exxos's Atari, Amiga & retro forum

@PaulJ Cool, thanks.

I'm not quite sure what you are after. 27C400 package is a standard 40 pin DIP and any EPROM datasheet has the pinout e.g. M27C400 for the ST part

The module supports the /BYTE pin for x8 or x16 data just like the EPROM. All the other pins in read mode act the same as an EPROM, /OE, /CS etc

If you're after a CAD library/part file I use Diptrace not Eagle.

I have joined the testing club and have built my three IDE adapters. :D

The TOS ROM I have programmed has TOS 1.04 (IDE patched) and EmuTOS 0.9.12(256k) in the IDE adapter plcc44 socket.

EmuTOS is booting fine and everything is working in my H4 board. However TOS 1.04 (IDE patched using https://github.com/czietz/ideboot/) is booting HD Driver 10.18 fine and C drive icon shows on desktop but I cannot open it and see the contents. Running HD Driver from floppy shows all the partitions on the disk.

Any suggestions on what to check?

@kodak80 , have tried all those boot images except the patched 1.04. I ran 1.04 just to test it with HD driver but didn't spend a lot of time there. Spend most of my cycles on 2.06 and EmuTOS 9.12 which is becoming my favorite boot image. The improved IDE 1.1 foot print and 2.0 mm header pins makes this board a winner in my book.

kodak80 wrote: 01 Apr 2020 22:35 EmuTOS is booting fine and everything is working in my H4 board. However TOS 1.04 (IDE patched using https://github.com/czietz/ideboot/) is booting HD Driver 10.18 fine and C drive icon shows on desktop but I cannot open it and see the contents. Running HD Driver from floppy shows all the partitions on the disk.

Any suggestions on what to check?

How did you partition your IDE drive? How big is the C partition? TOS has several limitation which partition, cluster and sector sizes it can support. (EmuTOS has much fewer restrictions in that regard.)

EDIT: See http://joo.kie.sk/wp-content/uploads/20 ... _Guide.pdf for TOS limits.

czietz wrote: 02 Apr 2020 07:28

kodak80 wrote: 01 Apr 2020 22:35 EmuTOS is booting fine and everything is working in my H4 board. However TOS 1.04 (IDE patched using https://github.com/czietz/ideboot/) is booting HD Driver 10.18 fine and C drive icon shows on desktop but I cannot open it and see the contents. Running HD Driver from floppy shows all the partitions on the disk.

Any suggestions on what to check?

How did you partition your IDE drive? How big is the C partition? TOS has several limitation which partition, cluster and sector sizes it can support. (EmuTOS has much fewer restrictions in that regard.)

EDIT: See http://joo.kie.sk/wp-content/uploads/20 ... _Guide.pdf for TOS limits.

Okay, thank you for the reminder. "Up to 256MB for TOS < 1.04"

My partitions are 1024mb!......I know this but it did not occur to me!

Thank you. Will re-partition my disk and re-test things.

@kodak80 I use 512MB partitions on my drives under TOS 1.04 across hard drives and CF cards. All work very well on both the original beta IDE boards and the V1.1C. I use HDDRIVER 11. I find over about 4GB isn't that helpful on account of the limitations on the number of partitions.

I am intending to patch TOS 1.04 for IDE and will test that too as soon as I get the chance.

Okay, so one of my boards boots fine, the other one seems to not get data from the rom.

All that's in the IDE board at the mo is the cpu. I'm using the motherboard rom which is tos1.04 and boots fine without the ide board in. Which I find bizarre as the cpu is pretty much wired directly albeit through a few sockets.

Its been tested in the H4s but at the moment it's in one of my Megas, simply because I can fault find easier on this machine as I'm more familiar with it.

Everything seems fine except D0 when scoped on pin 5 of the cpu. D0 stays low when all other data and address lines have pulses.

BR BGACK both high, pulses on /AS and DTACK. Both reset and halt are high.

Back to the diagnosis I guess?

Edit:
Well, I can see why D0 is low, its directly connected to ground somewhere on the IDE board. At least I know why now.

Edit 2:

I cut the track from pin5 of the CPU to the U1 and now I don't have any problem with D0. Having a good look round the board for whats likely the 20th time, I can't see anything to ground that shouldn't be, so I'm guessing its a faulty PCB?

At least I can draw a line under the second board episode now :D.

I got the last necessary bits in the mail today and completed my build. So far, everything looks good. I've put a few more comments and a couple of photos in my H4 build thread here.

Hrm, is there some secret to getting TOS 2.06 to boot? I've tried creating a combination 1.04/2.06 image using CartMan (with 256 kB split) and also a straight TOS 2.06, in both cases with the TOS image here, and neither one will boot 2.06, although the former will boot 1.04 if jumpered thusly.

In both cases, I've written the image to a AT27C4096 using XGPro software and a TL866II PLUS programmer, and verified good write. Note that I have near zero experience programming ROMs, so if there's something I missed/messed, I'm not surprised. :)