jens-eike
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Posts posted by jens-eike
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On 12/20/2020 at 10:01 AM, globeron said:
This is the original chip. I put the sticker on it as otherwise i cannot identify how to insert it.
It is clearly marked already: TI used the groove at the side of pin 1 (to 20) on many chips in the 1970s
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Yes, my first computer was a TI-99/4 with PAL modulator (and internal speaker/pot). TI abandoned the NTSC monitor bundling before and used the TMS9929 (no A).
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On 11/12/2020 at 4:32 PM, acadiel said:
A hardware question for you - instead of eight 16k x 1 bit chips, how easy is it to replace with one 16k x 8 chip? What would the wiring look like?
with a TMS9118 it would be only two TMS4416 RAMs (16k*4)
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the keyboard and innner functions (ASCII-codes) are identical, only difference came with the character definition files (CHARA1) in e.g. TI-Writer. You had to type [ for Ä, { for ä, \ for Ö, ] for Ü and so on (German language)
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I used the board to make a GRAM-device (like GRAM-Kracker) with battery backup and logic for bank switching the >6000 ROM XB-style.
The two stacked NEC D43256 are the GRAM, two 6264 (below the leaked battery) are the ROM (when write protected).
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On 7/16/2020 at 9:26 PM, acadiel said:
Not meaning to necroressurect a thread, but I got a nice reproduction of the Heiner Martin 1985 cart board in the mail from Mantadoc. It has two spots for 2764s along with the GROM logic ICs.
Does anyone know which ones of these were GROM and which was ROM, and what the original use cases of the 8K GROM + 8K ROM was? I see people made glorious modifications above to 128K and 256K, which is awesome.
The EPROM(s) parallel to the 'LS161 counters is the GROM and the EPROM perpendicular is the ROM.
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The QI power supply (with 2 wires in) works from 18V DC.
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On 3/7/2020 at 12:05 AM, Ed in SoDak said:
Got a link? Maybe archive.org has it.
16 TMS9995 in parallel:
http://famkoplien.de/henry/TI99/
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My Geneve has heat sinks on the regulators, hence it cannot use the case - but the back part of the case helps with the correct orientation and seating. When you close the PEBox's lid, the foam will press the Geneve into its slot.
As you can see, I've done it with the Geneve and HFDC. The box is upright (drives on top).
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At one point several years ago, there was a website up that showed a 9900-based parallel computer using 16 TMS-9900 CPUs, each on its own circuit card with memory and IO on each card. Unfortunately, the last time I went looking for the site, it was gone. I haven't checked to see if the Wayback machine captured it though. . .so I'll have to look to see if I still have the URL.
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Not a BwG card: see this picture: https://www.s-n-u-g.de/bwg/index_fr.php
The TMS9901 is typically a sign of a CorComp card.
My CorComp card has a 1773 controller, but I have seen the 2793 mentioned (on whtech?), they are software compatible.
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Also can anyone explain why no-one makes a video lead for PAL systems? They are available for NTSC systems but not PAL and the recommendation is to mod the modulator to output composite video, seems strange as surely the modulator is only there in the first place to modulate the video signal to RF for old TV's.
There is no simple PAL video cable, the console has outputs for YUV (aka YCbCr/YPbPr?) component signals. Some modern TVs can take these directly (my LG 42LF65 did). Otherwise, the PAL modulator mod gives you the composite signal (slightly better quality than from US NTSC consoles), or you could use the SCART/Peritel RGB modulator (mostly sold in France) for the best quality picture.
A schematic for an RGB-enoder was in the November 1988 issue of the ChicagoTImes, I built this twice, good stable picture.
Then there are upgrades based on the 9938 VDP ("80column cards"), or the F18A for VGA output.
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I'm concerned about multiple drivers on the bus. MAybe not a big deal as long as the signals settle down on schedule.
With proper address decoding, only one CRU device is active at any time - so this shouldn't be an issue. The 9901 in the console isn't fully decoded, so keep out of it's address range!
http://www.mainbyte.com/ti99/schematic/schematics.html has several schematics, the FDC card has the '251 connected directly to CRUIN.
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Since CSYNC comprises high frequency signals in the range 15.6kHz, I would connect it to HSYNC first. VSYNC is the 50/60Hz frame signal, and you would miss the line synchronization if using this input only.
If this fails, try parallel connection to H and VSYNC
If that fails, too, try a circuit with a LM1881 sync separator (8-pin IC and some passives)
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Or (I think)
LI R2,@ENDDAT CI R0,R2
Wouldn't that compare R0 to 2 (immediate value), C R0,R2 compares two registers. The assembler option "R" does an operation like "R2 EQU 2"
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Can you access the printer port directly through Windows 7 and up? As I recall, the problem with using an XM1541 cable is that past Windows XP the printer port is not directly accessible.
What about a USB-based rendition?
From the docs (tiif.txt): "Since Windows XP and newer doesn't allow direct access to the IO-port of the LPT-card, a system kernel driver is required. I decided to use TVicPort (http://entechtaiwan.com/dev/port/index.shtm) which is free for non commercial use. This combination was successfully tested on a Windows 10 32 Bit PC with an onboard LPT-port and a Windows 10 64 Bit PC with a PCIe LPT-port."
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In comp.sys.ti was a post about a new version of the PC-IF:
https://groups.google.com/forum/#!topic/comp.sys.ti/WT3qdYD1tZE
the link to
acg-bonn.dyndns.org/~en/downloads/files/tiif.zip
still works, the file contains schematics and software from DOS to WIN32
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Maybe start with a simple one:
Let's assume I have r1 pointing to a byte in memory, and I want to test it for being zero (the byte that is!). What would be the shortest (fastest) way of doing that.
A possible solution might be something like:
MOVB *R1,R2 JEQ ITSZERO
This will (obviously) store the byte in R2 and set the flags. Apart from wasting a register (which is not that bad) I'm not really interested in writing the byte (back) to memory and don't want to spoil the cycles involved with it.
How about MOVB *R1,*R1 ?
Still testing for 0 without using any extra register, but slower (about 2 cycles).
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My old LCD-TV (LG 42LF65) took the TI signals on YPbPr input - best possible quality without any modulator!
The RGB circuit in "Chicago TImes" (ca. 11/1986) is quite easy, only a handful of transistors and passives. That is my favourite, if you have a RGB-capable Scart input.
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Another option would be the Mini Memory cartridge, it contains 4K RAM and the Line-By-Line-Assembler cassette tape. There is no need for a PEB or other expansion hardware, just a cassette recorder and the cartridge (with tape).
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Dear fellow TI'ers,
the TI-Club Errorfree invites you to the international TI-Treff 2016.The 31st international TI Treff will be held from September 30th to October 2nd in Denmark. The location is the Hotel Svalen in Hedehusene near Copenhagen.
The Treff starts on Friday and goes to Sunday afternoon.Friday is for set-up of the computers, and we'll have dinner at the "Porterhouse" in the city.
Saturday is for demonstrations of hard- and software, talking & exchange of ideas, auction, club presidents' conference and a dinner, afterwards computing till early morning (if you desire...).
Sunday is for more sharing of experiences and packing, or a tour of Copenhagen.
There is a conference room in the hotel at our disposal, rent (and dinner) is included in the room price, so we'll take a fee from "external" visitors.
At the Saturday dinner, this years Edgar Mauk award winners will be announced.
Prices:
A room is DKK 2390 for two nights (approx. EUR 319), including the meeting room and dinner.
Since we got allotted some rooms, please book (as soon as possible) your room through:
Jens-Eike Hartwig, phone +49-461-9787778 (best between 20:00 and midnight CEST) or
je_hartwig(at)yahoo(dot)com
The address: Hotel Svalen
Roskildevej 333
DK-2640 Hedehusene
Please do not book through the hotel or booking websites, since the rooms are pre-booked!
More information about Copenhagen: http://www.visitcopenhagen.com-
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The TI-99/4 was to have a TMS-9985 CPU, according to it's specifications, the internal RAM was at >8300. Later TI designed the TMS-9995, again with internal RAM - but why at >F000 and not at >FF00 to be contiguous with the NMI/LOAD vector at >FFFC...???
Internals about TI CPU and VDP design:
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TI-99/8 keyboard
in Tomy Tutor, CC40, 99/2, 99/8, Cortex, 990 mini
Posted
A plain copy is probably impossible, too many custom chips. The TMS9995 is non-standard with internal RAM disabled.... It would be easier to emulate the internals with a CPLD or alike.