After a lot of poking about to understand the code, and to get a grip of Z80 ASM in general, I have managed to back port the improved flash memory support from OZ 5.0 to the Z88 standard library:
https://bitbucket.org/cambridge/z88/pull-requests/1
Z88 Flash EPROM support was substantially improved in 2018 when support for many new device types was added to OZ 5.0 and to OZ 4.7.1.
Unfortunately applications dependent on the standard library were excluded from these improvements, in particular:
- RomUpdate - for writing and updating card applications, and essential for upgrading an unmodified Z88 to a modern OZ version
- RomCombiner - for combining card applications onto a single card
- FlashStore - for file backups/restores to and from RAM
- FlashTest - for diagnosing flash card hardware
This had become problematic since the obsolescence of AMD AM29Fx flash chips. New cards sold by Rakewell are now SST type.
- EazyLink Standalone - for reliable serial file transfers to/from a Z88 running an older OZ ROM
I attach new builds of those tools. This version of Romupdate will allow even an unmodified Z88 running OZ 3.0 to write a newer version of OZ to any flashcard from the supported list:
Code: Select all
+----------+-------------+-----------+-------------+---------------+
| | 512KB | 1MB | Write | Compatibility |
+----------+-------------+-----------+-------------+---------------+
| Intel | | I28F008SA | Slot 3 only | Intel |
| Intel | I28F004S5 | | All slots | Intel |
| Intel | | I28F008S5 | All slots | Intel |
| AMD | AM29F040B | AM29F080B | All slots | AMD (AM29F) |
| AMIC | AMIC29F040B | | All slots | AMD (AM29F) |
| AMIC | AMIC29L040 | | All slots | AMD (AM29F) |
| Eon | EN29LV040A | | All slots | AMD (AM29F) |
| Macronix | MX29F040C | | All slots | AMD (AM29F) |
| ST | ST29F040B | ST29F080D | All slots | AMD (AM29F) |
| SST | SST39SF040 | | All slots | SST (SST39SF) |
+----------+-------------+-----------+-------------+---------------+
