Steve's H5 A3.14 Build (Chicken Pie edition)

[exxos]

Are thoser 2 resistors next to the 1772 1k or 470R ?

Edit:

Sounds like the problem I had when the side0 thing wasn't done https://www.exxosforum.co.uk/forum/viewt ... =30#p52087

Or did you solder the lugs on the db19 as it could short out the side0 select I guess either way, it sounds like the same problem.

[Steve]

Both resistors are 470ohm, lugs on DB19, the ACSI port? My lugs *are* soldered... should I de-solder them? Sorry I missed this

[exxos]

My lugs *are* soldered... should I de-solder them? Sorry I missed this

I would meter out that side0 line, Sounds like it is shorted to gnd (I assume the solder filled the hole completely and shorted the lug to the exposed internal trace) .

You may want to scope out the behaviour of that signal on a working machine then to your problem board so you can see what the differences. I assume side zero is the problem.

[Steve]

@exxos thank you my friend, it was exactly as you said. I only put a touch of solder on that lug but yes it had re-grounded my previously cut track in that db19 hole. I pulled out my Dremel and filed away all the gold on the inside of the lug hole and then the continuity was broken again (as it should be) just tested and now my H5 is 100% for the first time finally I can start playing with it and having some fun

Thx again,

PXL_20220120_113205577.jpg (370.82 KiB) Viewed 3952 times

[Steve]

PS does Blitter become disabled in 030 mode? I just noticed it's greyed out with the tf536 in. Emutos 1.1.1.

[PhilC]

[DoG]

Blitter is pretty pointless when 68030 is running in 50MHz (over 32MHz) anyway. Since it outperform the blitter in those speeds.

[Steve]

Ah yes, I checked in sysinfo and it says 'Blitter available and off'.

[JezC]

Well done @Steve !

This might provoke me to investigate and fix the floppy drive issue on my H5 C...

I'll be interested to see how you get on with your TF536...I still need to update the f/w in mine to enable the IDE ...

[Badwolf]

PS does Blitter become disabled in 030 mode? I just noticed it's greyed out with the tf536 in. Emutos 1.1.1.

EmuTOS turns off the blitter if it detects Alt (TT) RAM as the two don't mix.

Blitter is pretty pointless when 68030 is running in 50MHz (over 32MHz) anyway. Since it outperform the blitter in those speeds.

I've seen this said a lot and I'm not convinced this is true.

I think this myth came about from the TT not having a blitter. 'Ah, at that speed it doesn't need it'. True, but the TT could access ST-RAM twice as fast as an ST.

With an accelerated ST, whatever the CPU speed, it can only access ST-RAM (ie. the same places the blitter can access) at the same speed as a 68000 at 8MHz can. Therefore wherever the blitter gave a benefit to an 8MHz 68000, it should give the same benefit to an 'n' MHz 68030 on the same motherboard.

In fact, for TOS2.06, I believe Anders has made a program ('blitfix') that selectively enables the blitter when it's possible to use it. Sadly it can't work on the Falcon because of a limitation in TOS, but it would be interesting to see figures with and without it on an ST/536.

BW