PX-4 PROM WRITER CARTRIDGE & ROMWRITE 2.0

ROMWRITE 2.0 has two major modes of operation;
- Normal PROM writer mode. To read, write, store, retrieve and modify 
  EPROM contents. 
- EPSON format PROM writer mode. To compose and write the Epson M and P
  format EPROMs.

Both formats support three EPROM types:
- 64k (2764)
- 128k (27128)
- 256k (27256)

Writing algorithm:
- Quick  (FUJITSU)
- Intelligent (INTEL)
- Standard

Vpp voltage selection:
- 12.5v
- 21v


EPSON format PROM writer mode.
Both the M (Maple) format and the P (Pine) format are supported.
The M format is just a file system on a EPROM. This format can be 
used in both the PX-8 and PX-4. 
The P format, only supported by the PX-4, uses the PROM memory
to execute a program directly. The PX-4 BASIC is an example.
Both M and P formats can span two EPROMS.
Spanned P type EPROMs have to be the same size. 

After selecting the files to be incorporated in the PROMs, the 
programs immediatly goes into EPROM writing mode.


Normal PROM writer mode.

The available commands are listed below:

A - Auto           (Blank check, Write PROM & Verify)
B - Blank check    
D - Display memory 
F - Fill memory    
L - Load file      (Load file into memory and Write PROM)
O - Output file    
R - Read PROM      
S - Set memory     
V - Verify         
W - Write PROM     


Explanation of the non-obvious commands:

D [<start_addr>, [<end_addr>]]
Displays memory in hex and ASCII. Default <start_addr> is 0000
or the value set bij Fill or Set memory.
Default <end_addr> is <start_addr> + 32.

F <start_addr>, <end_addr>, <value>
Fill memory from <start_addr> to <end_addr> with <value>

L <file_name>
Load binary file from disk and write it to PROM.

O <file_name> ,<start_addr>, <end_addr>
Write binary file to disk. Default <start_addr> is 0, default 
<end_addr> is PROM size.

S <start_addr>
Modify memory address.


During EPROM writing, the program cannot be interrupted other than by 
RESET.