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#1 2014-07-03 20:56:54

uniserver
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From: Sf, Mi
Registered: 2014-05-15
Posts: 956
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Your Favorite PPC/68k Mac to Modify.

What are some of your Favorite Mac's to modify?

Some are Super Easy to modify, Some are more difficult with only little gain.

For an example of some of my favorites:

- LC-III 25mhz to 33mhz, changing just one 000 ohm Resistor.
- P475 / LC475 / Q605 040 Overclock to 33mhz from 25mhz by changing the orientation of just 2 resistors.

- Power Macintosh 6100 60/66 mhz,  Overclocks up there by just changing the crystal
70 / 80 /90-5(ish)  Mhz,  that is a fairly substantial increase in speed!
- please install a CPU fan!
a_papst_60mm_fan_612f_16dba_lg_pic.jpg

and on the flip side.

The IIsi,  you can overclock from 20 to 25mhz.   Go past 25mhz though and your
PDS NIC will probably stop working
Nubus Adaptor will probably stop working as well past 25mhz.

If you do not have anything connected to the PDS slot.  Then you can run it to 29mhz.
and the only thing you might loose is the ability to boot from the floppy drive… other wise the floppy will still work once booted up from the HD.

Also the IIsi… it only has 1mb of ram onboard.
you can remove that 1mb of ram and install 4megs of ram from a LC-II or LC-III or any other dead mac board you might have laying around that has 4mb of ram onboard across 8 chips.

— If you do upgrade the onboard ram in your IIsi, from one Meg to 4megs… You will notice better video performance and you will automatically have another higher resolution available, (640x480) even w/o the nubus adaptor installed:

*Onboard video is capable of supporting a maximum resolution of 640x480. If the optional NuBus adapter card is installed

Last edited by uniserver (2014-07-03 21:09:50)


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#2 2014-07-03 23:14:32

jt
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From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,470

Re: Your Favorite PPC/68k Mac to Modify.

Now that bit of info I haven't run across and it's very interesting, the only thing the NuBus adapter adds to the mix hardware-wise it the soldered Math CoPro.

Have you got a loose CoPro and PDS adapter or card to throw it into to test with your 4MB, 640x480 Vampire Video abatement program?

I'll have to think about my answer, it used to be anything Duo 2300c related for modding and 6400/6500 re-casing for the appearance abatement issues, but the IIsi has really kept the cogs in the noggin' spinning of late.

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#3 2014-07-04 19:48:17

uniserver
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From: Sf, Mi
Registered: 2014-05-15
Posts: 956
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Re: Your Favorite PPC/68k Mac to Modify.

yes i have a few Nubus adaptors,  i re-capped them.  did you need one?  maybe we can do a trade or something.


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#4 2014-07-05 01:19:33

jt
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From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,470

Re: Your Favorite PPC/68k Mac to Modify.

Nah, I've had two or three of them on hand for a couple of projects that date back to the heydey of 'fritter and the 68kMLA. I never wanted or had a IIsi until relatively recently.

Now if you've got one for the 6100, we can give wheeling and dealing another go. wink

I'm curious to see if either the RCPII/IIsi or the passive SuperMac Adapter with the 68882 socket populated would give you the same results for enhanced video with 4 on the floor (MB) as does the NuBus Adapter?

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#5 2014-07-05 06:30:11

uniserver
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From: Sf, Mi
Registered: 2014-05-15
Posts: 956
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Re: Your Favorite PPC/68k Mac to Modify.

Ah good question.. i am not sure why you would need the passive supermac adaptor though.  the RCPII has an FPU slot,  at least i thought it did... :-P


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#6 2014-07-05 06:30:41

uniserver
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From: Sf, Mi
Registered: 2014-05-15
Posts: 956
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Re: Your Favorite PPC/68k Mac to Modify.

lol 4 on the floor


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#7 2014-07-05 14:16:26

jt
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From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,470

Re: Your Favorite PPC/68k Mac to Modify.

Yep, your RCPII/IIsi/SE/30/stubbin may still have remnants of the socket, but do you have another one that you haven't chainsawed?

The passive adapter only has the FPU Socket, plonk a 68882 in there, testing in that configuration would be the definitive test to determine if your stick-shifted IIsi only needs the FPU in order to max out the 640x480 res.

You have to do the test, my IIsi will likely have one or none on the floor until two other experimental hacks have been tested. It's good to know that I have the IIsi - four on the floor - Memory Injection Hack* as a fallback if the sub-basement RCP/II/IIsi doesn't work with the NuBus Adapter/Rocket in the slot.

Great work, uni, you need to post a hack thread about that one, jailbreaking the IIsi's Vampire Video limitations to the extent that you have is a major achievement!




* Title suggestion. wink

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#8 2014-07-05 21:56:35

uniserver
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From: Sf, Mi
Registered: 2014-05-15
Posts: 956
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Re: Your Favorite PPC/68k Mac to Modify.

Thanks jt, but honestly if it wasn't for you.  there probably wouldn't of been any projects from me.

Your hacks inspired me.   :-)

if i get sometime i can test this.


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#9 2014-07-06 08:52:03

LCGuy
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From: Sydney, Australia
Registered: 2014-05-13
Posts: 855

Re: Your Favorite PPC/68k Mac to Modify.

Question is though - if a IIsi with 4MB onboard has four on the floor.....does that mean that a Classic with a memory expansion card with both slots populated has "3 on the tree"? big_smile Was just a thought.

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#10 2014-07-06 14:08:44

uniserver
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From: Sf, Mi
Registered: 2014-05-15
Posts: 956
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Re: Your Favorite PPC/68k Mac to Modify.

i would say YES!  haha


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#11 2014-07-06 14:27:47

jt
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From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,470

Re: Your Favorite PPC/68k Mac to Modify.

Minivan RAM injection system? :-b

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#12 2014-07-06 15:05:16

jt
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From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,470

Re: Your Favorite PPC/68k Mac to Modify.

Thanks, uni, I've been inspired by many hackers's achievements.

Do that final test and you'll likely have inspired bbraun to take a look at the reasons why an FPU gives better results from the Vampire Video Subsystem. If it should turn out to be the Declaration ROM/FPU combo or only the DeclROM itself and he'll likely be chomping at the bit to find out what's going on.

I just wish I had the patience and attention span to finish more (some?) of my hacks. For me, hacking (as in much of life and learning) is more about the journey than the results. Concept testing a WAG about the workings inside or re-sculpting the exterior just to rough out the model in my head to see how it looks IRL and show that maquette to others is usually enough for me.

So it goes  .  .  .




BTW, where did you find that quote? Methinks I may have discovered 640x480 by chance testing the Rocketized IIsi, but missed the difference and its significance.

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#13 2014-07-06 17:34:03

uniserver
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From: Sf, Mi
Registered: 2014-05-15
Posts: 956
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Re: Your Favorite PPC/68k Mac to Modify.

ok when i get some time i will check it out.

it was everymac pretty sure.


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#14 2015-01-06 21:25:03

Dnal
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Registered: 2015-01-03
Posts: 59

Re: Your Favorite PPC/68k Mac to Modify.

Sorry to revive an old thread, but am interested in the 6100 hack.  I used to refurb/sell old macs on FleaBay, but never modded any.  Just got the bug to revive my first Mac (LCII) that I did accelerate with a Sonnet BudgetBooster (25Mhz and an FPU).

So any recommendations the CO I would need to mod my 6100/60AV?  I am thinking of pushing it to 80Mz.  But was looking at a G3 upgrade for it... not sure it is worth doing that.

D

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#15 2015-01-07 03:47:36

uniserver
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From: Sf, Mi
Registered: 2014-05-15
Posts: 956
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Re: Your Favorite PPC/68k Mac to Modify.

i got mine to 90mhz,  but a g3 upgrade might be kinda nice.
all you have to do is change the oscillator.


#I Re-Cap √Mac √NeTX √Amiga Boards - A/B - PSU# (MacCaps.com)  Modern SCSI HD's - For Old Macs - Pre Cfg'd - 10k RPM! 73gb!! $50 + free shipping  -- Mac 128K Re-Ram kits (16 Chips) $35 + shipping, Floppy Issues?-> Bourns Filter Solution 128k - SE/30, $16 + shipping

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#16 2015-01-07 06:30:44

volvo242gt
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From: Duvall, WA
Registered: 2014-05-22
Posts: 410
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Re: Your Favorite PPC/68k Mac to Modify.

Centris 650...  Pop out the 25MHz '040, and pop in a 33.  It will still say Centris 650, but will be a little bit snappier, since it's now as fast as a Quadra 650 or 800.  One weird thing I've noticed...  If you use an 800 board in a 650, it will identify itself as either a Centris 650 or a Quadra 650, depending on which processor you use on the board.  Think there might be an extra pin on the LED connector that tells the board that it's in an 800 case and to provide the correct model information when running System 7.1.x (or 7.5.x with Mac Identifier).

-J


modern: Mac Pro 2.8GHz 8-core 6GB/500G/DVD-RW, Mid-2010 A1286 MBP
PPC: G3/400
Pre-Mac: //e
other: iPhone 6s 128GB Space Gray

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#17 2015-01-07 07:30:37

bbraun
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Registered: 2014-05-29
Posts: 1,064
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Re: Your Favorite PPC/68k Mac to Modify.

Plus you can pop a ROM SIMM in those and get more jiggabytes.

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#18 2015-01-07 11:03:22

LCGuy
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From: Sydney, Australia
Registered: 2014-05-13
Posts: 855

Re: Your Favorite PPC/68k Mac to Modify.

LC475. Quadra power in an LC shell. They can take a full meg of VRAM (allowing 16 bit colour at 832x624 or 8 bit colour at up to 1152x870), take up to 132MB of RAM, be OC'd to 33 Mhz, and I believe its even possible to solder a ROM SIMM slot onto them. And all this is on a teeny tiny logic board that if you wanted to, you could stick into anything.

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#19 2015-01-07 16:49:50

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,470

Re: Your Favorite PPC/68k Mac to Modify.

Yep, you can add one, but earlier production batches(assumption) came with the ROM SIMM slot as a factory installed ROM swap fixer-upper.

Adding NuBus to the Quadra 605 was probably the first of my impossible dream hacks. It would have been an "over the top" expansion of the bridged LCIII_PDS of the 475/605 implemented in the lower section an LCD "upgraded" DOA Portrait Display's shell. A donor still hasn't turned up so I've gone in the opposite direction with an inverted Sub-Basement Expansion hack and a bi-directional Basement Expansion hack-in-progress.

The never-really-wanted-one MehMac IIsi, SE/30's Bane SuperIIsi™ hack has segued into the madness that is Project30.

LC, if you'd like to try your hand at an "impossible dream" hack for your 475, drop me a line. Mum's the word otherwise. wink

Last edited by jt (2015-01-07 16:54:28)

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#20 2015-02-01 19:53:22

Scott Baret
Member
Registered: 2014-05-21
Posts: 184

Re: Your Favorite PPC/68k Mac to Modify.

Hmm..favorites to modify...how about a loaded SE with two floppy drives and two hard drives? It's possible!!!

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#21 2015-02-02 23:00:38

techknight
Member
Registered: 2014-05-22
Posts: 453

Re: Your Favorite PPC/68k Mac to Modify.

I like modifying the power LEDs on machines from green to blue.

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