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TI-99/2 questions


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#126 FarmerPotato OFFLINE  

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Posted Fri May 4, 2018 11:39 AM

 

We could find more information if somebody goes to the TI Archive library, located here

https://legacy.lib.u.../smu-00063.html

Sometime in the past TI donated the whole archive to a library, occupying over 1500 cubic feet of material.

I got this information when I asked TI support about buying/getting some TI-99 internal documents this year.

 

I might be able to go to the SMU library in Dallas. Thank you for pointing this out!

What sections do you think are most relevant?  I think RG-14 Consumer Products Division.



#127 mizapf OFFLINE  

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Posted Fri May 4, 2018 12:31 PM

By the way, do we have a Wafertape ROM dump?



#128 acadiel OFFLINE  

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Posted Fri May 4, 2018 7:21 PM

Most of the Hexbus peripherals use a 70C20 processor that has its own 2K ROM space where the Hexbus code lived. The processor is marked as a TI special part, not as a TMS70C20 processor. I don’t know if some used the 4K rom 70C40 or not.

We would have to either create a custom jig and desolder it and try to dump it or find some other way.

My early production RS232 actually has an actual 70C20 on a daughter board where the proprietary chip would normally be.


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#129 kl99 OFFLINE  

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Posted Sat May 5, 2018 12:35 AM

 

I might be able to go to the SMU library in Dallas. Thank you for pointing this out!

What sections do you think are most relevant?  I think RG-14 Consumer Products Division.

 

That would be awesome. I could only afford a trip from Europe to the USA when I combine it somehow with the Chicago Faire.

With your guess you are probably correct. Some earlier documents show: "Personal Product Division" but that might have been migrated into the Consumer Products Division. Anybody knows that?

 

What do you guys think, would be find the actual Grom schematics (TMC0430) and Cpu schematics in the Semiconductor Group?

The TI-990 stuff was done by the Digital Systems Group but that is not listed.

 

Personally I would be most interested in Specifications we don't have yet or we don't even know about that they exist and printouts of the commented original source code for the operating system of the TI-99/4, TI-99/4A, TI-99/2, TI-99/4B, TI-99/5, TI-99/7, CC-40, CC-40+. That would give such a deep insight.

But whoever goes there should check for what we wants.

 

I assume you need to know the code names for several products:

Ground Squirrel = TI-99/2

Armadillo = TI-99/8

ALC = Advanced Language Calculator = CC-40, sometimes also they refer to the ALC Interface or Bus, then the Hex-Bus is meant
Product 359 = TI Extended Basic

Home Computer = TI-99/4 (there was only one in the beginning)

Lonestar Console = ??? (also CC-40?)

 

Here is my list of known Specification we are missing:

 

Hex-Bus™ Interface Peripheral Specification (Spec, 1982-10-08)
Hex-Bus™ Peripheral Bus Specification
Hex-Bus™ Printer Software Functional Specification
Hex-Bus™ Wafertape Software Functional Specification
Hex-bus Cable sketches (Spec, 1983-04-11)
Lonestar Console Intelligent Peripheral Bus Software Design Specification
Hex-Bus™ Generic I/O Product Specification
Advanced Language Calculator Product A Functional Specification
Advanced Language Calculator Microtape Peripheral Functional Specification

Disk Peripheral Hardware Specification (also known as 'Home Computer Disk Peripheral Hardware Specification')
Approaches to a Double Density Disk Controller Design for the 99/4X (Spec, 1982-01-11)
99/4 Interface Considerations, DS/SD Disk Controller Electrical Specifications (Spec, 1982-07-13)
Data Sheet for FDC9216 Floppy Disk Data Separation from Standard Microsystems Corporation (1981)
Disk Drive without Power Supply, TI Specification 1040367
NEC uPD765 Single/Double Density Floppy Disk Controller Data Sheet (Spec, 1980-10)
Functional Requirements for a Dual Density 5¼ Floppy Disk Controller Board(Spec, 1982-02-08)
Home Computer Disk Peripheral Product Specification

General Requirements for IC’s, Spec 1500005
TI QRAs 10273 – Product Qualification
TI QRAs 10332
TI QRAs 10348
TI QRAs 10349 – IC Qualification
TI QRAs 16237
FCC part 15, subpart J
FCC Rules and Regulations, Part 15 Sub-parts, A, B, & H and Part 2, Subpart J
FCC Docket 20780
FCC Docket 20780, Part 15, Subparts H and I
National Safe Transit Pre-shipment Test Procedure
CSA STD C22.2-154
MIL STD 105
UL STD 114
MIL STD 810B
MIL STD 461
MIL STD 462
MIL STD 461A; 462 Methods CS01, CS02, CS06, RS01, RS02, RS03
UL STD 461A; 462 Methods CS01, CS02, CS06, RS01, RS02, RS03

Home Computer Basic Language Specification (Spec, 1979-04-12, Revision 4.1) also known as 'TI-99/4 Home Computer Basic Language Specification'
Product 359 Basic Language Specification (Spec, 1980-01-28)
Product 359 Basic Subprogram Specification (Spec, 1980-01-28)
Product 359 Basic Sprite Specification(Spec, 1980-01-28)
Product 359 Basic Interpreter Expansion RAM Peripheral Support Software Specification (Spec, 1980-01-28)
Product 359 Basic Language Implementation and Verification Specification (Spec, 1980-01-28)
Specification of a Texas Instruments Standard for the Basic Language (Spec, 1978-06-09)
TI-99/4A Console Basic Software Specification (Software Spec)

TMC0350 128-K Bit Rom Electrical Specification
Speech Module Spec. 1034759
TMS 5200 (old TMS 0285) Voice Synthesis Processor Data Manual

TI-99/4 ALC Support Package (Spec)

Home Computer Graphics Language Specification
Home Computer Monitor Specification
System Monitor Specification
Graphics Language Monitor Specification
Home Computer Floating Point Specification
Home Computer Equation Calculator Specification
Home Computer system memory, CRU, and interrupt mapping specification
Software Development for the Texas Instruments Home Computer (Spec, 1979-05-24)

Home Computer Functional Specification, also known as 'TI-99/4 Home Computer Functional Specification'
Detailed System Specification
RAM Expansion Specification
Infrared Controller Specification
Cassette Peripheral Specification
I/O bus evaluation
I/O Cable Specification

Texas Instruments (DSG) Specification Control Drawing 984039 “Keyboard, Unencoded, without Keytops”
TI EPN3621 Thermal Character Printhead Specification
TI DSG Dwg. LU2214191 “Description, PVOLTs IC” – functional description of 2543
TI DSG Dwg. 2210840 “IC, Switching Voltage Regulator” – data sheet on 2543
TI DSG Dwg. LU2214194 “Specifications, Motor Drive IC” – func. descrip. 2444A
TI DSG Dwg. 2210843 “Integrated Circuit, Motor Drive” – data sheet on 2444A
TI DSG Dwg. 999256 “Motor, Stepping Paper Drive”
TI DSG Dwg. LU2214192 “Specification, Power Good IC MOG 2613” – func. descrip. 2613
TI DSG Dwg. 2211371 “Integrated Circuit, Power Good” – data sheet on 2613

TMC0430 Graphics Read Only Memory Specification (Specification 1015960)
TMS4732 Read Only Memory Manual
TMS-4732/4364 Read Only Memory Specification
TMS-4016 Random Access Memory Specification
TMS4027 Random Access Memory Manual
TMS4116 Random Access Memory Manual
TMS9901 Input/Output Controller Manual
ASTEC RF Module Specification (TI Specification 1501513)
TMS 9918A Video Display Processor Preliminary Description (Spec)
TMS9918 Video Display Processor Specification (Spec),
TMS9918 VDP Video Display Processor Data Manual (Data Manual, 1979-06-25, Revised)
9918A Data Sheets

TMS9919 Sound Generator Controller Specification (Spec, 1979-10-16, Released)
Sound Generator, SN94624 (Spec)
SN76489AN (TMS9919) Data Specification for the Sound Generator

RS-232/Parallel Port Software Design Specification (Spec)
TMS9902 Asynchronous Communications Controller Specification Sheet (Spec)
T DNCS.EM3278 [information on the operation of a TI 911 terminal]
T DNCS.EMDIAL [information on the operation of a TI 820 terminal]
SYNC-ANYNC Manual (TI#2223206-0001)

TI 99/8 Personal Computer (Spec)

TEC 380 (Spec)
CF-40051 CRT Controller Gate Array Specification (Hardware Spec)
CF-40052 I/O Controller Gate Array Specification (Hardware Spec)
Ground Squirrel Mechanical Drawing Package (Hardware Spec)
Ground Squirrel System Hardware Specification (Hardware Spec)
Ground Squirrel Keyboard Specification (Hardware Spec)
Ground Squirrel Software Module Specification (Hardware Spec)
Ground Squirrel RAM Expansion Cradle Specification (Hardware Spec)
Ground Squirrel ALC I/O Peripheral Bus Specification (Hardware Spec)
Ground Squirrel System Software Specification (Software Spec)
Ground Squirrel “Learn to Program” Tutor Specification (Software Spec)
VDE STD 380 [Performance Spec]
JIS STD (tbd) [Performance Spec]

Home Computer Video Monitor Specification (Hardware Spec)
Solid State Software™ Module Specification (Hardware Spec)
Specification for PCB Mount Double Row Right Angle Header TI Part Number 1044501



#130 mizapf OFFLINE  

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Posted Sat May 5, 2018 2:41 PM

I just committed the TI-99/2 implementation; you can get it by pulling from Github, and all others may wait until the last Wednesday of this month, as always.

 

I got both versions running, Fabrice's 24K version as well as Klaus' 32K version. Next thing is the cassette interface, then Hexbus.



#131 Schmitzi ONLINE  

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Posted Sat May 5, 2018 6:59 PM

KL99 PM FB :)



#132 acadiel OFFLINE  

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Posted Sat May 5, 2018 7:10 PM

I just committed the TI-99/2 implementation; you can get it by pulling from Github, and all others may wait until the last Wednesday of this month, as always.
 
I got both versions running, Fabrice's 24K version as well as Klaus' 32K version. Next thing is the cassette interface, then Hexbus.

Can you communicate with the person that did the Cc40 emulation when you are done with Hexbus so they can integrate it? The 74 and 95 emulations can then also use Dockbus. :)

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#133 OLD CS1 OFFLINE  

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Posted Sat May 5, 2018 10:21 PM

Klaus,

 

I have secured us a venue for Friday, including a block of rooms.  Can an extra day entice you to visit this year?  Maybe get all the 99/2 stuff together in one room for a full day (8am to 11pm.)  Come check out the Faire thread.



#134 mizapf OFFLINE  

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Posted Sun May 6, 2018 5:15 AM

Can you communicate with the person that did the Cc40 emulation when you are done with Hexbus so they can integrate it? The 74 and 95 emulations can then also use Dockbus. :)

 

As soon as I get it working on the 99/2. :)

 

By the way, for those of you who build MAME from sources (I mean, who doesn't? ;) ), this is the make command that I use:

 

make -j4 SOURCES=src/mame/drivers/ti99_4x.cpp,src/mame/drivers/ti99_4p.cpp,src/mame/drivers/ti99_8.cpp,src/mame/drivers/geneve.cpp,src/mame/drivers/ti99_2.cpp REGENIE=1 TOOLS=1

 

which builds a TI-only MAME.



#135 mizapf OFFLINE  

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Posted Sun May 6, 2018 7:01 AM

@Fabrice and Klaus: Could you please do the following speed check on your machines:

 

5 CALL CLEAR
10 FOR I=1 TO 2000
20 NEXT I

 

and then add lines 6 to 8 (line 7 has a full line of characters, here the asterisk)

 

5 CALL CLEAR
6 FOR I=1 TO 24
7 PRINT "****************************"
8 NEXT I
10 FOR I=1 TO 2000
20 NEXT I

 

This time, the start of time is the moment when the screen has been filled (i.e. when you are sure that line 10 has been reached).



#136 fabrice montupet OFFLINE  

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Posted Sun May 6, 2018 11:26 AM

Here are the results (I have used a real chronometer and tested several times to refine to results):

First program: 4"77
Second program : 7"25 (between the execution of the first line and the last one) . Sorry I don't understand what you mean by "This time, the start of time is the moment when the screen has been filled (i.e. when you are sure that line 10 has been reached)." because if I begin to count when the line 10 is reached, the result is the same as the first test.


Edited by fabrice montupet, Sun May 6, 2018 11:31 AM.


#137 mizapf OFFLINE  

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Posted Sun May 6, 2018 12:40 PM

The point is: When the screen is filled with characters, the CPU gets less time for computing. The computer should then significantly slow down.

 

The video controller of the 99/2 holds the CPU while it creates the scanline. For that reason, the engineers introduced the "BEOL" (blank end-of-line) character: When this character is encountered on a line, the HOLD line is cleared, and the rest of the scanline is blanked.

 

This phenomenon also described in the technical manuals. [TI992_Product_Specification.pdf, section 3.3.1]


Edited by mizapf, Sun May 6, 2018 12:43 PM.


#138 fabrice montupet OFFLINE  

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Posted Sun May 6, 2018 1:55 PM

OK, I understand :-)
Indeed, the computer is slowed by the display use. The result is 6"50

A bigger loop should permits a more accurate result. We have to take account the time delay between the retina/brain/nerves and finger ^^ A loop to 2000 is very short for the 99/2.

 



#139 mizapf OFFLINE  

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Posted Sun May 6, 2018 1:58 PM

This is nevertheless much faster than expected. My emulation runs the loop in 12.5 secs (clear screen) and 24.4 secs (full screen). I have no clue why, unless the CPU clock is 10.7 MHz and not 5.35 MHz, as I assumed.



#140 mizapf OFFLINE  

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Posted Sun May 6, 2018 2:25 PM

New try: Please use this program.

 

10 CALL CLEAR
20 CALL HCHAR(1,1,79,768)
30 FOR I=1 TO 5000
40 NEXT I

 

First run should be without line 20, second run with line 20. Interestingly, the 24K version is faster than the 32K version in emulation (with the same program). I'm curious about Klaus' results.



#141 fabrice montupet OFFLINE  

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Posted Sun May 6, 2018 2:52 PM

The screen is filled with "o" near instantly.

The result: 28"2  and 18" without the CALL HCHAR line.


Edited by fabrice montupet, Sun May 6, 2018 3:01 PM.


#142 mizapf OFFLINE  

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Posted Sun May 6, 2018 5:05 PM

I have some trouble getting the cassette running. I can already do a SAVE CS1, and something is recorded to the WAV file, but it does not load. From listening I'd say it sounds good, but the 99/2 disagrees.

 

How is the tape recorder connected? On the photos I see two jacks at the backside; are they used for the recorder?

 

Would some of you mind to save a short program to a tape recorder or to whatever is capable of recording the output?



#143 kl99 OFFLINE  

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Posted Mon May 7, 2018 1:18 AM

There is no motor control jack on the TI-99/2.
Sorry, i was busy on the weekend with Ds990 and TI-99/4. Will get back to the 99/2 soon.

#144 mizapf OFFLINE  

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Posted Mon May 7, 2018 4:06 AM

No hurry, the end of May is still far away. (Rhyme not intended.)

 

I know there is no motor control (there is not even a CRU bit for it). I wrote some nonsense in the description like "compatible cassette plug" (must have dreamed it); on the other hand, I wondered what could be those two jacks at the back. As I said, I guess one is tape input, the other is tape output.

 

The speed tests are quite interesting for me. As Fabrice showed, the real iron is much faster than the emulation, which could mean that the clock is not divided by 2, as written in the specs. Well, the RAM wasn't 2K either, as written - I tried to give it 2K only, and it crashed because of an unmapped memory access, so not even Fabrice's ROMs work with the 2K memory.

 

If you find some time, please try to save some program to tape, and also to load/save from Hexbus.



#145 fabrice montupet OFFLINE  

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Posted Mon May 7, 2018 1:24 PM

OLD and SAVE commands hangs my 99/2 or make it reset.



#146 RickyDean OFFLINE  

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Posted Mon May 7, 2018 1:35 PM

No hurry, the end of May is still far away. (Rhyme not intended.)

 

 

Oh, you're just a poet and don't know it.  ;)



#147 fabrice montupet OFFLINE  

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Posted Mon May 7, 2018 1:56 PM

Update:  I replaced the 0.1 uF capacitor (C9 on the schematics) on the TAPE IN line and now the OLD command works :-)
Now, I succesful load TI Basic program into the 99/2. On the other side, the SAVE command still doesn't work. I continue to study the problem.



#148 mizapf OFFLINE  

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Posted Mon May 7, 2018 3:44 PM

You can load 99/4A programs? Again a surprise. What I get from the SAVE command is something that does not even remotely resemble the sound that we know. In particular, the frequency is different, and it seems there is no double saving (two instances of every record).

 

I did my tests on Klaus' 99/2, I should say. Maybe they did some changes.



#149 fabrice montupet OFFLINE  

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Posted Mon May 7, 2018 4:52 PM

Yes :-)  I made a copy/past of the little program below into js99er using TI Basic,  I recorded it with the SAVE CS1 command and then I played the generated  .wav  file with Audacity without any correction. On the 99/2, the OLD CS1 command accepted the program. I ran it with success.

100 REM SPEED TEST 
110 PRINT "START"
120 K=0
130 K=K+1
140 A=K^2
150 B=LOG(K)
160 C=SIN(K)
170 IF K<1000 THEN 130
180 PRINT "STOP"
190 END 

At the first time I used the OLD CS1, I was surprised to see the 99/2 stopping the display during the READ operation. When the program is loaded, the display is active again.  Even if this is the normal way for the 99/2 to work, during a few seconds I have the impression that computer has crashed ^^



#150 mizapf OFFLINE  

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Posted Tue May 8, 2018 12:00 AM

The 32k version prints a note on the screen "* screen will be blank to read".




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