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TI-99 Photos Thread! Post your systems here!


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#1076 peterfleeman OFFLINE  

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Posted Thu Jun 21, 2018 9:24 AM

Schmitzi has the European market on PEBs cornered!  I see a dozen of them in those pictures.  :)

 

The most PEBs i've had at one time is 12.  My wife is very glad that i'm down to 2 now.  (Although I have my eye on one on eBay right now...)

 

Chloe PEB Tower


#1077 Schmitzi OFFLINE  

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Posted Thu Jun 21, 2018 12:29 PM

The last picture shows a wall from IKEA, right? I've got the same one (5x5).

 

yes, they are great. I have them in all shapes



#1078 iKarith OFFLINE  

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Posted Thu Jun 21, 2018 5:47 PM

Schmitzi, you have too many PEBs.  You need to send a few of them to other people.  :D



#1079 arcadeshopper OFFLINE  

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Posted Sun Jun 24, 2018 1:40 AM

I got some rf modulators in the mail today4261c89e685b816a7743c84242746dac.jpg

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#1080 ti99iuc OFFLINE  

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Posted Mon Jun 25, 2018 9:45 AM

- on 03 May 2018 - 09:14 AM, said:

I think we're accepting it. Congrats! You worked really hard.

 
Attached File  TI994.jpg   58.74KB   3 downloads

Here is the new TI-99/4. This is an award from Tursi for the Highscore contest in april/may 2018

I am very happy and want to say - Thank you -  for this lovely computer's piece.

 
HERE the complete gallery i published.

Really thanks Tursi.


Edited by ti99iuc, Mon Jun 25, 2018 9:47 AM.


#1081 chue OFFLINE  

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Posted Mon Jun 25, 2018 10:56 AM

Very nice Ciro!  Did you fix the RAM in it? I thought that I read somewhere that the RAM was bad.



#1082 ti99iuc OFFLINE  

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Posted Mon Jun 25, 2018 11:14 AM

Thanks Chue, no it seems to works perfect. probably already been fixed :)



#1083 Tursi ONLINE  

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Posted Mon Jun 25, 2018 4:12 PM

Very nice Ciro!  Did you fix the RAM in it? I thought that I read somewhere that the RAM was bad.


Matt Hagerty replaced the RAM for me before I shipped it. :)

#1084 --- Ω --- OFFLINE  

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Posted Mon Jun 25, 2018 4:25 PM

This photo has me wondering... is it possible to make a TI-99/4A RAID ARRAY? (I know, I know, who would want or need to do that)... well this is a hobby it does not have to be practical!  Imagine 4 TI's  making a tower, with a counter top across each tower.  Of course each P-Box better have the whisper fan modification, or the user would need aircraft grade ear protection for those eight fans!  ;)

 

gallery_47609_2208_379109.jpg

 

Hey, if you have that many P-Boxes, might as well use 'em!



#1085 chue OFFLINE  

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Posted Mon Jun 25, 2018 4:29 PM

Matt Hagerty replaced the RAM for me before I shipped it. :)

 

That explains it!



#1086 Tursi ONLINE  

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Posted Tue Jun 26, 2018 2:01 AM

This photo has me wondering... is it possible to make a TI-99/4A RAID ARRAY? (I know, I know, who would want or need to do that)... well this is a hobby it does not have to be practical!  Imagine 4 TI's  making a tower, with a counter top across each tower.  Of course each P-Box better have the whisper fan modification, or the user would need aircraft grade ear protection for those eight fans!  ;)


Musing because I'm putting off sleep... all things are technically possible. Just a question of effort! ;)

I'm not sure that a RAID based on TI Disk Controllers, at least, would have very much advantage. If you assumed simple striping (where a file is written across all disks at once), you sadly would not be able to recognize many gains with a stock-ish system (such as just re-writing the DSR). This is because the TI CPU is responsible both for seeking the head and reading out sectors in software. So you couldn't really parallelize it - during sector transfer the CPU is pretty close to max'd out (I did some experiments to see how much I could get away with at the same time, and the answer was "almost nothing", it came down to just a few instructions per loop.) So you'd have to seek one drive, read one sector, seek the next drive, read one sector, etc. Odds are that the extra time needed to seek multiple drives would actually make it slower than a single drive. (But, you could gain the increased storage capacity.)

Of course, you could add a microcontroller to each disk controller to manage the seeking and sector reads for you, and thus have the data ready to go when the CPU got to that drive. That would probably offer some advantage in performance. But it's pretty blue sky. ;)

#1087 Schmitzi OFFLINE  

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Posted Tue Jun 26, 2018 11:22 PM

This photo has me wondering... is it possible to make a TI-99/4A RAID ARRAY? (I know, I know, who would want or need to do that)... well this is a hobby it does not have to be practical!  Imagine 4 TI's  making a tower, with a counter top across each tower.  Of course each P-Box better have the whisper fan modification, or the user would need aircraft grade ear protection for those eight fans!  ;)

 

 

 

Hey, if you have that many P-Boxes, might as well use 'em!

 

 

Musing because I'm putting off sleep... all things are technically possible. Just a question of effort! ;)

I'm not sure that a RAID based on TI Disk Controllers, at least, would have very much advantage. If you assumed simple striping (where a file is written across all disks at once), you sadly would not be able to recognize many gains with a stock-ish system (such as just re-writing the DSR). This is because the TI CPU is responsible both for seeking the head and reading out sectors in software. So you couldn't really parallelize it - during sector transfer the CPU is pretty close to max'd out (I did some experiments to see how much I could get away with at the same time, and the answer was "almost nothing", it came down to just a few instructions per loop.) So you'd have to seek one drive, read one sector, seek the next drive, read one sector, etc. Odds are that the extra time needed to seek multiple drives would actually make it slower than a single drive. (But, you could gain the increased storage capacity.)

Of course, you could add a microcontroller to each disk controller to manage the seeking and sector reads for you, and thus have the data ready to go when the CPU got to that drive. That would probably offer some advantage in performance. But it's pretty blue sky. ;)

.

.

oh yes, a "Raid Array" over the disk drives would be hard to do...

and there is no real practical gain, as you say, isn´t it ?

 

But we talked about "chaining PEBs via FlexInterface-Cards" before, IIRC.....

So you could get some more PEB-slots for more cards, and some more space for mounting more disk drives :)

 

Wouldn´t it be nice, if you "really" want to switch OFF your (i.e.) RAMdisk, your SCSI-subsystem, or your PCode ?

You just would have to power OFF one of your PEBs ? ;) Does that work ?

 

But this is restricted by the CRU addresses, right ? And by the interoperability of cards...

So what could be the maximum of cards / CRU addresses / "subsystems" by chaining PEBs ?

I think of the total maximum that makes any sense. And maybe former restrictions can be broken

yes, the fan(s), of course ;)

xXx



#1088 --- Ω --- OFFLINE  

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Posted Wed Jun 27, 2018 11:57 AM

Working on a video today, got it assembled and took a couple of still shots...

 

"CLOSEUP" VIEW

gallery_35324_1027_137355.jpg

 

 

"FULL" VIEW

gallery_35324_1027_37922.jpg



#1089 Tursi ONLINE  

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Posted Wed Jun 27, 2018 2:12 PM

So what could be the maximum of cards / CRU addresses / "subsystems" by chaining PEBs ?


For new hardware, you could invent new schemes, but for traditional cards each card needs to grab a dedicated CRU address at >1x00.. technically that imposes a limit of 16 cards maximum (0-F). That addressing is a convention for the system, not so much a physical or electrical restriction. There's actually a lot of unused CRU space. ;)

#1090 arcadeshopper OFFLINE  

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Posted Wed Jun 27, 2018 10:27 PM

Full..d3790a0268820b6bc0e233f0978490b8.jpg

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#1091 digdugnate OFFLINE  

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Posted Thu Jun 28, 2018 6:34 AM

Full..d3790a0268820b6bc0e233f0978490b8.jpg

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is that a TIPi PEB card i spy?



#1092 arcadeshopper OFFLINE  

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Posted Thu Jun 28, 2018 10:45 AM

Yep!

is that a TIPi PEB card i spy?


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