diff --git a/devices/common/viacuda.cpp b/devices/common/viacuda.cpp
index ea2cb8c..69232d1 100644
--- a/devices/common/viacuda.cpp
+++ b/devices/common/viacuda.cpp
@@ -356,7 +356,7 @@ void ViaCuda::write(uint8_t new_state) {
         schedule_sr_int(USECS_TO_NSECS(61));
     } else {
         if (this->via_regs[VIA_ACR] & 0x10) { /* data transfer: Host --> Cuda */
-            if (this->in_count < 16) {
+            if (this->in_count < sizeof(this->in_buf)) {
                 this->in_buf[this->in_count++] = this->via_regs[VIA_SR];
                 // tell the system we've read the byte after 71 usecs
                 schedule_sr_int(USECS_TO_NSECS(71));
diff --git a/devices/common/viacuda.h b/devices/common/viacuda.h
index 9945ddd..d76fede 100644
--- a/devices/common/viacuda.h
+++ b/devices/common/viacuda.h
@@ -140,6 +140,8 @@ enum {
     CUDA_ERR_I2C      = 5  /* invalid I2C data or no acknowledge */
 };
 
+#define CUDA_IN_BUF_SIZE    256
+
 /** PRAM addresses within Cuda's internal memory */
 #define CUDA_PRAM_START 0x100 // starting address of PRAM
 #define CUDA_PRAM_END   0x1FF // last byte of PRAM
@@ -195,7 +197,7 @@ private:
     uint8_t  old_tip;
     uint8_t  old_byteack;
     uint8_t  treq;
-    uint8_t  in_buf[16];
+    uint8_t  in_buf[CUDA_IN_BUF_SIZE];
     int32_t  in_count;
     uint8_t  out_buf[16];
     int32_t  out_count;