Yes, that's generally correct. I made a screen dimension test program on the PCE and had this to say in the readme:
Quote:
Here are the maximum resolutions that I can get on my PC-Engine system and video monitor:
Low resolution (5Mhz clock): 282 x 242
Regs: $02,$00,$23,$0A,$00,$0E,$00F1,$03
Med. resolution (7Mhz clock): 377 x 242
Regs: $03,$02,$2F,$07 (rest are the same)
High resolution (10Mhz clock): 565 x 242
Regs: $00,$08,$46,$04 (rest are the same)
My TV (Panasonic, NTSC) has much less horizontal overscan visible (the usual 256 at the 5Mhz
clock), but the full 242 lines are visible all the same.
The majority (90%) of games on the PCE run at 256x239 lines of resolution, although some standouts do more (R-Type, Sherlock Holmes) or less (1941, Dragon's Curse.)
The display hardware of the PCE can also be coerced to do interlacing, though unlike the SNES and MD, not all TVs accept this signal.