Recent content by frontein1

Yep double edged sword here :) Needing no drivers is great, but the embedded ROM on the Booster patches ROM area after the end of the logical ROM. On custom SIMMs with a ROM Disk, this creates a collision between the ROM Disk and the area the Booster is using at runtime. I think this might be...

Has anyone been able to determine if there is a newer ROM available for the Interware Booster 40? Mine has v1.1.2, and I haven't been able to find a newer ROM. If there is, I'd like to compare it and see what was patched. As a reference I have attached the dump from this chip. My card is a...

What might be super cool but also super useless, but more cool than useless..... Put in a BlueSCSI and connect the MacPlus to WiFi or a mobile hotspot on the train. Then pull up frogfind or 68k.news. Sort of reminds me of that old PowerBook commercial, about the 'first in-flight computer...

OK let's give this one a run. 🤞

Right checksum for the IIsi. Also I think those two additional DM's show the right patches to bypass the memory testing. So....... Not quite sure why the cold boot with this ROM = the cold boot with your onboard IIcx ROM. Nothing odd plugged in, accelerator cards, invalid PRAM, etc etc?

A One ROM type would be an ideal EEPROM for this. Without the header pins they might even fit just fine being soldered down. But I am not sure we will ever see one with enough pins. Just about ready. I think the 2MB disk is good to go with a clean desktop file. But I am going to burn it onto...

Is it easy for you to install a program like TattleTech? Under General you can scroll down to the ROM section and get some really useful info like ROM Checksum and ROM Start. https://macintoshgarden.org/apps/tattletech Also 0x02AE is the ROM base global. So you could DM 2AE to see what that...

Well that is interesting, and at least not what I expected. Do a DM 40000000. Let's see what the first 4 bytes (ie checksum) is for the ROM. (Or check TattleTech or something similar to get the checksum that way)

OK and I have a confession to make @croissantking :) I read your other post about the ROM base being 4000 0000 in the 550c. And when I first put the custom ROM together, I incorrectly assumed that the ROM base was the same as the earlier Quadra models (4080 0000). So assuredly this was also...

@luRaichu, DM 400467E0 and then DM 400468F8 from the debugger (MacsBug or MicroBug). You'll want to use these addresses that start with 400 instead of 408. Let's at least confirm that the first 2 bytes of each display the patched 4ED6 bytes.

Well test failed. At least, cannot boot a Q605 using either the 540c or 550c ROM. Might have to wait until this weekend, but I will give it a try on my Q840av as well. In the meantime, I did confirm that the v0.90 driver works OK on my Q605, but only on the disk without the embedded SCSI...

Through debugger, do a DM 408467E0. And also a DM 408468F8. Share the output here. The first two bytes of each should be 4ED6. (Is the ROM base 4000 0000 or 4080 0000 on the IIsi, I can't remember?)

Yes I was wondering this too. Can we boot a Quadra with the 550c ROM, essentially how 'universal' is that ROM? Q605 or Q840av might be good candidates to try. I'll give this a whirl.

Yes 100%. As long as the IIsi ROM was patched correctly, the memory test should be skipped on the IIcx.

Probably a small consideration, but there should be a ROM select jumper on the board. Did you remove that jumper when you installed the ROM SIMM?