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Rename RAMSTART to SYSVARS

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It's more descriptive this way. Also, I'll soon add a new HERESTART
config.
This commit is contained in:
Virgil Dupras 2020-06-28 18:49:30 -04:00
parent 9424770caa
commit 3068b58be5
19 changed files with 33 additions and 33 deletions
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10
blk/080
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@ -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.)

6
blk/081
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@ -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!*

2
blk/089
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@ -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.

4
blk/280
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@ -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.

6
blk/299
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@ -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 )

2
blk/353
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@ -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 @ ;

2
blk/425
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@ -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.

2
blk/582
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@ -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 )

2
blk/618
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@ -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

4
blk/812
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@ -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 )

2
blk/842
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@ -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

2
cvm/xcomp.fs
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@ -1,4 +1,4 @@
0xe800 CONSTANT RAMSTART
0xe800 CONSTANT SYSVARS
0xff00 CONSTANT RS_ADDR
0xfffa CONSTANT PS_ADDR
: CODE ( natidx -- ) (entry) 0 C, C, ;

2
emul/xcomp.fs
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@ -1,4 +1,4 @@
0xe800 CONSTANT RAMSTART
0xe800 CONSTANT SYSVARS
0xff00 CONSTANT RS_ADDR
0xfffa CONSTANT PS_ADDR
212 LOAD ( z80 assembler )

2
recipes/rc2014/ps2/README.md
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@ -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

2
recipes/sms/kbd/README.md
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@ -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$`: `PS2$`.

6
recipes/sms/xcomp.fs
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@ -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 )

6
recipes/ti84/xcomp.fs
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@ -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 ;

2
recipes/trs80/xcomp.fs
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@ -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 )

2
recipes/z80mbc2/xcomp.fs
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@ -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 )