I only have 4 boards with a 6502 cbm 8032 SYM 1 MICRO KIM REPLICA 1 same result on cbm and sym, I'll try on the micro kim and replica 1 note: the replica 1 has an instability and crash often (seems due to the propeller) I'll try on these 2 boards On 06/11/2016 15:13, Gerrit Heitsch wrote: > On 11/05/2016 09:37 PM, didier derny wrote: >> while checking some signals on the 6502 of my 8032 motherboard >> I found the 'high' level rather low 2.5v (I expected around 4v...) >> >> so I took my SYM1 board and tested several 6502 >> MOS 6502 around 4v >> Rockwell 6502 around 4v >> Rockwell 65c02 around 5v >> Synertek 6502 around 2.5v >> CM630 around 4v (bulgarian clone) >> >> I tried several 6502 of each type... > > Since I was curious and able to test it... A few years ago I built > myself a replica of the EMUF232 on a perfboard (was a real pain in > the...). That's a 6502 system with 2 x 6522, 1 6551, 32KB RAM running > at 1.8432 MHz. As a CPU I used a SY6502A, datecode 8047. > > When checking the address lines on the scope today, the CPU produces a > HIGH of 3.5-3.7V. So it can't be Synertek in general unless the > drivers are less powerful than Rockwell and MOS and your board has > more load on the lines. If possible, check the SY6502 in another > board, maybe a 1541. > > Gerrit > > > > > > > > > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2016-11-06 16:00:02
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