ROM Images
Three sets of ROM images are currently available
Name |
Roms |
IC Description |
|---|---|---|
JDC |
IC25 - IC32 |
From danish vendor JDC |
IWS |
IC25 - IC29, IC31, IC32 |
From a model with serial number 820 |
Hybrid |
IC25 - IC27, IC31, IC32 |
Mix of ROMs from serial numbers 615 and 580 |
Since I have mainly worked with the JDC ROMs, these are the only ones that have annotation data in their program structures.
Memory
The ROS User’s Manual, figure 1 on page 5, shows the memory layout.
For the JDC ROM image some of this information seems correct, but the address range 0x1000 to 0x17ff is marked as unused. However there is assembler code in this region seemingly related to disk reads.