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Historically, once a Z88 had a Slot 0 flash modification and an OZ upgrade was performed, it could no longer run legacy applications… until now!
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The simplest way to create the file area data is to use OZvm emulator, add a new flash card, format a file area, add the files, eject the card, and choose to save the 16KB banks.
Bundled Tools
With 512KB of flash memory available, we can add software to address many of the shortcomings of early OZ versions:
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Vision2 - a VT100, VT102, VT220, and VT320 terminal emulator. The main reason I embarked on this project.
SpellMaster Spell-Master - a companion to PipeDream which would be very useful to have available at all times, without having to dedicate an entire card to it.
Installer Constraints
Note that to use RAM apps, Installer will require a dedicated RAM card because OZ 4.0 is not capable of detecting applications installed to the RAM portion of a hybrid RAM/flash card, nor in Slot 0 RAM. Installer cannot in fact use hybrid card RAM but, even were it possible, OZ 4.0 would only evaluate the Front DOR at bank $3f (63) at the top of the card (in flash), and that would contain no reference to any RAM app. The newer OZ versions have been modified to also scan bank $1f (31) of hybrid cards (top of RAM).
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Vision's code binds its ROM banks using static addressing which fails when not running from a 32KB Eprom. Furthermore it can only run in card slots 2 or 3. It needed to have this fixed prior to inclusion in this ROM image:Vision2 Fix Patch
Likewise SpellMaster Spell-Master has two banks of ROM code but it somewhat unconventionally pages in six more banks of dictionary data. It uses static bank addressing (relative only to the current card slot) which also needed to be converted to fully relative addressing prior to inclusion: SpellMaster Spell-Master Fix Patches
XY-Modem was able to fit within some unused space in the top bank of SpellMasterSpell-Master, but it needed to be recompiled with a new org address to achieve this.
Flashing the ROM
Note |
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This ROM image is intended for an internal 512KB flash memory modification. It is confirmed working on a real Z88. Proceed at own risk! |
ROM image for OZvm emulator:
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Downgrade files:
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OZ version | Downgrade Method | Notes |
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5.0 | Index | None |
4.7.1 | Index | The screen may occasionally stay off after the write to flash and the Z88 may not reset automatically. |
< 4.7.1 |
(the Z88 application version of RomUpdate does not work here) | Copy both romupdate.bas and romupdate.crc to RAM. |
Downgrade ROM Manifest
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CFG.V3 ; OZ ROM for slot 0 and total of 24 banks to update. OZ.0,24 ; Bank file, CRC, destination bank in slot 0. "ozs0-400.32",$9de67a39,$00 "ozs0-400.33",$1d32d297,$01 "ozs0-400.34",$65ed5623,$02 "ozs0-400.35",$e2e022c6,$03 "ozs0-400.36",$8758704a,$04 "ozs0-400.37",$b860cf23,$05 "ozs0-400.38",$d3104e3f,$06 "ozs0-400.39",$5c5de229,$07 "eazylnk-524.40",$9732f962,$08 "flashst-198.41",$cfa6c666,$09 "spell.42",$96ee9077,$0a "spell.43",$05f85bc3,$0b "spell.44",$ff58c545,$0c "spell.45",$ebfef5c3,$0d "spell.46",$f3badaf9,$0e "spell.47",$3a7c540b,$0f "spell.48",$853282d3,$10 "spell-xymdm.49",$c84cab67,$11 "vision2-206.50",$eca18d37,$12 "vision2-206.51",$7cbc18ea,$13 "file-area.52",$7c344d49,$14 "file-area.53",$ffdd48b4,$15 "file-area.54",$4a2d56c7,$16 "ozs0-400.63",$ffce2400$d5daddb3,$1f |