Clarify number representations

- relative addresses are signed
 - byte-order is big endian (#abcd = #ab #cd)

Also fixes a misspelling.
This commit is contained in:
~d6 2024-09-20 21:29:43 -04:00
parent 9530e7b13a
commit 126efb84f4
1 changed files with 4 additions and 2 deletions
doc/man

View File

@ -3,7 +3,7 @@
.\" Contact d_m@plastic-idolatry.com to correct errors or typos.
.TH uxntal 7 "05 Aug 2024" "1.0" "Uxntal Reference Guide"
.SH NAME
uxntal \- assembly langauge for Varvara virtual machine
uxntal \- assembly language for Varvara virtual machine
.SH DESCRIPTION
Uxntal is an 8-bit instruction set for programming the Varvara virtual machine.
It uses the lower 5-bits to specify an opcode, and the upper 3-bits to specify
@ -15,7 +15,9 @@ Instructions manipulate data using two stacks: a working stack (\fBwst\fP) and a
There are also 256 bytes of device memory, which are used to interact with the virtual machine and its devices.
Instructions deal with unsigned 8-bit values (\fIbytes\fP) and unsigned 16-bit values (\fIshorts\fP). There are no other built-in data types.
Instructions deal with unsigned 8-bit values (\fIbytes\fP) and unsigned 16-bit values (\fIshorts\fP). There are no other built-in data types. Occasionally values are treated as signed, such as when loading, storing, or jumping with a relative address.
Short values are stored on the stack in big-endian byte order: the least significant byte will be on the top of the stack. This makes \fB#abcd\fB is equivalent to \fB#ab #cd\fB.
.SH INSTRUCTION LAYOUT