trs80: update README

diff --git a/Kernel/platform-trs80/README b/Kernel/platform-trs80/README
index 165f2c2..6234f4e 100644 (file)
--- a/Kernel/platform-trs80/README
+++ b/Kernel/platform-trs80/README
@@ -12,12 +12,15 @@ Emulator Bugs:
        PC -= 2". FUZIX doesn't do any overlapped LDIR tricks so shouldn't
        be affected.
 
+       The interrupt flags are misemulated. A patch for this is in the
+       Fuzix tree and is needed to run Fuzix on xtrs/sdltrs
+
 Requirements: 
        128K RAM fitted
        Hard disk drive (will be used for swap), or a suitable memory
        expander board could be used with a bit of tweaking (or both!)
-       *** NOTE: the current code will simply swap blindly all over the first
-       hard disk ***
+       (The hard disk code should work with the Lo-tech IDE adapter but
+       this has yet to be confirmed)
 
 Memory Map:
        Base memory 0-FFFF (with a fair bit of slack) is used for the kernel
@@ -42,7 +45,7 @@ Drivers:
        Floppy and Hard disk are done and minimally tested
        Floppy drivers do not yet deal with double sided disks or sd/dd
        media detection
-       Hard disk needs to read block 0, and handle partitions of some form
+       Hard disk reads block 0, and handle partitions of some form
        including finding where 'swap' lives
 
 Adding Support For Other Banked RAM:
@@ -91,3 +94,32 @@ To set up for hard disk, create a hard disk with the xtrs tools and
 
 You will still need a boot floppy at this point but just boot with device
 0 (or hit return). Swap is configured to be on the end of the hard disk
+
+
+
+Banking Models
+
+Currently Supported:
+       TRS80 model 4 with inbuilt memory bank switching
+
+In Progress:
+       Port 0x94 modification to add extra internal RAM to a 4 and 4P
+
+Not Yet Started:
+       "Selector" for Model 1. Port 31 allows memory reshuffling away from
+the model 1 default. Either the upper or lower 32K is switchable but not
+both at once. bits 4/5 control the selection between a further 4 32K banks.
+Also needs model 1 support adding of course.
+
+
+Documentation Needed:
+       Various other RAM banking boards (AlphaTech and the like)
+
+       HD64180 mods with more RAM (these are I suspect almost a different port)
+       (XLR8R etc)
+
+Not Usable:
+       Various model 1 interfaces that provide 64K RAM or near 64K RAM. Not
+enough for Fuzix on Z80. Possibly enough for UZI with a hard disc.
+
+       LNW80 model II (same problem - 64K only)