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beta128: patch some TR-DOS bug so Pentagon and Scorpion works ok with FDD until wd_fdc cant handle this (nw)

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This commit is contained in:
MetalliC 2015-05-28 15:49:30 +03:00
parent d822c8af2b
commit dde3e0c50d
3 changed files with 10 additions and 4 deletions
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2
src/mess/drivers/scorpion.c
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@ -322,6 +322,8 @@ ROM_START(scorpio)
ROMX_LOAD("scorp2.rom", 0x018000, 0x4000, CRC(fd0d3ce1) SHA1(07783ee295274d8ff15d935bfd787c8ac1d54900), ROM_BIOS(7))
ROMX_LOAD("scorp3.rom", 0x01c000, 0x4000, CRC(1fe1d003) SHA1(33703e97cc93b7edfcc0334b64233cf81b7930db), ROM_BIOS(7))
ROM_FILL( 0x1fe47, 1, 0x3e) // patch TR-DOS bug
ROM_REGION(0x01000, "keyboard", 0)
ROM_LOAD( "scrpkey.rom", 0x0000, 0x1000, CRC(e938a510) SHA1(2753993c97ff0fc6cff26ed792929abc1288dc6f))

10
src/mess/machine/beta.c
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@ -1,5 +1,5 @@
// license:BSD-3-Clause
// copyright-holders:Curt Coder
// copyright-holders:Curt Coder, MetalliC
/*********************************************************************
beta.h
@ -11,8 +11,7 @@
*********************************************************************/
/*
BUGS:
- random commands can be sent to FDC, so better keep .trd images write protected for now
goto TR-DOS, CAT -> files will be shown, CAT again -> NO DISK mesage as result of trash commands
- due to original firmware bug random commands can be sent to FDC instead of SEEK, current WD FDC emulation cant handle this correctly, use patch fix for now
*/
#include "emu.h"
@ -269,6 +268,11 @@ ROM_START( beta_disk )
//Default for now
ROM_LOAD( "trd503.rom", 0x00000, 0x4000, CRC(10751aba) SHA1(21695e3f2a8f796386ce66eea8a246b0ac44810c))
// TR-DOS rom have a bug - semi-random commands sent to FDC instead of SEEK command sometimes
// however it works OK on real hardware but does not using our WD FDC emulation, both legacy and modern
// this patch fixes original bug
ROM_FILL( 0x3e47, 1, 0x3e)
ROM_END

2
src/mess/machine/beta.h
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@ -1,5 +1,5 @@
// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
// copyright-holders:Miodrag Milanovic, MetalliC
/*********************************************************************
beta.h