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#1
SIG X68000 / Re: SCSI for Expert HD (split ...
Last post by bobrocks95 - Today at 12:32:50 PM
Quote from: HIggy on April 23, 2024, 09:12:55 PM@bobrocks95 ok, so you don't physically have your X68000 yet just doing the ground work. No problem.

Yes you need a way of loading floppy disks images or physical disks to install the SCSI driver to allow HD access. Chicken and egg.

Are you ok with soldering and stuff?

I would buy IDC ribbon cable (50 way) and IDC connectors ready to make floppy and HD cables. (Can use a vice instead of proper IDC crimp tool to save some money).
You can also use to make either 20 or 26 pin SASI internal cable.

Is your X68000 coming with any disks? Otherwise you might go to the effort of sourcing a Master disk only to find your disk drive needs refurbishment or it is not fixable (seems to be 4 small caps that leak).

A Gotek connected to external floppy port is simple/cheapest option. Do you have one with other Retro hardware you can borrow? You only need it to install the SCSI driver, then can disconnect.

But with 2mb only, you will be limited to what you can run from HD image.

Finally where in the world are you?

Thanks for the info, for installing SxSI that's what it sounded like- chicken/egg.  I'm in the US and experienced with soldering, ready to recap the whole system if I have to.  Console5 has a cap kit for my model thankfully.

I've ordered some games that are known working that will allow me to test the drives after cleaning, greasing, recapping if necessary...  Hoping to get them working but you never know.  They'll look nice on the shelf (some have mold and will stay there), but would be a shame to not be able to play any of them.

I could pick up a Gotek and start with that, see how compatibility is.  I just thought I had read floppy emulators generally didn't work as well as SASI/SCSI emulators.
#2
SIG FM-Towns / Re: Potential for Marty YPbPr ...
Last post by Cyothevile - Today at 12:28:30 PM
The car marty also uses the same special CRTC that does internal downscaling. Forgot to mention that.

So it colorspace converts and downscales to 480i.

Also I was mistaken. That ASIC doesnt output digital YUV. It takes a digital RGB input. When I ran a test program on marty my friend wrote, I was able to discover this
#3
SIG FM-Towns / Re: Potential for Marty YPbPr ...
Last post by Cyothevile - Today at 12:27:16 PM
So back to this.

I did more RE work. Here is how marty works.

Marty runs just like the computers with a special CRTC that takes an input of digital RGBHV along with an NTSC subcarrier frequency thats exactly 8x the 480i clk specification.

The CRTC divides by 8, performs RGB to YUV colorspace conversion, and outputs 2 channel 8 bit video to the svideo DAC. It also outputs composite video. So technically its a mixed signal ASIC.

You can regenerate csync if you AND the hsync and vsync together with a NOT blanking signal into it. The issue is that CRT and PVM cannot accept 24khz signals. So it would be a moot point in modding it for RGBS. RGBHV however is totally possible but I have yet to know if anyone is interested in such a modification. I think the Towns operates on 18 bit RGB.
#4
SIG FM-Towns / Re: FM Towns II-HR went from w...
Last post by Cyothevile - Today at 12:23:00 PM
Quote from: solidpro on Today at 02:38:17 AMI've found this mod https://nfggames.com/forum2/index.php?topic=6499.0 to turn an ATX power supply into a compatible one for the FM Towns. I wondered if, like on ATX you can ground the GREEN pin with a BLACK to auto-power-on, there is a similar pin on the FM Towns PSU....?

Here is how all towns power supplies work:

Power on signal switch goes to GND. Kicks on and off PSU with discrete logic on PSU.

Towns OS off pin goes to GND. PSU turns off.

You can wire an ATX directly to the connector on mainboard if you know the pinout which is trivial to solve. Just desolder wiring harness from dead PSU and find what pins are GND, 12v, -12V and 5V. Then wire an ATX to it. When ATX switch is turned on, the pc will turn on. Only downside is the PSU can only be controlled by ATX on and off switch, and not the towns OS OFF or original power switch.

This is all assuming you cant troubleshoot whats wrong on the original.
#5
BST / Re: FS Etarikashikoshi X68000 ...
Last post by bobrocks95 - Today at 12:20:57 PM
Hey, if this is still available please shoot me a PM!  I can post other socials and my ebay to show credibility and totally willing to do a goods/services PayPal exchange with me covering the extra fees.

Let me know thanks!
#6
SIG FM-Towns / Re: FM Towns II-HR went from w...
Last post by solidpro - Today at 02:38:17 AM
I've found this mod https://nfggames.com/forum2/index.php?topic=6499.0 to turn an ATX power supply into a compatible one for the FM Towns. I wondered if, like on ATX you can ground the GREEN pin with a BLACK to auto-power-on, there is a similar pin on the FM Towns PSU....?
#7
SIG FM-Towns / FM Towns II-HR went from worki...
Last post by solidpro - April 23, 2024, 11:59:40 PM
Hey Everyone

I bought an FM Towns II-HR which was powering up fine and then just decided not to do anything. I disassembled the machine and completely recapped the power supply with new RS-Components caps and it still doesn't power on.

There is about a 10% chance that on the PSU, I got capacitors C58 and C52 the wrong way around (1 of them is 2200uf and the other is 1000uf) - does anyone have a point of reference for the II-HR PSU as to what these two caps are?

Having said that, I suspect it would power on even if they were switched, so it must be something else. I can hear a very slight hum when the PSU is plugged in, me thinking it's getting power. The power button is 'soft' so I don't know if there is another way to insipire a power on?

Also there are *a lot* of electrolytic caps on the mainboard, so I didn't replace them - I could not spot any signs of leakage. But could that be worth doing?

Thanks
#8
SIG X68000 / Re: X68000 Booting Query
Last post by owen2471 - April 23, 2024, 10:18:00 PM

Thank you
#9
SIG X68000 / Re: X68000 Booting Query
Last post by HIggy - April 23, 2024, 09:18:09 PM
Not sure on Super (SCSI I think).
Does SRAM still need setting to tell it to boot from HD?
Battery is now probably dead, so SRAM could need setting up.
So boot floppy Master disk and type switch.x and check options.

Also you sure you have not removed the CF card :) 10 years memory:)

Also the App called 'Papago' (I use on Android) is great at Japanese translation.
#10
SIG X68000 / Re: SCSI for Expert HD (split ...
Last post by HIggy - April 23, 2024, 09:12:55 PM
@bobrocks95 ok, so you don't physically have your X68000 yet just doing the ground work. No problem.

Yes you need a way of loading floppy disks images or physical disks to install the SCSI driver to allow HD access. Chicken and egg.

Are you ok with soldering and stuff?

I would buy IDC ribbon cable (50 way) and IDC connectors ready to make floppy and HD cables. (Can use a vice instead of proper IDC crimp tool to save some money).
You can also use to make either 20 or 26 pin SASI internal cable.

Is your X68000 coming with any disks? Otherwise you might go to the effort of sourcing a Master disk only to find your disk drive needs refurbishment or it is not fixable (seems to be 4 small caps that leak).

A Gotek connected to external floppy port is simple/cheapest option. Do you have one with other Retro hardware you can borrow? You only need it to install the SCSI driver, then can disconnect.

But with 2mb only, you will be limited to what you can run from HD image.

Finally where in the world are you?