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flashjazzcat

Member Since 23 Nov 2008
OFFLINE Last Active Today, 1:51 PM

Topics I've Started

XEGS ROM Geometry

Thu Apr 5, 2018 8:26 AM

I've just fixed an XEGS with a bad ROM and MMU, and have got it going temporarily by flashing four copies of the XEGS OS to a 27C128. Naturally it boots straight to the Self-Test, since there's no BASIC or Missile Command. I can't seem to find out what the ROM layout is supposed to be, however, on a 32K chip (i.e., is it BASIC, Missile Command, OS ROM, or OS ROM, Missile Command, BASIC?). Needless to say I've also been unable to locate a complete 32K dump of the XEGS ROM, otherwise I wouldn't be asking how to manually assemble one. :)

 


"HardDrive" Images

Fri Mar 16, 2018 5:24 AM

Minor issues: another user just pointed out to me that a 2,880 sector DD ATR is identified by RespeQt as a "HardDrive" [sic] image. This is a common floppy image size used - for instance - by XF551s with 720K 3.5" mechanisms. I assume the fact that "HardDisk" and "HardDrive" are written as single words is some carry over from prior versions. I also noticed 360K DD ATRs are labelled as "QD Diskettes". Perhaps QD shorthand for DS/DD (although I can find no mention of this terminology elsewhere), but quad-density (512bps) ATRs are verbosely labelled "512 bytes per sector".


Thumbs for YouTube videos with time offset?

Mon Nov 6, 2017 3:59 AM

Tried to post a YouTube video with a time offset (to skip bad audio) but the extra info in the URL seems to suppress the thumbnail. Not a big deal - just throwing it out there. ;)

Spare a spring?

Tue Oct 31, 2017 12:54 PM

I wondered if anyone might be able to help me replace a missing spring on a Mitsumi 800XL keyboard? The keyboard is "Type 5" in the 600/800XL Keyboard Variants thread, and I rather like it. Unfortunately efforts to fabricate a replacement spring for the Break key have been unsuccessful. Here's a photo of the required spring:

Attached File  DSCF6930.JPG   436.08KB   19 downloads

Frustratingly, I had a cannibalised example of this keyboard many years ago but rather foolishly threw it away, and later did the same thing with the five console key springs I had kept. If anyone has such a spring spare and doesn't mind parting with it (for a nominal fee, covering postage, etc), a PM would be most welcome!

Thanks in advance.