messroms.txt
------------

information about
* messroms utility
* dumping roms
* saving roms
* transfering data to pc

files
-----
main.c, roms.h, comp.h messroms tool
dumppc.c, dumppc.txt, dumppc.exe msdos utility for dumping pc rom area 
 (also binary, because with djgpp you can't create a 8086 based pure msdos utility)
dumpat.c, dumpat.txt, dumpat.exe msdos utility for dumping at boot area
read6530.c contains the info for dumping mos rriot 6530
rddil24.c contains the info for dumping mos rom6332 or similar 24 pin roms
read6332.c contains the info for dumping mos rom 6332
rddil32.c this is more a bugfix for my eprommer software

cbm.txt info for dumping, saving, transfering commodore computers and devices
c64savec.prg program to copy c64 character to basic area for later saving

svision.txt info for building an adapter for supervision cartridge to
			27c4001 eprom pinout
pc1500.txt pinout of sharp pc1500/pc1500a/trs80pc2 rom
tc.txt pinout of TC531000 (128k x 8 rom) TC571001 (128k x 8 eprom)

cvhp48.c conversion utility for hp48 ascii/romdump dumps into binary

messroms utility
----------------

motivation: help identifying already known roms, bad dumps,
and give info to convert roms into the needed format.

messroms --0x0000000 
 identify crc 
messroms directory
 identifies files in directory
messroms zipfile.zip
 identifies files in zip archiv


dumping roms
------------

most roms are dumped with eprom burners.
There are many variations of eprom burners outside,
each supported a large range of eprom chip types.

I will give only a few tips for special chips:

Always use the romcmp utility to identify bad dumps.
Dump several times, and compare if the dumped data is the same.

Weak dumps: had different dumps with watara supervision cartridges
 when oe, ce was not switched when reading

MOS6332: rom 4 kbyte 8bit, DIL 24 package
 for pinout look into mess/messroms/read6332.c
 to allow dumping as 2732 build an adapter exchanging pin 18 and 20
 
Signetics C19081, C19082 (24 pin dil) look into rd24dil.c

EPROM DIL 32 PIN:
 dumping as 278001 should be save

rom/eprom in epoxy:
 often you can see the wire into the epoxy.
 These are in the same ordering as the pinout of the chip
 (helped finding out watara super vision cartridge pinout)

soldered roms/eproms, and you can't or want unsolder them:
 wire an adapter with 2 sockets 
 (a cheap one to place on top of the eprom, and another one for the eprommer)
 cut 1 of the power lines with a sharp knife
 solder socket on 2 points over the eprom for mechanical stability
 now you should be able to read it out
 unsolder the piggyback socket
 reconnect the cut pin

MOS6530: rom, ram, input, output timer
 difficult to read
 look into mess/messroms/read6530.c
 maybe you can wire an adapter for an eprommer and read it as 27128 (a0 simulating clock)
 you have to identify the rom, ram, io area in the usually 8kbyte dumped data
 ram 64 bytes 0xff, io 16 bytes misc data, rom 1kbyte, 
 unused depends on your hardware in mine 0

PIC1655
 info at www.microchip.com: technical reference manual and programming reference manual
 available

 could be protected (you read protected data, with info lost)
 reading of mask programmed chips?
 PIC16C55 and PIC1655(NMOS) differences?

SC61860: Sharp Pocket Computer internal rom of the cpu
 not known if it is accessible on the pinout

TC531000 (128k x 8 mask rom)
 look into mess/messroms/tc.txt

TC571001 (128k x 8 eprom )
 look into mess/messroms/tc.txt

Sharp PC1500, PC1500A
Tandy TRS80 PC-2
----------------
 look into mess/messroms/pc1500.txt for rom pinout

RCA Studio 2 and cartridges
 look at Paul Robson's Studio2 page at www.classicgaming.com/studio2

Watara Supervision Cartridges
 look into mess/messroms/svision.txt for building an adapter

Saving roms
-----------

Some dump roms with the help of rom sockets in computer.
E.g. pc network adapter to plug in an 8kbyte rom in its bootrom socket
and read it.

Sometimes it is not possible to get the single chips for reading.
* you may not or can not open the appliances
* roms are soldered directly into the board and you cannot unsolder them
* roms are in a smd package with very small place between pins
....

Many roms are complete visible to cpu. So you can read them out with programs.

IBMPC
-----
most bios, graphics, harddisk, ethernet bootroms are complete visible.
Character roms in pre EGA graphics adapters are not visible.
Flash roms of modern pcs not complete in the small 256 kbyte PC realmode area.
Some special roms (deskmate of tandy1000) are not visible in the small 256kbyte area.

You can used msdos debug, or any other debugger to save there roms:
c0000-c7fff typical EGA,VGA
c8000-c9fff typical PC harddisk controller
f6000-fdfff BASIC
fe000-fffff PC bios
f0000-fffff bigger bios

In dumppc.zip you find a msdos utility dumping the complete c0000-fffff area.

IBMAT
-----
This saves the boot area of intel 386 compatibles at's
(0xfff00000-0xfffffffff)
Should work with intel 286 compable at's (0xf00000-0xffffff).
Hopefully works with those 286 based xt's and tandy's.

Sharp Pocket Computer
---------------------
look into src/cpu/sc61860/readpc.c
Internal rom only accessible in machine language

HP48S/SX/G/GX
-------------
In some emulators (x48) you can find instructions and a tool for 
transmitting the rom to a computer with 
rs232 (9600 8N1 with kermit? protocoll).
cvhp48.c converts this dump into a binary.

Transfering data to another computer
------------------------------------

?
