cwwj@ur-tut (Clarence Wilkerson) (05/19/88)
Has any one done this? I do not yet have a TM100, so I don't know how the extended address and i/o works for sure. The board has a control port at FC40H and the 64k o memory can be mapped into any bank of the 24 bit address space. I have some software that will load it, etc that works with it on another s100 system, so my first problem is how to get to the control ports, etc. Thanks, Clarence Wilkerson .
GUBBINS@RADC-TOPS20.ARPA (Gern) (05/24/88)
It would be very interesting to try. A cheaper solution appeared in either REMark or Sextant where a person replaced the Z-100 8085 with a Hitachi Z-80 superset chip and a small kludge board it fit in. The TM-100 is quite large, but I have been thinking about slowly feeding it into the OCR for everyone. I am going to consult ZDS/Heath about their copyrights on it, as I don't think they really care about providing it anymore. The Z-100 reserves I/O addresses 128-255 for the Z-100, floppy, winnie, 256K RAM board, NETcard, secondary floppy, winnie controllers, etc. Any address 0-127 is okay, unless you are using a PC emulator board, then it is a guess. Also note that the I/O decode only looks at the LSByte of the address, so the Z-100 ports roll over in the address space every 256 addresses. Cheers, Gern -------
cww@MATHVAX.MSI.CORNELL.EDU (Clarence Wilkerson) (05/24/88)
Does the z100 put out honest 24bit addresses for memory? The rollover on the io addresses could be a problem since the SPUZ board decodes and uses 16 bit io addresses. However, if the low order byte does not conflict with z100 board use, I may be able to jury rig the select line. I got the board from a friend for free, so this should be less of a problem than putting in a z80 superchip, unless some one has that well documented and with board plans ready to go. One point was that the spuz can operate independently of the z100 once it is going, so one could have multiprocessing of sorts. My understanding of the z100 is far from complete, but it seemed that either the 8088 or the 8085 was running memory, but not both together. Thanks for the help, Clarence
ahd@OMNIGATE.CLARKSON.EDU (MESSAGE AGENT) (05/24/88)
This is an automatic reply. Feel free to send additional mail, as only this one notice will be generated. The following is a prerecorded message, sent for ahd 27 November 1987 I don't know what to say in this, my last note from Buffalo, New York. Good and bad things have happened to me since the end of October that defy description, and the only people who would believe me already have enough stories to tell about me without creating new legends. The people who made the good things happen know who they are, and as for the bad things... I prefer to lump them together as acts of God and leave it at that. However, the end result of those past four weeks is that I now have survived my first week working for AGS Information Services on site at IBM Kingston preparing to change software that I'm not allowed to discuss, I enjoy the work, and I expect it to last a while. I also have found an apartment in Kingston, and will be tearing down my computer to be moved there as soon as I log off. My new address as of 1 December 1987 is: Andrew H. Derbyshire 578 Broadway, Apt 6 Kingston, NY 12401 My telephone will be hooked up on 4 December, and the number will be: 914-339-7425 Note that use of either of these is better than sending me mail on omnigate, because now that I am working I intend on letting my online mail exchanges die a natural death and use real world communications instead. This advice applies to answering this letter, so please send me a holiday greeting at 578 Broadway instead of answering this online. Most of all though, don't be a stranger. Drew
GUBBINS@RADC-TOPS20.ARPA (Gern) (05/26/88)
The 8088 in the Z-100 uses only 20 address lines A0-A19 of the S-100 bus. The top 4 (A20-A23) are held by the High-Order-Address-Latch which is a Port (init set to zero). This effectively banks 16 1Mbyte address spaces for the 8088. The 8085 latches A16-A23 as well if operating. To my knowledge, this port has never been put to use with either processor. The S-100 bus, the DMA of the Z-100 Winnie, and the NETcard, all are 24-bit masters (TMA). The latch port tri-states for TMA (Temporary Master Access - 696 lingo for DMA/DIA (direct I/O access)). Gern -------