The 252535-01 works correctly as 251715-01 in pre Rev.B boards since Pin 18 (IIRC) signals the 252535-01 to disable internal Color RAM and enable /CS for Color RAM on the needed pin. Am 18.10.23 um 15:55 schrieb Pasi Lassila: > On Mon, 16 Oct 2023 at 21:27, Gerrit Heitsch > <gerrit_at_laosinh.s.bawue.de> wrote: > > On 10/16/23 20:10, Jim Brain wrote: > > On 10/16/2023 12:51 PM, Gerrit Heitsch wrote: > >> On 10/16/23 19:28, didier_at_aida.org wrote: > >>> I 'll try to find a spare PLA, Video chip and SID... > >> > >> There are 2 different kinds of the 64pin PLA: > >> > >> 251715-01 PLA C64C (64pin) > >> 252535-01 PLA C64C (64pin, integ. Color RAM) > >> > >> The first one is easier to find, but doesn't fit your board. > >> > >> But they are both CMOS, stay cool and hardly ever go bad. > > > > Can you use the Color RAM version in the non COlor RAM needed > board, if > > that makes sense? > > Never tried it since I never had one go bad. Maybe because they > were not > made by MOS but by well known semicondutor makers like SHARP or > YAMAHA > (*). Also when looking around, I found the version without color RAM > easier to find. > > (*) The part numbers besides the Commodore part numbers gave that > away: > YM3535 and LH5062B on my 251715-01 and on a 252535-01 SHARP even > printed > their logo. > > Gerrit > > > Pinout looks the same except pin 17 is used for external colour RAM > chip select signal. > > -PasiReceived on 2023-10-18 18:00:08
Archive generated by hypermail 2.3.0.