTube diffrence was quite stark by the time Google was done "optimizing".
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6 hours ago, GDMike said:Ive always used netscape..uh, I mean firefox.. always
I use Seamonkey as my primary browser, Edge is a secondary for some specific purposes.
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It is most likely a power-saving optimization in the last Edge update.
I've noticed something similar on YouTube recently(if a video's been playing, but not visible, it stops rendering the video portion entirely until I click on it).
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1 hour ago, Ed in SoDak said:A SCSI card should handle a scuzzy CD drive, right? Same for IDE. Anxiously awaiting further developments in this direction!
That's what I was about to say.
Even if it can't, you can still load data off a CD or DVD. The cassette port cares not where the audio came from.
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That's a real tower of power there.
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On 1/17/2021 at 1:16 PM, Ksarul said:Back then, TI built most equipment to MIL SPEC. One of the tests it had to survive was a drop test. . .rumor back then was 3 feet (1 meter), but the test documentation I've seen said one foot.
I'd be afraid to drop a P-Box three feet.
Not that I might damage the P-Box, mind you. It'll be fine. I'm worried about whatever it lands on.
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TMS-9900 CP/M?
in TI-99/4A Computers
Posted
It seems more like the Linux community started using "vt100" to mean "terminal emulator" and forgot it referred to a specific piece of hardware at some point. So the DEC VT220 color codes are now part of the Linux vt100 software platform.