-The MTX512 has the following relevant features
-
-- "FDX" WD1791 floppy (and an actual DMA controller) at 0x40
- SASI interface for floppies
- (Not in emulator)
-- "SDX" WD1791 style floppy (and no DMA controller) at 0x10
-- 9918/29 VDP graphics (equivalent to MSX1 but on ports 1/2) - interrupts
- are fed to the CTC however
-- Separate 80 column card (text mode only) (6845 on port 0x38/39)
- this has its own memory port poked via port 30,31 (set 31
- bits 2-0 to the high address bits, bit 5 for attr, 6 for ascii, 7 for write
- then port 30 for the low bits. Port 32 is the data port (read after write
- before), port 33 for read/write is the attribute byte
-- "silicon disc" (aka RAM discs) on 0x50-53 54-57 58-5b 5c-5f
-- CTC timer (at CPU speed so can support single step)
-- RS232 (Z80 DART)
-- Sound (SN76489A) on I/O port 6, (strobe on port 3, 32uS reqired post
- strobe)
+The following MTX512 features are supported
+- 6845 based colour text display attributes yet) as /dev/tty1
+- Keyboard including F1/F2 to switch tty
+- SDX WD1791 style floppy controller at 0x10
+- Silicon discs. These are mapped as device 8 not as /dev/hd because their
+ contents (on real ones) vanish if you power off. The default build will
+ blindly use the first silicon disc as swap
+- CTC timers
+- Z80 DART RS232
+- Printer
+
+The following are not yet supported
+- Colour/attributes on the display (general vt change)
+- VDP based graphics display (equivalent to MSX1 but on ports 1 and 2) with
+ interrupts fed into CTC#0 as /dev/tty2. This is partly implemented but
+ scrolling has yet to be debugged!
+- FDX SASI DMA controller
+- SN76489A sound (no sound layer in Fuzix yet)
+
+The Rememorizer and Rememotech are not supported. Adding support for them
+should not be difficult.
+
+
+Memory Management
Memory is split into four banks the decode for which is dependent upon
whether the box is in "ROM based" or "RAM based" mode. The memory is then
All memory management is controlled by the page port (port 0). Bit 7 is set
to 1 to turn the ROMs off, bit 4-6 detemine the rom page address, bits 0-3
-select the RAM bank.
+select the RAM bank. The port is *write only*.
Note that Rememorizer is different, it allows 0x0f to be written to the
low 3 bits of port 0, then port 0xd2, d0, d1 control the 3 16K banks and also
-has an SD card. Not supported, if you want it supported fix MEMU ;-)
+has an SD card. Under Rememorizer you could instead do a 16K banked port and
+get better performance and memory usage.
+Loading
On the MEMU emulator you can do a fast load for testing as follows