Search found 109 matches

by Poobah
Tue Jan 08, 2019 9:30 pm
Forum: MiSTer
Topic: Newbie questions
Replies: 90
Views: 6881

Re: Newbie questions

I've been using M3 screws. They aren't exact, but seem close enough.
by Poobah
Tue Jan 08, 2019 1:11 pm
Forum: MiSTer
Topic: 680x0 cores
Replies: 67
Views: 6453

Re: 680x0 cores

FPGA chips come in several "speed grades", but the speed of a given chip is ultimately determined by the core and the clock(s) provided. You select an FPGA based on the requirements of your application. Saying an FPGA is "decent speed" doesn't mean anything.
by Poobah
Tue Jan 08, 2019 5:01 am
Forum: MiSTer
Topic: 680x0 cores
Replies: 67
Views: 6453

Re: 680x0 cores

PurpleMelbourne wrote:5CEFA9F23I7N is a decent speed Altera chip.


FPGA chips don't really have speeds.
by Poobah
Fri Jan 04, 2019 5:47 am
Forum: MiSTer
Topic: I/O Board
Replies: 265
Views: 55563

Re: I/O Board

So, looking at the datasheets for the Toshiba TOSlink receivers, and doing the math, assuming a perfect connection from the LED to the TOSLink cable, and max 2 dB cable loss, we'd ideally want an LED with an output between 16 and 163 mcd @ 650nm. Given the connection between the LED and the cable is...
by Poobah
Fri Jan 04, 2019 4:46 am
Forum: MiSTer
Topic: I/O Board
Replies: 265
Views: 55563

Re: I/O Board

Interesting.... BOMs I surveyed (not the wiki, which was 5.2 at the time) used very bright (600+ mcd) LEDs for TOSLink. I settled on one listed at LCSC: C54149 LED for TOSLink, that's a 620-630nm 926 mcd LED. It is fairly bright, but diffuse - worked well (Also discontinued, BTW) Doing the math, tha...
by Poobah
Thu Jan 03, 2019 5:31 am
Forum: MiSTer
Topic: I/O Board
Replies: 265
Views: 55563

Re: I/O Board

Some issues to investigate: 1) You'll need to know the forward voltage of the LED to really analyze if it is appropriate. Fortunately, it's just a a diode. Put your multi meter on the diode setting, connect it up to your LED and read off the forward voltage, it'll probably be 2.0 ish, but you never ...
by Poobah
Sat Dec 29, 2018 3:26 am
Forum: Hardware
Topic: Modern multisync monitors?
Replies: 26
Views: 3690

Re: Modern multisync monitors?

Well, hell, now I gotta spring for a U2410, that looks awesome.
by Poobah
Thu Dec 27, 2018 12:47 am
Forum: MiSTer
Topic: USB Hub board
Replies: 115
Views: 27412

Re: USB Hub board

So, I waded through the FE2.1 datasheet and the USB 2.0 device specifications
It appears that the amber LEDs should only light when there is an error condition or an over-current issue.
by Poobah
Wed Dec 12, 2018 1:02 am
Forum: MiSTer
Topic: I/O Board
Replies: 265
Views: 55563

Re: I/O Board

I use a 12mm M3 cap screw and nut
by Poobah
Sat Dec 01, 2018 6:39 pm
Forum: MiSTer
Topic: I/O Board
Replies: 265
Views: 55563

Re: I/O Board

Sorgelig wrote:It's just wires. What can be broken there?
As far as i know only Altair8800 core currently supports it.


Yes, true, not much that could be bad.
I always like to test when i do work for other people.
by Poobah
Sat Dec 01, 2018 4:02 pm
Forum: MiSTer
Topic: RTC board
Replies: 90
Views: 27209

Re: RTC board

I'm building some RTC 1.3 boards.
Debating on whether to populate the temp sensor, as it drives the board cost up significantly.

Any thoughts on when/if the sensor will supported? My thought now is NOT to populate it, so people can have a less expensive clock option.

Thanks!
by Poobah
Sat Dec 01, 2018 3:59 pm
Forum: MiSTer
Topic: I/O Board
Replies: 265
Views: 55563

Re: I/O Board

Are there any known cores that output serial data on the I/O board v5.5 serial (USB) connector?
I have several boards made up, and I'd like to test this functionality before I ship them

Thanks!
by Poobah
Sat Dec 01, 2018 4:19 am
Forum: MiSTer
Topic: SDRAM board
Replies: 174
Views: 42334

Re: SDRAM board

A good flux cleaning job does seem to be correlated with better performance, at least on the Winbond ones I've been building.
Almost all hit 167 on my DE10.
by Poobah
Tue Nov 27, 2018 3:38 am
Forum: MiSTer
Topic: Local Sellers for MiSTer Expansion Boards
Replies: 315
Views: 70434

Re: Local Sellers for MiSTer Expansion Boards

Hey all, Most of my boards and components have arrived, so I now have MISTer expansion boards available. I have a few made up, rest are build to order. In stock ready to ship: SDRAM XS v1.1 ... $28 SDRAM Universal v3.1 vertical ... $25 I/O Board v5.5 (All headers fully populated, heatsink, fan &...
by Poobah
Wed Nov 21, 2018 1:47 am
Forum: Hardware
Topic: Help getting my ST out of the attic and hooked up to a modern LCD monitor
Replies: 17
Views: 3057

Re: Help getting my ST out of the attic and hooked up to a modern LCD monitor

Anyway, I bought an NEC 19" MultiSync LCD1970VX. It'll be here in a few days. I need to order one of the Best Electronics' ST Multi Sync adapter cables and, assuming the monitor is good, I should be in great shape and I'll be able to use all three resolutions to boot. The NEC is a great choice...
by Poobah
Fri Jun 26, 2015 11:42 pm
Forum: CT60 / CT63 Area
Topic: CT60e is coming :)
Replies: 509
Views: 171837

Re: CT60e is coming :)

Definitely interested in 1, possibly 2
by Poobah
Sat Jul 12, 2014 5:52 pm
Forum: Hardware
Topic: Anyone still using SyQuest 44MB drives?
Replies: 13
Views: 2861

Re: Anyone still using SyQuest 44MB drives?

If you haven't got it all sorted yet, I have a couple of SyQuest 44 drives as well.
by Poobah
Fri Mar 07, 2014 2:02 am
Forum: Hardware
Topic: Resurrecting a Mega STE
Replies: 23
Views: 3539

Re: Resurrecting a Mega STE

One other silly thing to check.... make sure there isn't something amiss with the reset button. I've only seen it happen with a couple machines over the years, but it does happen.
by Poobah
Wed Jul 24, 2013 12:39 am
Forum: SuperVidel
Topic: Yeah! SuperVidel arrived today!
Replies: 67
Views: 28835

Re: Yeah! SvperVidel arrived today!

Woohoo, box from Sweden arrived today :D

Now I have to find time to install it, poor Hades is still waiting for me to install mint!
by Poobah
Fri Mar 29, 2013 4:22 am
Forum: Hardware
Topic: ST HDMI Out
Replies: 103
Views: 24015

Re: ST HDMI Out

You'll still need to make some sort of "frame start" signal out of Hsync and Vsync. If you don't, you'll be misaligned, and even if you do get aligned, it will drift. i was using Hsync to count lines, and just ran my output 2 scanlines behind the ST. (tho the overscan Hysnc oddities cause...
by Poobah
Sat Mar 23, 2013 1:39 pm
Forum: Hardware
Topic: ST HDMI Out
Replies: 103
Views: 24015

Re: ST HDMI Out

To be honest once the clock is locked, hsync doesn't matter. In fact I blew the hsync driver on my shifter by not noticing I'd shorted out the vsync and hsync lines, and I can still get a perfectly stable picture (although currently not correctly positioned based on v/hsync). You'll still need to m...
by Poobah
Fri Mar 22, 2013 3:53 pm
Forum: Hardware
Topic: ST HDMI Out
Replies: 103
Views: 24015

Re: ST HDMI Out

Sounds interesting. How are you handling 50/60 Hz and the various overscan tricks? I'm currently just doing 50hz at the moment and overscan tricks are fine as they just change when the display enable is active. This is where I found some issues. Some of the overscan tricks do "bad things' to H...
by Poobah
Sat Mar 09, 2013 10:57 pm
Forum: Hardware
Topic: ST HDMI Out
Replies: 103
Views: 24015

Re: ST HDMI Out

Sounds interesting.
How are you handling 50/60 Hz and the various overscan tricks?
by Poobah
Fri Jan 11, 2013 12:33 am
Forum: Hardware
Topic: DIY: Retro fitting a PicoPSU into a STf/fm/e machine
Replies: 42
Views: 13109

Re: DIY: Retro fitting a PicoPSU into a STf/fm/e machine

I'd have to check the schematics, but the lcd is going to have some power requirements beyond the normal computer... bias voltage for the LCD, inverter for driving the backlight, etc.
by Poobah
Sun Oct 14, 2012 3:44 pm
Forum: Professionals
Topic: TT Rev.J needs repair
Replies: 31
Views: 4530

Re: TT Rev.J needs repair

I've contemplated ripping into the diagnostic cart code to see exactly what it is doing that trips bit 7 error. As simbo notes, it may be a false positive.

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