dougg3 wrote:What happens when you put the jumper in the other position? Does it boot fine from the motherboard ROM no matter whether the jumper is on or off?
olePigeon wrote:My IIci boots with both the Daystar 040 and the SIMM installed when flashed with the default IIci ROM.
olePigeon wrote:Oh! Oh! I just had a wicked thought. OK, I know I said no LEDs on the Jolly Roger... but I couldn't help thinking: what if the LEDs light up when you write to the SIMM? Hehe.
Trash80toHP_Mini wrote: OOPSIE!!!!!!!!!!!!! The base config for the IIsi is NO JUMPER at all!
With the jumper shorting the pins, the IIsi doesn't boot at all.
All right So it's backwards from the IIci.
Excellent! That means the jumper is indeed disabling the IIsi's onboard ROMs. So let me get this straight -- now that you've shorted the jumper pins, the Quadra 650 image works now too? If so, good! We're getting somewhere
olePigeon wrote:Edit: Hat trick! Page 22.
dougg3 wrote:I'm thinking that the Daystar ROM looks specifically for certain Mac ROM checksums to match against the Mac models it supports.
bbraun wrote:I put my disk image onto a floppy and booted with a stock ROM just to check things out. The problem with the System wanting to root off the SCSI drive instead of the floppy it booted from happens even with the normal floppy driver. So, I'm claiming this isn't my bug.
bbraun wrote:But for whatever reason, the cursor vbl task isn't being called.
My code shouldn't be doing anything with VBL or interrupts, so I've definitely got a bug somewhere!
jt wrote:So I've got a pair of bootable ROM SIMMs for my IIsi, one with a MUUUCH more generous memory mapping structure . . .
. . . but, ostensibly, similar PseudoSlot address (3 Slots) limitations.
Now if I were to try a Quadra 950 ROM Image . . .
< . . . scratches head, still wondering how a IIx with a IIsi ROM SIMM on board can handle ALL SIX Nubus slots . . . >
The Macintosh IIsi computer uses a universal ROM that will run on any of the Macintosh II–family computers. At startup, the ROM code determines which hardware features are available on the Macintosh IIsi computer and configures itself to use those features.
Trash80toHP_Mini wrote:The only remaining topics with more posts/pages are the four years longer running:
Trash80toHP_Mini wrote:With those SIP Headers, will it be possible to build a breadboard to program just about any ROM package?
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