Jump to content

Trash80toHP_Mini

68040
  • Content Count

    13160
  • Joined

  • Last visited

Everything posted by Trash80toHP_Mini

  1. Trash80toHP_Mini

    Farallon ETHERMAC LC NSC w/NuBus drivers in the SE/30 PDS?

    Here are some pics of the test setup. Thought it best to get it documented before the project crashes and burns. Dunno if this is the first time an LC NIC has been fitted to the SE/30 PDS, but once I've wire wrapped it we'll see what happens. (crosses fingers) I've got a couple of days off to work up the wrap templates. They'll be laser printed, rubber cemented to poster board, cut to fit and then bolted up to to either side of the perf board. One side keyed for wrapping and the other keyed for testing the connections. I'll see if I can get any of the wrapping done before I'm off again next Monday/Tuesday, but not likely. The only component yet to be fitted is the header block on the reverse side so swapping the address jumper can be swapped around without removing the board assembly. edit: decided to go ahead and test the rig in the SE/30 right off the bat to avoid any complications the faster clock of the IIsi might induce. KISS, the less variables the better. One additional question for you boffins: should I keep all the wires the same length (meandering) or is it safe to keep the wrap neat by using length appropriate wires? The card should be running off C16M in the IIsi, but I'm wondering there might be a problem with a IIsi clocked to 25MHz?
  2. Dunno where this one will lead, but gotta give it a shot. So many folks have been asking about the prospects of doing something like this for so many years that it has to be tried. maceffects has placed two of his Farallon NICs into my grubby little paws, so it's time for a bit of olde schoole wire wrapping fun. The 68030 LCIII PDS version of this diagram has been kicking around here and there in different projects for years. This time it's been dumbed down to the bare essentials of its 68020 LC PDS origins: RosettaCache-01-002.PDF The signal known as /SLOTIRQ in the LC docs is better described as /SLOTIRQ.E in the expanded 32-bit 68030 PDS LCIII update of theLC PDS. We've been talking on and off about prospects for using it on an available interrupt on the 68030 PDS of the SE/30 and IIsi. That NMRQ line bit in the signal description makes me wonder if there's another pin on the 030 PDS? /NuBus might work where the /IRQ lines may not? Is the 12V line on the LC PDS to power a FDD on a IIe Card's octopus cable or might the NIC need that voltage as well? Any help with proofing the signal map would be much appreciated. I found one boo-boo, but proofreading your own work is just oxymoronic.
  3. Where better to start: MacChimney, the good, the bad and the ugly!
  4. Trash80toHP_Mini

    Farallon ETHERMAC LC NSC w/NuBus drivers in the SE/30 PDS?

    Yeah, the other one I have here has unimplemented components for ThinNet just like like your Farallon NICs. I'll be buzzing for connections for 12V just out of curiosity, but I'm going ahead and hooking up 12V in any case. At first I thought +12V might only be for powering the FDD on the IIe Card's breakout cable. Transceiver power makes sense. There's no -12V connection on the LC PDS, so no NIC nor any other LC Slot Card have need of it, but you got me curious: -12V is not on the extended LCIII slot either. What the heck uses uses that voltage? Is it for differential signalling? I've got a nice piece of perf board here with copper pads on one side and grid lines for 5x5 contacts on the other. It's thin enough for me to wire wrap the protruding soldertails of connectors I had on hand so all the parts are in place. Had it set up in the chassis unencumbered bench setup for the SE/30 and all looks good. I'll probably make a thin plexi carrier board to bolt the RCPII/IIsi, Farallon NIC and perf board up together for a unitized assembly for installation and as a support base for doing the dirty deed with the wire wrap tool. Tested wrapping the short pin protrusions and there's no problem with a single layer wrap. Should be fun!
  5. Trash80toHP_Mini

    Farallon ETHERMAC LC NSC w/NuBus drivers in the SE/30 PDS?

    Perf-00-000.PDF
  6. Trash80toHP_Mini

    LC 475 discontinued May 1994 but mines made in 1/95 ?

    Long production life of the LC475 was likely related to the K-12 market and IIe Card and existing monitor base compatibility. IIci had a long production lifespan because it was the standard DTP workhorse for feeding piecework to the high end workstations after having already been that high end workstation for quite some time.
  7. Anything interesting or even progress to report from anywhere on this? Volume IV of Inside Macintosh with its "relevant information" arrived today, but the meat of the matter is in the "indispensable" Volume V waiting for me at the rental office for pickup Monday morning.
  8. Trash80toHP_Mini

    Novy Systems accelerator for SE from 1987 at 50MHz?

    That may be why a set of low profile, 256K KeyChain SIMMs will just barely fit under that overhang. I wonder what's required and where on the map? Might the Accelerator be using all of the SIMM capacity on board, but for memory locations dedicated to use as frame buffer on the logic board SIMMs? Makes no sense from the standpoint of some Accelerators woeking with SIMMs located on the Accelerator OR on the logic board though? But that could be the 68030 vs. 68020 implementation thing. I've finally got Inside Macintosh in da house! Too bad it's only Volume IV covering 512ke and Plus. Volume V for SE and Macintosh II should be at the rental office, but can't get there until Monday.
  9. Trash80toHP_Mini

    Building your own case

    Adapting a PC box like one of those at Newegg to fit a NuBus Mac board isn't all that easy because the slot spacing is different than ISA/PCI and physically incompatible. The easiest approach would be to retain the 8100's inner chassis, PSU, the rear bezel with its backplane slots and ports along with the unmodified drive cage section and skin it over with a wood box or the like on top, sides, front and probably the bottom. That would make it a tad larger than original, but what the heck? It'd be a crack resistant, crumble proofed case!
  10. Trash80toHP_Mini

    Building your own case

    My methodology: making rough approximations, breaking the bits down to building blocks in 3D and rattling them around in my head comes easily enough. But I then move right to scaled drawings of the boxes to be folded and rubber cemented together for tactile building block playtime. I start with the exploded diagrams in the service manuals to identify the modules and take measurements of the real deal. there are three things to cast off at first glance. Put an ATX PSU on the end of the power supply cable and that monster all but disappears. Speaker housing is deep sixed right off the bat and the wasted cubic of the silly sled setup goes too. PSU is the major factor in reducing the width (or height?) dimension. I'd keep the Logic board guard as the mounting point, but the bits sticking out into the excised void in the front goes too. NuBus/PDS card box would be mounted to logic board/guard assembly box. a tethered box for the new HPV slot would be the first steps. Drive cage and its orientation are the variables that will define the form factor of the smaller/better PSU. Details like little boxes for RAM/ROM/CPU and other protrusions would be glued to the MoBo box. Anyway, that's how I'd do it.
  11. By far the trangest iteration of MacTilt and its ilk that I've seen. Somebody linked MacWorld 11/87 earlier, that's where tha MacChimney pic was snagged. Same issue has a review of all the various cooling addons.
  12. Yeah but they tout its gentler, dustbin collector eradication of the fan model approach. But soot stains aimed with precision accuracy at the ceiling would rock! Even better, in oil lamp mode with recirculating carbon soot waterfall effects, I wonder how long it would take to burn the Mac's Logic board up and the cardboard chimney right down with it? Here's another bit of strangeness about the thing. They advertise the bare data without revealing its 63.6363636363636363636363636363% airflow enhancement.
  13. Trash80toHP_Mini

    CURRENT most reliable Powerbook?

    Plastics are high on the list of reliability characteristics for me. Blackbirds fail miserably in that regard from what I've seen. But even I would be sorely tempted by a 550c.
  14. Trash80toHP_Mini

    Novy Systems accelerator for SE from 1987 at 50MHz?

    HRMMM? RAM on the Accelerator would be loaded with the video data by the 68020, no? Does the logic board really care whether the frame buffer data it accesses from the same mapped location is physically located on logic board or PDS? I don't recall there being any portion of SE memory buffered expressly for the purpose of video like there is on the IIsi. Just referenced the SE block diagram and it looks like BBU (Custom Gate Array) is fed data from either RAM Data Bus Buffers or SIMMs and RAM Address MUXs before sending the frame buffer data off to the A/B? But there is some hinkiness to be found in the address lines split between RAM Address MUXs and BBU on the CPU/PDS side?
  15. Trash80toHP_Mini

    Novy Systems accelerator for SE from 1987 at 50MHz?

    I'm liking your word choice there! If it overhangs the SIMM slots I can't imagine it would be designed to use memory installed there whatever the profile. The SIMM memory spec cubic wouldn't have been encroached upon. That would be a 68030 card by your description? I don't think many 68030 accelerator comparisons will be applicable. edit: have you tried it with the FPU pulled yet?
  16. Trash80toHP_Mini

    Novy Systems accelerator for SE from 1987 at 50MHz?

    It's tough to erase an EPROM, so that's probably not it. A chip tester might tell that story? What makes me really curious is the way out of spec form factor of that board. I've not seen one exceed the "PDS foot forward" max. board spec. outline. How do you even install SIMMs under that overhang? It almost has to be designed for use without SIMMs on the logic board? Makes a world of sense, no PMMU on the card for using SIMMs on the logic board for anything. They put the standard 4MB of system memory on the 68020's faster bus, avoiding the PDS thruput bottleneck. The Radius cards from the 68020 accelerator generation used the SIMMs on the Logic board and SRAM cache to make up for the slower memory bus. Is there any cache on that board? Crystal would be for the asynchronous FPU and CPU clock would be generated from the PDS clock in the PALs, no? Is there any record of a 68020 accelerator for the SE ever being made that could address more than 4MB? All that I recall having that capability were based on the 68030 with its built in PMMU. 8MB meeting max RAM spec of Portable and PB100 in the SE might be possible, but there could well be memory mapping issues in ROM to prevent that being done? I'd say 4MB in the sockets of the card and none in the four on the floor would be your ticket. Lovin' that funky, low profile,hack friendly standard header connector PDS passthru!
  17. Trash80toHP_Mini

    Building your own case

    Definitely radios and TV. Forgot the date, but FCC succeeded another agency around the time TV hit the airwaves. No health concerns involved. That idiocy cropped up when cell phones were new and scads higher frequencies emitted next to your head had folks in a tizzy about cancer. They strapped the things to the top of pig's heads set on continuous transmission mode for a very long time(TM) and now nobody gives a second thought about doing the same thing with an iPhone all but strapped to their ear. Comb joints are prettier on a smaller scale than dovetails anyway. Integrate thru tenons and pegs on X,Y and Z axes as your internal support structures and you'll have a knockdown comb jointed box. Perfect is the enemy of good. Go for a workmanlike look and imperfections become features. The gaps in those shelf boards would work as nifty cooling vents. I'll have to post a pic of the nasty lookin' yet utterly beautiful little dovetailed box I was making by eye from an ash log out by the woodpile while the relatives were yapping away inside. One day I'll finish it as a memento for the rug rat.
  18. Trash80toHP_Mini

    Building your own case

    Combining 8100 replacement case build and woodworking sounds heavenly. Love that slipperyskip site, impeccable craftsmanship. Maybe a woodworker's tool chest design featuring dovetails and drawers configured as removable drive bay? Lots of reference material for design inspiration, plans and construction methods are available. On the spec front, think outside that horrible plastic boxes' expansion limitations. You can have three open NuBus slots with your HPV card tucked away in a bit of extra cubic. The big metal can of my Radius 81/110 has room for that with card installed on the far side in a "hidden" slot on the floor of the case. As I understand it the mesh approach works fine as shielding. Research the requirements for a Faraday Cage as that's what RFI shielding would be from a technical perspective. Galvanized sheet metal for HVAC ductwork is inexpensive, thin, easily cut/bent/seamed with hand tools that are readily available. I like its look and with clear coat it won't oxidize, remaining attractive even if it's only visible on the inside for you to see the detailing. I can help on that front if you've never done sheet metal work.
  19. Trash80toHP_Mini

    Dual / Multi LC PDS slot

    RosettaCache-01-001.PDF I know it's a bit of a tangent, but I could use help checking the table and definitely about the FC3 situation. TIA jt
  20. Trash80toHP_Mini

    Oh. Great. Another IIsi...

    Amazing!
  21. Trash80toHP_Mini

    Dual / Multi LC PDS slot

    RosettaCache-01-000.PDF
  22. That sounds like a great Idea for a first run at this thing, baby steps. Since we don't need to use Apple's physical design guidelines we could get by with a generic adapter to PDS and smaller form factor carrier dev boards. The mockup above was meant to have a PDS connector on the solder side for an outrigger development board plugged in thru the opening in the SE/30 chassis. Substitute a PCI connector for EuroDIN120 and all carrier revisions remain within the 10x10 SEEED square and are easily swapped out. Header/socket thruholes below the PCI connector would allow breadboarding a first rev "PCI" carrier board for the much shorter edge card connector. Keep the breadboard connector thruholes configured for EuroDIN120 and late model, much larger standalone carrier boards using those more expensive connectors would be handily installed/removed as well. A short run of adapter boards could be used through the entire development process. edit: moving development boards onto 'PCI" was planned for major reduction in cost of development.
  23. That's what I thought I'd said: The DRIVERS for a video card as in "Cards and Drivers" reside in DeclROM to bring the card online, allowing ?Mac machine state indication before disk access for loading the OS begins. Was that a comms error between us or am I missing something here? Whatever "drivers" shipped on disk with the card set it up for special features via extensions a/o a provide a customized Control Panel replacement for the Monitors Control Panel. I found a tidbit about VidCard Driver/INIT loaded at boot's ability to usurp function of the DRIVER in DeclROM to be interesting and possibly a handy development tool. Once a basic setup for implementing that is coded, up and working it might make tweaking DRIVER development possible w/o the need for removing and burning a new ROM for the card with each iteration. Might not be necessary if provision for updating an EEPROM on the development board via USB or the like would be better, Dunno about that stuff, but I thought I'd mention it. The latter would be better in terms of adding/tweaking display mode options in DeclROM, assuming that might not be possible to do from the host Mac?
  24. Trash80toHP_Mini

    MDD G4: $70 a good price?

    I wouldn't say ANYTHING collectible of any sort is of investment quality these days. When cell phones are implanted on the mastoid bone in your skull there'll be little reason to use your head. Bog only know what will happen at that point, we'll be talking "FAKE REALITY!!!!!"
  25. Reading what? MooshBrain mode had me neglecting to say that the "extended documentation" on the Macintosh II Video Card (TOBY?) was in DCaDftMF3e. The screencaps I posted wer from DCaDftMIIaMSE with a reference to dri9ver development in Chapter 9 of same. Took a quick gander at both and it looks to me that all video mode settings are stored in DeclROM along with drivers for anything necessary. The Mac side consists of only the Monitors Control Panel remembering which video mode was last chosen and booting the system into that mode in single bit for Happy/Sad machine state indication before System/Drivers ever begin to load from disk. Presumably with a default setting of 640x480 for any worthwhile card at whatever silly frequency and 60Hz in the case of the proposed new development card. The driver setup for any mode would reside in DeclROM per above with the Monitors Control Panel handling any mode switching. It looks like the only real purpose of coding an INIT for a card is to override whatever resides in DeclROM that may have become obsolescent. This jibes with all my long experience with VidCards, NuBus and PDS. I've never NEEDED to load a driver to get basic function, most of the time at all resolutions/bit depth settings listed as available for any given VidCard. I'm sure a few exceptions have slipped through the cracks in my slowly crumbling mind, but the observation stands as a good rule of thumb. Looking forward to having Volumes IV and V of Inside Macintosh arrive next week to confuse the crap outta me with info on driver coding. < beats head on KBD in frustratiohn > sad;lagjn;lrkg;oaerht;kjearhtk;jwe4ht;iowhaerfo[u3q4['otij34qlktn;qk34th;q3i4io;hg2q34jr'q23jh4rthq
×