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Equivalent in this case means that CSII has the same number of interrupt connections to OHare as Slot_B, just like every other PCI device connected to OHare. Equivalent doesn't mean that CSII and Slot_B uses the same interrupt. All PCI devices connected to OHare have a separate interrupt input...

Is the riser that is the same for Alchemy and Gazelle a two slot riser or a three slot riser? That C600 UMAX Riser is not the same as the Apple Alchemy and Gazelle riser as it has a non-PCI connection with many more pins to accomodate the third slot and a comm slot. I suppose any riser with...

U23 is the chip on Alchemy. You want U20 on Gazelle. Or am I confused about what machine the goal of these threads are for? We don't have Alchemy schematics. U20 is used for doing GNT for 4 of the 5 PCI slots/devices from OHare (page 7-B7). U20 is a 74F32 which only has 4 OR gates so it can only...

I believe bus masters use REQ and GNT (check the PCI local bus specification). What REQ and GNT lines are you planning to use from OHare for Slot_C? Heathrow for Gossamer appears to have 6 pairs of REQ/GNT lines. A bus master is one that can read and write to the Mac's RAM using DMA or read and...

The schematic for J8 of the 6500 says the reserved pins are for a PCI adapter card. I suppose the PCI adapter card is an Apple specific adapter so it can do weird stuff like requiring reserved pins to handle separate interrupts. Where's the schematic for the riser (PCI adapter card?)? Are you...

Every slot has 4 interrupt pins A,B,C,D. These may be reordered per slot. Usually a PCI card uses int A. Int A may be connected to int A or B or C or D on the motherboard or riser because of the reordering. A multifunction card may use more of the interrupt pins (A,B,C,D). None of that matters...

All bridges have the same access. I don't have a ROM with Open Firmware code that mentions a bridge 3. Maybe it exists in an Apple Network Server? Or some kind of prototype machine? Bridge 0 is usually @F000000 Bridge 1 is usually @F200000 Bridge 2 is usually @F400000 Bridge 3 is usually @F600000

Apple II question: Does it draw even and odd fields of an NTSC frame? Can VBL be detected? If yes to both, then wouldn't it be possible to create a 280x384 interlaced mode by switching between HGR and HGR2 at 60Hz? Then you could have a 560x384 mode by switching between DHGR page 1 and DHGR...

Did you check the Apple Developer Discs? Maybe 1995 Reference Library discs: https://archive.org/download/Apple_Developer_Discs_1989-2009/1995/Reference%20Library/

The Apple //jse GL Renderer seems to do color fringing more accurately than Virtual ][ (at least according to my expectations for my test image A - the pink and aqua columns on the right side are mostly a single color).

I tried A2D using Apple //jse. I don't think A2D supports loading lores or double lores images? A2D loads HR as DHGR. You can tell by moving the mouse which makes the cursor visible. The cursor is definitely using DHR pixels. The HGR image is loaded into the main column of DHGR immediately. You...

A2D is interesting. Does it load everything as DHGR or does it switch graphics mode to match the input file? Certainly DHGR can display anything that GR, DGR, and HGR can since it allows explicit control over all 560 horizontal displayable bits and you shouldn't be able to tell the difference...

Current versions of DiskWarrior don't preserve the HFS Wrapper of old HFS+ partitions that you might use with a Power Mac.

MONO is meant to be a 280x192 black & white image instead of 140x192 color image. The MONO and HGR and DHR examples are using a naive bits to color conversion method which is not what real hardware would do. A single 25% brightness DHGR pixel should be half the width of a HGR color pixel and a...

Does opening the file twice give an error or the same fsRef number or a different fsRef?

Each paramblock should have it's own flag - you can make it part of a metaparamblock which can hold other info about the queued I/O such as timer info or whatever. Does PBReadForkAsync return an error as the function result? I mean, does it return noErr all the time? I wonder if the second...

Why not set a completion routine in the parameter block, then use that to set a flag or to fixup ioResult? Your wait loop is not waiting for a specific time period - it depends on how fast it can printf 10 times. I don't see where you kill the I/O when it's taking too long. Then you reuse that...

How bricked is it? Do you have a PC or Intel Mac that can run DOS or Windows? nvflash.v5.95.0.1-win can work in Windows. Which Mac ROM did you try? Do you have the original PC ROM? Did you copy the soft straps and memory info from the PC ROM to the Mac ROM? Does the Quadro FX 4500 have 256 MB or...

This comment: //WR4 = register pointer set to WR4 should be: //WR0 = register pointer set to WR4

Other thread: https://68kmla.org/bb/index.php?threads/transformers-for-homemade-localtalk-phonenet-dongles.47052 Go to https://developer.apple.com/library/archive/navigation/#section=Platforms&topic=macOS Search for Serial. Read all the info. TN1018 mentions MIDI but I don't think SE/30 has the...