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  1. Z

    6100, 7100, 8100, 9150 PDS Connector

    The other day I was itching to make the right angle PDS adapters for my 6100 and 610 but I wasn't sure of the exact dimensions. There seem to be several types and I dunno which dimensions (in terms of where to position the connector on the right angle board) are applicable to which adapters...
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    Cheap USB mouse adapter for 128k/512k/Plus?

    This guy sells one: https://www.tinkerboy.xyz/product/tinkerboy-usb-mouse-to-mac-converter-adapter-for-macintosh-with-db9-mouse-port/ Not too expensive and the case design is quite professional! Nobody seems to be talking about it; the designer posted on AppleFritter several times, but last I...
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    Help with LCII Repair

    It’s complicated...I puzzled it out a bit more. The LC II has no less than four signals called reset. Two “power-on reset” signals are generated by U12, which is an MC34064 “undervoltage detection chip.” U12’s function is to pulse those reset signals when the power is turned on or recovers from...
  4. Z

    Help with LCII Repair

    Wow! I did not know this. I thought it would not be possible to dump it from the Mac. Maybe the Egret is the same as one of these 6805 MCUs, and if so, we could burn another: http://www.bitsavers.org/components/motorola/6805/Single_Chip_Microcontrollers.pdf The Egret has 28 pins and evidently...
  5. Z

    Help with LCII Repair

    The system runs when reset is high (above 2.0 V) and doesn't run when reset is low (below 0.8 V). When the computer powers on, reset should be low, but then it should go high and that in turn causes the processor to work, startup chime, etc. So if it's always low or going back and forth, the...
  6. Z

    Help with LCII Repair

    Looking at the schematic briefly, it seems that U10 6805 microcontroller drives the system reset low, since the physical reset button on the LC II is hooked up to the 6805's reset input. I would check if the system reset (available on the PDS slot) is ever going high with a multimeter or...
  7. Z

    Made ROM SIMMs, wrote ROMdisk driver, need help debugging

    Good news! The 8MB SIMM works! Thanks to all of the testers for their diligent work on the 2 MB SIMM! @JDW uncovered a significant defect in the 2 MB SIMM which is possibly the reason it didn’t work in his SE/30. Fortunately the 8 MB SIMM doesn’t have this issue, so hopefully that will fix...
  8. Z

    IIgs users with IIgs-aware DMA cards: we need your help!

    Thanks! What I mean is a little different than what you’re saying though. I’m talking about when an application has a DMA disk card read into an a buffer owned by the app. This buffer will often be in expansion RAM. So for a read operation that moves a disk block from the card into an...
  9. Z

    Made ROM SIMMs, wrote ROMdisk driver, need help debugging

    Oops, didn't see the posts on page 4 earlier when I replied... Ooh, I will look into MindExpander, including just personally. Hm yes, I would like to, but BareBones still exists so I will have to ask them. Hopefully they agree. Unfortunately it's still ~600 kB, which is a lot heavier than...
  10. Z

    IIgs users with IIgs-aware DMA cards: we need your help!

    Hi everyone, My friend Garrett Fellers and I design, manufacture, and sell vintage hardware through his Garrett's Workshop brand. One of our products that's been out for a while is our GW4201-series "RAM2GS" RAM expansion card for Apple IIgs. (eBay...
  11. Z

    Made ROM SIMMs, wrote ROMdisk driver, need help debugging

    Sorry for my absence--please check your PMs. Yes, it should have been programmed when sent to you, but a mixup could have happened. I am not sure if the programmer can program my ROM SIMM, but it can certainly read it out (if indeed it originally supported that feature). The ROM is here, named...
  12. Z

    Getting started with application development for System 6/7

    The memory manager only moves memory when you make a call to allocate a pointer or handle, or when you call a (toolbox) routine which does the same. Memory never gets moved at interrupt time, so it’s not like you can be going through the code and all of a sudden the memory you were using has...
  13. Z

    Made ROM SIMMs, wrote ROMdisk driver, need help debugging

    Yes, but I think it's better to have 6.0.8 on the 2MB and 7/7.1 on the 8MB. The RAM disk (which of course you don't have to use) requires 7.5MB of RAM on the 8MB SIMM but only 1.5MB on the 2MB, so it's sort of fitting that the 6.0.8 version has a smaller RAM requirement to use the RAM disk. Ooh...
  14. Z

    Getting started with application development for System 6/7

    Yes, I believe so, but you have to break it up into its own function like so: asm void foo() { ... }
  15. Z

    Getting started with application development for System 6/7

    For the record, CodeWarrior 6 works quite well on my unaccelerated SE/30, and I recently used it to develop the control panel for my ROM disk. My impression is that CodeWarrior is basically a THINK C clone but the compiler is a bit more modern. Only issue was that I had to hook up a SCSI CD-ROM...
  16. Z

    ‘020 and ‘030 accelerators for 68000 Macs—what’s the memory map?

    Wow, that’s interesting about the virtual memory manager. I didn’t realize it did that. But what about the need to keep an application’s RAM contiguous? Surely the VMM can’t split an application partition across multiple 1MB chunks—or can it, and then just suffer the resulting fragmentation, as...
  17. Z

    Made ROM SIMMs, wrote ROMdisk driver, need help debugging

    Thanks for the feedback! I'll install 7.1. Now about the CD extension, I generally use FWB CD Toolkit because I can set a massive driver cache size with it, but I think it would be more appropriate to include Apple's CD extension. Now, version 5.3.1 seems to be the right version to use, but this...
  18. Z

    Made ROM SIMMs, wrote ROMdisk driver, need help debugging

    Oh, I forgot to ask in my earlier post: what software should I include on the 8MB SIMM? Currently I have: System 7.0.1 TeachText Lido and PMount Disk First Aid ResEdit HexEdit What else should I include? Is System 7.0 the right choice or should I include 7.1? And can anyone...
  19. Z

    Made ROM SIMMs, wrote ROMdisk driver, need help debugging

    2MB SIMMs are being tested now, and I am so far hearing only good things! 8MB SIMM boards just arrived: I'm waiting on a single part to come and then I can assemble these. Regarding the thickness, I was able to get a few quotes for 1.3mm boards. The best price was around $4 each, which is...
  20. Z

    ‘020 and ‘030 accelerators for 68000 Macs—what’s the memory map?

    As we all know, 68k Mac compacts have a hardware RAM limit of 4MB. However, there exist accelerators (e.g. Radius Accelerator 16) which extend the memory capacity to 16MB using onboard SIMMs. Presumably 8MB of this RAM is accessible in 24-bit mode. So my question is, what’s the typical memory...
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