Rename RAMSTART to SYSVARS

It's more descriptive this way. Also, I'll soon add a new HERESTART
config.

blk/080

@@ -2,15 +2,15 @@ System variables
 
 There are some core variables in the core system that are
 referred to directly by their address in memory throughout the
-code. The place where they live is configurable by the RAMSTART
-constant in conf.fs, but their relative offset is not. In fact,
-they're mostly referred to directly as their numerical offset
-along with a comment indicating what this offset refers to.
+code. The place where they live is configurable by the SYSVARS
+constant in xcomp unit, but their relative offset is not. In
+fact, they're mostly referred to directly as their numerical
+offset along with a comment indicating what this offset refers
+to.
 
 This system is a bit fragile because every time we change those
 offsets, we have to be careful to adjust all system variables
 offsets, but thankfully, there aren't many system variables.
 Here's a list of them:
 
-
                                                         (cont.)

blk/081

@@ -1,4 +1,4 @@
-RAMSTART  FUTURE USES          +3c       BLK(*
+SYSVARS   FUTURE USES          +3c       BLK(*
 +02       CURRENT              +3e       A@*
 +04       HERE                 +40       A!*
 +06       C<?                  +42       FUTURE USES
@@ -6,8 +6,8 @@ RAMSTART  FUTURE USES          +3c       BLK(*
 +0a       NLPTR                +53       (emit) override
 +0c       C<*                  +55       (key) override
 +0e       WORDBUF              +57       FUTURE USES
-+2e       BOOT C< PTR          
-+30       IN>                 
++2e       BOOT C< PTR
++30       IN>
 +32       IN(*                 +70       DRIVERS
 +34       BLK@*                +80       RAMEND
 +36       BLK!*

blk/089

@@ -4,7 +4,7 @@ On boot, we jump to the "main" routine in B289 which does
 very few things.
 
 1. Set SP to PS_ADDR and IX to RS_ADDR
-2. Sets HERE to RAMEND (RAMSTART+0x80).
+2. Sets HERE to SYSVARS+0x80.
 3. Sets CURRENT to value of LATEST field in stable ABI.
 4. Execute the word referred to by 0x04 (BOOT) in stable ABI.
 

blk/280

@@ -4,8 +4,8 @@ This assembles the boot binary. It requires the Z80 assembler
 (B200) and cross compilation setup (B260). It also requires
 these constants to be set:
 
-RAMSTART: beginning address of RAM. This is where system
-variables are placed. HERE is then placed at RAM+80 (ref B80).
+SYSVARS: This is where system variables are placed. HERE is
+then placed at SYSVARS+0x80 (ref B80).
 
 RS_ADDR: to be set to the bottom address of the Return Stack.
 

blk/299

@@ -2,12 +2,12 @@ PC ORG @ 1 + ! ( main )
 ( STACK OVERFLOW PROTECTION: See B76 )
     SP PS_ADDR LDdn, IX RS_ADDR LDdn,
 ( HERE begins at RAMEND )
-    HL RAMSTART 0x80 + LDdn,
-    RAMSTART 0x04 + LD(n)HL, ( RAM+04 == HERE )
+    HL SYSVARS 0x80 + LDdn,
+    SYSVARS 0x04 + LD(n)HL, ( RAM+04 == HERE )
 ( LATEST is a label to the latest entry of the dict. It is
   written at offset 0x08 by the process or person building
   Forth. )
     BIN( @ 0x08 + LDHL(n),
-    RAMSTART 0x02 ( CURRENT ) + LD(n)HL,
+    SYSVARS 0x02 ( CURRENT ) + LD(n)HL,
     DE BIN( @ 0x04 ( BOOT ) + LDdd(n),
     JR, L1 FWR ( execute, B301 )

blk/353

@@ -1,4 +1,4 @@
-: RAM+ [ RAMSTART LITN ] + ; : BIN+ [ BIN( @ LITN ] + ;
+: RAM+ [ SYSVARS LITN ] + ; : BIN+ [ BIN( @ LITN ] + ;
 : HERE 0x04 RAM+ ;
 : CURRENT* 0x51 RAM+ ; : CURRENT CURRENT* @ ;
 : H@ HERE @ ;

blk/425

@@ -1,5 +1,5 @@
 anatomy. First, we have constants. Some of them are device-
-specific, but some of them are always there. RAMSTART is the
+specific, but some of them are always there. SYSVARS is the
 address at which the RAM starts on the system. System variables
 will go there and HERE will go after it.
 

blk/582

@@ -2,7 +2,7 @@
 0x81 CONSTANT ACIA_IO ( IO port for ACIA's data registers )
 ( Address in memory that can be used variables shared
   with ACIA's native words. 8 bytes used. )
-CREATE ACIA_MEM RAMSTART 0x70 + ,
+CREATE ACIA_MEM SYSVARS 0x70 + ,
 ( Points to ACIA buf )
 : ACIA( ACIA_MEM @ 4 + ;
 ( Points to ACIA buf end )

blk/618

@@ -1,4 +1,4 @@
-0x8000 CONSTANT RAMSTART
+0x8000 CONSTANT SYSVARS
 0xff00 CONSTANT RS_ADDR        0xfffa CONSTANT PS_ADDR
 4      CONSTANT SDC_SPI
 5      CONSTANT SDC_CSLOW      6      CONSTANT SDC_CSHIGH

blk/812

@@ -3,7 +3,7 @@ PC 3 - ORG @ 1+ ! ( main )
     SP PS_ADDR MOVxI, BP RS_ADDR MOVxI,
     DI 0x08 MOVxm, ( LATEST )
 ( HERE begins at CURRENT )
-    RAMSTART 0x4 ( HERE ) + DI MOVmx,
-    RAMSTART 0x2 ( CURRENT ) + DI MOVmx,
+    SYSVARS 0x4 ( HERE ) + DI MOVmx,
+    SYSVARS 0x2 ( CURRENT ) + DI MOVmx,
     DI 0x04 ( BOOT ) MOVxm,
     JMPn, lblexec @ RPCn, ( execute )

blk/842

@@ -1,6 +1,6 @@
 0xff00 CONSTANT RS_ADDR
 0xfffa CONSTANT PS_ADDR
-RS_ADDR 0x80 - CONSTANT RAMSTART
+RS_ADDR 0x80 - CONSTANT SYSVARS
 750 LOAD  ( 8086 asm )
 262 LOAD  ( xcomp ) 270 LOAD  ( xcomp overrides )
 805 820 LOADR

cvm/xcomp.fs

@@ -1,4 +1,4 @@
-0xe800 CONSTANT RAMSTART
+0xe800 CONSTANT SYSVARS
 0xff00 CONSTANT RS_ADDR
 0xfffa CONSTANT PS_ADDR
 : CODE ( natidx -- ) (entry) 0 C, C, ;

emul/xcomp.fs

@@ -1,4 +1,4 @@
-0xe800 CONSTANT RAMSTART
+0xe800 CONSTANT SYSVARS
 0xff00 CONSTANT RS_ADDR
 0xfffa CONSTANT PS_ADDR
 212 LOAD  ( z80 assembler )

recipes/rc2014/ps2/README.md

@@ -68,7 +68,7 @@ First, we need a `(ps2kc)` routine. In this case, it's easy, it's
 `: (ps2kc) 8 PC@ ;`. Add this after ACIA loading. Then, we can load PS/2
 subsystem. You add `411 414 LOADR`. Then, at initialization, you add `PS2$`
 after `ACIA$`. You also need to define `PS2_MEM` at the top. You can probably
-use `RAMSTART + 0x7a`.
+use `SYSVARS + 0x7a`.
 
 Rebuild, reflash, should work. For debugging purposes, you might not want to
 go straight to plugging PS/2 `(key)` into the system. What I did myself was

recipes/sms/kbd/README.md

@@ -104,7 +104,7 @@ to TH (and also the A/B on the '157). Q is hooked to PB0 and TL.
 
 We start with the base recipe and add a few things:
 
-1. at the top: `RAMSTART 0x72 + CONSTANT PS2_MEM`
+1. at the top: `SYSVARS 0x72 + CONSTANT PS2_MEM`
 2. After VDP load: `641 LOAD : (ps2kc) (ps2kcB) ;` (that binds us to port B)
 3. Right after: `411 414 LOADR` (that gives us `(key)`)
 4. After `VDP$`: `PS2$`.

recipes/sms/xcomp.fs

@@ -1,14 +1,14 @@
 ( 8K of onboard RAM )
-0xc000 CONSTANT RAMSTART
+0xc000 CONSTANT SYSVARS
 0xdd00 CONSTANT RS_ADDR
 ( Memory register at the end of RAM. Must not overwrite )
 0xddca CONSTANT PS_ADDR
-RAMSTART 0x70 + CONSTANT VDP_MEM
+SYSVARS 0x70 + CONSTANT VDP_MEM
 0xbf   CONSTANT VDP_CTLPORT
 0xbe   CONSTANT VDP_DATAPORT
 32     CONSTANT VDP_COLS
 24     CONSTANT VDP_ROWS
-RAMSTART 0x72 + CONSTANT PAD_MEM
+SYSVARS 0x72 + CONSTANT PAD_MEM
 0x3f   CONSTANT PAD_CTLPORT
 0xdc   CONSTANT PAD_D1PORT
 212 LOAD  ( z80 assembler )

recipes/ti84/xcomp.fs

@@ -1,8 +1,8 @@
-0x8000 CONSTANT RAMSTART
+0x8000 CONSTANT SYSVARS
 0xbf00 CONSTANT RS_ADDR
 0xbffa CONSTANT PS_ADDR
-RAMSTART 0x70 + CONSTANT LCD_MEM
-RAMSTART 0x72 + CONSTANT KBD_MEM
+SYSVARS 0x70 + CONSTANT LCD_MEM
+SYSVARS 0x72 + CONSTANT KBD_MEM
 0x01 CONSTANT KBD_PORT
 212 LOAD  ( z80 assembler )
 : ZFILL, ( u ) 0 DO 0 A, LOOP ;

recipes/trs80/xcomp.fs

@@ -1,6 +1,6 @@
 0xff00 CONSTANT RS_ADDR
 0xfffa CONSTANT PS_ADDR
-RS_ADDR 0x80 - CONSTANT RAMSTART
+RS_ADDR 0x80 - CONSTANT SYSVARS
 212 LOAD ( z80 assembler )
 262 LOAD ( xcomp )
 282 LOAD ( boot.z80.decl )

recipes/z80mbc2/xcomp.fs

@@ -1,5 +1,5 @@
 0xff00 CONSTANT RS_ADDR        0xfffa CONSTANT PS_ADDR
-RS_ADDR 0x80 - CONSTANT RAMSTART
+RS_ADDR 0x80 - CONSTANT SYSVARS
 212 LOAD  ( z80 assembler )
 262 LOAD  ( xcomp )
 282 LOAD  ( boot.z80.decl )