From c5d745608e2db504b243acb07511d6c4e9ff0786 Mon Sep 17 00:00:00 2001 From: Izaya Date: Mon, 13 Mar 2017 17:36:11 +1100 Subject: [PATCH] README formatting --- README.md | 34 +++++++++++++++++----------------- 1 file changed, 17 insertions(+), 17 deletions(-) diff --git a/README.md b/README.md index 5e8cab7..9a4c7ac 100644 --- a/README.md +++ b/README.md @@ -13,23 +13,23 @@ The T400 is an 8-bit stack machine operating at 1Hz (due to ABMs only running on ### Instructions Any words encountered that aren't instructions are pushed to the stack. This makes very compact simple program code. -| ins | function | mnemonic | -|--------|----------------------------------------------|---------------| -| 255 | push program counter | ppc | -| 254 | swap TOS | swp | -| 253 | read memory from TOS | read | -| 252 | write to memory from TOS | write | -| 251 | add TOS | add | -| 250 | suptract TOS | sub | -| 249 | jump to TOS | jmp | -| 248 | skip if TOS = zero | sez | -| 247 | jump if TOS = zero | jez | -| 246 | jump to subroutine, push pc to retstack | jsr | -| 245 | return from subroutine, PC = top of retstack | ret | -| 244 | duplicate TOS | dup | -| 243 | drop TOS | drop | -| 242 | halt processor | hlt | -| 241 | pre-read address at TOS | prd | +| ins | function | mnemonic | +|-------|-----------------------------------------------|---------------| +| 255 | push program counter | ppc | +| 254 | swap TOS | swp | +| 253 | read memory from TOS | read | +| 252 | write to memory from TOS | write | +| 251 | add TOS | add | +| 250 | suptract TOS | sub | +| 249 | jump to TOS | jmp | +| 248 | skip if TOS = zero | sez | +| 247 | jump if TOS = zero | jez | +| 246 | jump to subroutine, push pc to retstack | jsr | +| 245 | return from subroutine, PC = top of retstack | ret | +| 244 | duplicate TOS | dup | +| 243 | drop TOS | drop | +| 242 | halt processor | hlt | +| 241 | pre-read address at TOS | prd | ### I/O The T408 uses memory-mapped I/O. This may seem like a stupid idea on a machine with 8-bit addressing but port-based I/O isn't hugely sane.