From 54c7f3028ea6a28805d1e653bf2182d879ee77ad Mon Sep 17 00:00:00 2001 From: MetalliC <0vetal0@gmail.com> Date: Sun, 7 Jun 2020 23:02:14 +0300 Subject: beta128.cpp start documenting clone firmwares (nw) --- src/devices/bus/spectrum/beta128.cpp | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/devices/bus/spectrum/beta128.cpp b/src/devices/bus/spectrum/beta128.cpp index e528fbc8154..3cc8caf69d9 100644 --- a/src/devices/bus/spectrum/beta128.cpp +++ b/src/devices/bus/spectrum/beta128.cpp @@ -77,10 +77,17 @@ FLOPPY_FORMATS_END ROM_START(beta128) ROM_REGION(0x4000, "rom", 0) ROM_DEFAULT_BIOS("trd503") + + // original ROM_SYSTEM_BIOS(0, "trd501", "TR-DOS v5.01") ROMX_LOAD("trd501.rom", 0x0000, 0x4000, CRC(3e3cdd4c) SHA1(8303ba0cc79daa6c04cd1e6ce27e8b6886a3f0de), ROM_BIOS(0)) ROM_SYSTEM_BIOS(1, "trd503", "TR-DOS v5.03") ROMX_LOAD("trd503.rom", 0x0000, 0x4000, CRC(10751aba) SHA1(21695e3f2a8f796386ce66eea8a246b0ac44810c), ROM_BIOS(1)) + + // clone/homebrew modifications based on original v5.03 + ROM_SYSTEM_BIOS(2, "trd504t", "TR-DOS v5.04T (hack)") + // increased step rate (6ms), FORMAT command got interleave 1:1 option for faster read/write speed, this firmware was most common at post-soviet space in 90x. + ROMX_LOAD("trd504t.rom", 0x0000, 0x4000, CRC(e212d1e0) SHA1(745e9caf576e64a5386ad845256d28593d34cc40), ROM_BIOS(2)) // trd504.rom CRC ba310874 is bad dump of 5.03 with edited version text, no actual code changes. ROM_END -- cgit v1.2.3