Re: RTVGA 8 bits on PC/104 socket and converter to ISA with MonochromeVGA

Posted on 2020-03-15, 04:30

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I post the schematic to see if anyone can think of what are the pins that I have not yet been able to identify and have left as UNK: https://github.com/spark2k06/hardware/blob/ma … TVGA_SCHEMA.png

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RTVGA 8 bits on PC/104 socket and converter to ISA with MonochromeVGA

Posted on 2020-03-08, 18:42

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

After getting ideas from here and there , I have started the development of a double project consisting of an 8-bit graphics card based on the IC RTG3105iEH and in PC/104 socket, which makes it compatible with the new one NuXT v2.0 and on the other it is also with the other project I have gotten …

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Re: Arrived ISA 8 bit RTVGA boards

Posted on 2020-03-08, 08:47

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

on the way another ISA8 VGA board - has Chips F82C451 or 82С452 with 256Kb RAM, datasheet says fully IBM CGA/MDA/EGA/VGA compatible. I can't find the datasheet anywhere about RTG3105iEH, do you have any links? I would like to make my own design based on this IC with some additional feature, and I …

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Re: Arrived ISA 8 bit RTVGA boards

Posted on 2020-02-16, 07:34

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

on the way another ISA8 VGA board - has Chips F82C451 or 82С452 with 256Kb RAM, datasheet says fully IBM CGA/MDA/EGA/VGA compatible. I can't find the datasheet anywhere about RTG3105iEH, do you have any links? I would like to make my own design based on this IC with some additional feature, and I …

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Re: Internal OPL3 ISA 8 bits (PCXT)

Posted on 2020-02-04, 04:19

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Grzyb wrote on 2020-02-03, 22:00: Well, "Adlib Gold FM" is correct, but then you would need to rename the second option to "SB Pro 2 or later FM"... Done! First post updated 😀

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Re: Internal OPL3 ISA 8 bits (PCXT)

Posted on 2020-02-03, 21:22

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Grzyb wrote on 2020-02-03, 21:06: BTW: that "Adlib Gold" is misleading, may suggest the card is compatible with Gold, which of course isn't true - just "Adlib" would be better Adlib alone, either ... because it is OPL2. Adlib Gold FM, maybe?

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Re: Internal OPL3 ISA 8 bits (PCXT)

Posted on 2020-02-03, 20:10

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I update the first publication with a new design to improve the finish of the slot and update the screen printing to get better combinations of I / O ports, according to the last commented.

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Re: Internal OPL3 ISA 8 bits (PCXT)

Posted on 2020-02-03, 16:20

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Some people might want to use that OPL3 card together with something else, most likely SB 1.x/2.0 So it would be nice to be able to disable the 38x port range... 38x and 22x - SB with OPL2, CMS, DSP 24x - OPL3 So, such a configuration could cover all the needs ?: 0 - 0: 388h 0 - 1: 220h + 388h 1 - …

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Re: Internal OPL3 ISA 8 bits (PCXT)

Posted on 2020-02-03, 15:25

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, according to this website the ports are: 220h or 240h (selectable) and 388h -> Sound Blaster Pro II, 16, 32, AWE32/64 and Live, ESS 688, etc. Only 388h -> Adlib Gold, Windows Sound System So in the SPLD I will always keep the 388h present and leave the DIP Switch configuration such that: * 0 - …

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Re: Internal OPL3 ISA 8 bits (PCXT)

Posted on 2020-02-03, 13:30

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The configuration is done with the SPLD, and in principle I did not want to touch the design of the PCB unless it was strictly necessary, although the silkscreen of the DIP Switch could be modified according to the SPLD programming, where I can set the I/O ports, or to use several at the same time …

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Re: Internal OPL3 ISA 8 bits (PCXT)

Posted on 2020-02-03, 12:53

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

four possible ports, including the default 388h used by Adlib and the 220h to "cheat" some games pretending to be a Sound Blaster SB decodes OPL at both 38x and 2xx. If you want SB compatibility, I would recommend one jumper to enable/disable 38x, and separate jumper(s) to select 22x/24x/... You …

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Internal OPL3 ISA 8 bits (PCXT)

Posted on 2020-02-03, 08:42

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I designed a new low profile OPL3 sound card from the scheme provided by the existing TexElec Resound OPL3 in which, as you can see, it is a four-channel sound card based on the Yamaha's YMF262 chip and use of two high quality WIMA film capacitors per channel to prevent the passage of direct current …

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Re: Arrived ISA 8 bit RTVGA boards

Posted on 2020-01-22, 12:39

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

on the way another ISA8 VGA board - has Chips F82C451 or 82С452 with 256Kb RAM, datasheet says fully IBM CGA/MDA/EGA/VGA compatible. I can't find the datasheet anywhere about RTG3105iEH, do you have any links? I would like to make my own design based on this IC with some additional feature, and I …

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Re: RTC ISA 8 bits (Very Low Profile)

Posted on 2019-12-21, 05:55

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Kicad project, gerbers and SPLD files already available: https://github.com/spark2k06/hardware/tree/master/RTC8088

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Re: RTC ISA 8 bits (Very Low Profile)

Posted on 2019-12-17, 22:03

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Now available in Tindie, soon I will publish the gerbers, the Kicad project and the SPLD files. https://www.tindie.com/products/spark2k06/rtc … w-profile-spld/

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Re: Port 80 POST card in XT

Posted on 2019-11-22, 07:09

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It could also be related to the clock frequency of the ISA BUS, which will be slower in XT. The Chinese boards I think they have a frequency detection option, being possible to configure it with the tactile switch that they have integrated into the board. It is possible that they are designed for a …

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Re: RTC ISA 8 bits (Very Low Profile)

Posted on 2019-11-20, 09:37

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

New design removing discrete logic and replacing it with an SPLD: https://lh3.googleusercontent.com/4l5t81hm_o31hZGK-TIgPwvxxjzrGwF-ueV0VP_lUGaFG_X72n1-JrpB_3X2AQm-OL-DuXcocGXkDe7Qw1H5iNBpRxLvhkN3iBiSUotEj6V5hREqXk2n2wSm4LpMiA6EtYhd63cQ5Vs=w1047-h759-no I still have to check the connections and …

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Re: MonochromeVGA (simulating a monochrome monitor)

Posted on 2019-11-12, 10:04

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by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Another video of a MonochromeVGA user testing its operation on a Sony Triniton CRT monitor and the MiSTer 😀 https://www.youtube.com/watch?v=Ul84tcvvPOk

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Re: NuXT - micro-ATX IBM XT (LGR review)

Posted on 2019-11-06, 10:08

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by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Sold both! ]Did you ever bother to connect JD for a resolution to your issues? How about a youtube video or blog post to air it out? All this secrecy is a bit um shall we say unusual. We know the first revision boards had serial issues and that is documented what revision was yours? Revision 1.2 Yes …

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Re: RTC ISA 8 bits (Very Low Profile)

Posted on 2019-10-31, 19:31

by

by spark2k06

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

keropi wrote: looks nice , kudos! Thanks! 😀

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