mizapf
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Posts posted by mizapf
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The MAME emulation allows for selecting the AT29C040 or AT29C040A variant, which could help with adapting software to the different flash roms.
(OSD -> Machine configuration -> Boot from...)
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PFM is a replacement for the boot EPROM based on a flash memory chip. I emulated it in MAME, but don't have it in my real machine.
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Umm, I have a Geneve with SCSI, but no PFM and no TIPI, and not planning to get one. So option 1?
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These are the contents of Tombstone City's GROM:
6000: DATA >AA,>01,>01,>00,>00,>00,>60,>10 6008: DATA >00,>00,>00,>00,>00,>00,>00,>00 6010: DATA >00,>00,>60,>23,>0E 6015: TEXT 'TOMBSTONE CITY' 6023: DST >0900,@>834A 6027: CALL [email protected]>0018 602A: MOVE >0010 BYTES FROM [email protected]>6077 TO [email protected]>0C80 6031: MOVE >0032 BYTES FROM [email protected]>6087 TO [email protected]>0AE0 6038: MOVE >0030 BYTES FROM [email protected]>60B7 TO [email protected]>0B40 603F: MOVE >0010 BYTES FROM [email protected]>60E7 TO [email protected]>0B80 6046: MOVE >00B8 BYTES FROM [email protected]>60F7 TO [email protected]>0BC0 604D: MOVE >0008 BYTES FROM [email protected]>61AF TO [email protected]>0CC0 6054: MOVE >0010 BYTES FROM [email protected]>6067 TO [email protected]>0384 605B: BACK >06 605D: MOVE >03CC BYTES FROM [email protected]>61B7 TO [email protected]>1002 6065: XML >70 6067: DATA >1B,>1B,>1B,>1B,>1B,>1B,>1B,>1B 606F: DATA >6B,>4B,>CB,>1B,>1B,>4B,>DB,>44 6077: DATA >00,>5A,>3C,>7E,>7E,>3C,>5A,>00 607F: DATA >00,>18,>FF,>7E,>7E,>FF,>18,>00 ... 6577: DATA >01,>03,>8F,>38,>90,>03,>04,>9F 657F: DATA >BF,>DF,>FF,>00,>00,>00,>00,>00 6587: DATA >00,>00,>00,>00,>00,>00,>00,>00 ... 77F7: DATA >00,>00,>00,>00,>00,>00,>00,>21 77FF: DATA >06
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On 12/7/2020 at 10:53 AM, wietze said:Just opened her up, and it seems to have a TMS9929NL vdp chip.
I currently connect the machine to the display using a `Texas Instruments TV PAL Encoder PHA 2030'.
Could the use of a PAL vdp chip cause the abovementioned graphical behaviour with some programs?
(Edit: some thread in this forum suggests that all cartridges encountered are PAL/NTSC compatible; so I assume answer is `no').
How come there is a wrong VDP inside your console? The non-A variant should only be in the TI-99/4, I should have expected.
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The GROMs could have been intended as a solid state storage, rather than a part of the GROM address space. But this definitely requires a 32K expansion where the code is copied to.
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For some seconds (as we have schematics), I thought this could be easily emulated in MAME, but I guess it would not make too much sense. I would also have to emulate devices that connect to that card.
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Oh, this is not the PAL HF modulator? I did not know there is component output PAL encoder.
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The only difference between PAL and NTSC is the refresh rate (50 Hz vs. 60 Hz) which is not compensated in the games that I know of (which means some games are significantly slower on PAL consoles). The higher lines count (NTSC has 525 lines vs. PAL with 625 lines) is not relevant and results just in a wider border; the logical geometry (resolution of the VDP) is the same.
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The REPL99 is from SNUG and delivers the GRMCLK line from the missing video processor. If you have a EVPC card with V9938, you have to remove the 9918/9929 VDP in the console. By this, you lose the GRMCLK as well, so your GROMs and sound stop working. The original way was to use a separate cable from the external EVPC card back to the console. The REPL99 goes into the open socket of the video processor.
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Remember ... when we wondered whether to get that green or the amber monitor - with a bit of melancholy when thinking about all the colors we already had on the TI and other home computers - or rather that expensive "VGA monitor" with "MultiSync" ...
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99 Shades of Red ...
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If you can afford some more patience, I would recommend not to switch too early to another OS before this problem is solved. Maybe there is some version requirement for some library.
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You have to install the libSDL2_ttf library in your operating system. This is required for MAME.
For Raspbian this should be something like "sudo apt install libsdl2-ttf"
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I think I can still build MAME on 18.04 (I have both versions as VMs.) However, the 18.04 Ubuntu is already nagging me to get upgraded.
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In the first 0.153 secs, I seem to see the left (red) console first, then I get into a state of visual confusion.
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Interesting. The lower maria (especially the one above the Tycho crater) seem to be in front, while the edges are further back.
(When I am wearing anaglyph glasses for more than a few seconds, the Auto White Balance in my brain seems to become shifted. 🙂 )
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When you peek out of the window at night and are glad about "Homeoffice". (Yet another pseudo-anglizism in German; I guess you say "work from home" or WFH.)
First snow here, right on time for December. It was not really expected after those warm November days (more than +10°C, I walked outside without a jacket.) I'm here at about 50°N latitude.
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What I miss of my camera is a way to see the picture of the viewfinder on a laptop. I can connect the camera to a computer, but only to download pictures or movie clips. As of now, I have to squeeze myself between the telescope on its tripod and the edge of the roof hatch to watch the backside of the camera, while forming some bizarre figure with my body, almost defying gravity, but when it starts hurting, you know that your body does not agree with what the h*** you are doing there. Your fingertips are getting numb while temperature is crossing 0°C, and you desperately try to fiddle that screw back into its hole where you just unscrewed it some degrees too far. Welcome to amateur astronomy.
Maybe some day I'll have a look at real astro cameras.
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Right, it was JPEG. I just meant to say this is the file as I got it from the camera, which was set to save as JPEG. The camera already does a good job with JPEG creation from RAW, better than all my attempts until now.
The last picture is one of four that I stacked for the image in posting #3816.
The focus issues can possibly indicate a problem with my mirror; my LX200 has some nasty mirror shift, a typical problem of SC-type telescopes (due to the mirror being pushed and pulled away from its center). I'll have an eye on that next time. One thing to do against that is to wander across the focus point and then turn back some amount so that the mirror becomes leveled again.
Hobby astronomers may know that feeling: "Now is that sharper or not? Can't really tell." I used the magnifying function of my a58 for manual focusing (and I have a focus motor 🙂 ).
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Sure, you can process the picture as you like. Maybe you'd better use an original picture without any processing from me, directly taken from the camera. Also, this is not stacked, but the stacking did not really improve the quality.
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That's really early. But as you wrote 0.97R, that rings a bell ... I remember I had to use such a release for my HFDC+MFM hard disk back in those days. The 1.14 was for floppy.
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So, this is better in terms of sharpness, but the terminator is almost gone on the left side; we have 99% full moon. I did apply some unsharp masking and enhanced the contrast, but the source images were already much better than the last ones.
Fun fact: Each pixel of this image covers an area of 1.6 km x 1.6 km, or 1 mile x 1 mile. Just in case you expect to see the lunar landers somewhere.
(the image of the Moon is 2460 pixels wide, the Moon diameter is 3474 km)
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Hardware Replacement of TMS9928A with V9938 In a Simple as Possible Manner
in TI-99/4A Computers
Posted
No, I think this referred to some bits in the video registers of the TMS9918/28/29 (NTSC or PAL) that were unused, and which now have a meaning with the V9938.