68kMLA Classic Interface

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68030 accelerator for the Macintosh Portable, redux.
Posted by: SuperSVGA on 2025-02-18 06:49:56 SE PDS cards run in an expansion chassis for the Portable, whose PDS is ostensibly the same as the SE PDS. I'm not lookin' as I'm a bit burned out with other projects ATM. If one of you guys want to take a look at the Luggable/SE PDS address ranges, finding them identical could be a big step forward I'd think? There's a good chance the expansion chassis likely rewrote address access to PDS cards since the SE and Portable address spaces aren't quite the same. It's hard to say for sure because I've never seen one outside of a picture I have in a magazine. There are some "free" address spaces that overlap between the Portable and SE, but those are in the Portable's upper RAM space, so if you use those you could end up limiting the Portable to 5-6MB of RAM rather than the full 9MB, unless you give the accelerator additional RAM. There are some Portable PDS cards around that do this since having that much RAM was uncommon at the time.
Posted by: MeTheMac on 2025-02-18 19:41:22 RAM would definitely great on-board if it was compatible with the original Apple-branded 1MB, (Kingston, I think) 4MB, and Androda/MacEffects 8MB and 7MB cards. If replaced with a BlueSCSI, would it still need an external PSU? Do we know around how much power the Portable provides, and how much the Accelerator PDS card would take?
Posted by: LaPorta on 2025-02-19 04:53:56 All power is drawn from the battery, so that’s what all that depends on.
Posted by: Trash80toHP_Mini on 2025-02-19 09:08:53 If replaced with a BlueSCSI, would it still need an external PSU? Battery only state vs. battery plugged in/charging state was a concern from the start. Wedging a circuit to hijack power from the battery/charger interface for running in that state, but leaving the accelerator somnolent in a battery only state was another idea as was straight up powering acceleration from a second wall wart plugged in when in charging state. from upthread: I'd figured that power to run an adapted SE Accelerator in the Portable would be harvested from a takeoff on the 12V rail available on the HDD connector. stepped down via Buck Converter. Dunno, at the time I'd figured the 5V rail would be more limited and SCSI2SD replacement of the HDD. Manual switch for low power mode and 68000 specific boot partition option also considered:
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